Leased Line Modem Application Note

Issue Date 02/18/02

© 2002 Johnson Controls, Inc. www.johnsoncontrols.comCode No. LIT-6363141 Software Release 12.00

APPLICATION NOTE

Leased Line Modem

Leased Line Modem.............................................................................3

Introduction......................................................................................................... 3

Key Concepts...................................................................................................... 4

Application Details ...........................................................................................................4

Theory of Operation ........................................................................................................6

Components....................................................................................................................8

Planning Considerations................................................................................................10

Design Considerations ..................................................................................................10

Detailed Procedures......................................................................................... 12

Configuring the Modems ...............................................................................................12

Configuring the MultiModemV32L Unit ..........................................................................12

Configuring the MultiModemII (MT1432A) Unit..............................................................22

Configuring the MultiModemII (MT1932 and MT2834) Unit ...........................................32

Using Commissioning Procedures.................................................................................39

Installing the Modems....................................................................................................40

Using the Remote Printer Application............................................................................46

Using the Remote N2 Bus Application...........................................................................48

Troubleshooting Procedures .......................................................................... 54

Checking for a Defective Modem...................................................................................55

Checking Revision Level ...............................................................................................56

Modem Does Not Configure Properly ............................................................................56

Reference .......................................................................................................... 57

Modem Commands .......................................................................................................57

Modem Switch Settings .................................................................................................57

2 Leased Line Modem Application Note

Ordering Information........................................................................................ 58

Johnson Controls Code Numbers..................................................................................58

Vendor Code Numbers..................................................................................................58

Ordering a Leased Line.................................................................................................59

Leased Line Modem Application Note 3

Leased Line Modem

IntroductionThe Leased Line Modem applications allow the Metasys NetworkControl Module (NCM) to communicate with remote OperatorWorkstations (OWSs), printers, and N2 Bus devices over a pair ofleased line modems. These applications provide fast communicationover leased lines without the dialing and handshaking delays that arecharacteristic of dial-up communication. You can link a remote OWSlocated in a different building, send alarms to remote printers, andextend the N2 Bus to remote locations.


Key Concepts

Application Details

Remote Operator Workstation - allows you to have an OWS in anyremote location via the NCM’s RS-232 serial port or RS-232submodule port (Figure 1).

Remote Printer - allows you to have a printer in any remote locationvia the NCM’s RS-232 serial port or RS-232 submodule port(Figure 2).

Remote N2 Bus - allows you to extend the physical N2 Bus overleased lines to connect N2 devices (Figure 3 and Figure 4).

Figure 1 shows the Remote Operator Workstation application, inwhich a pair of modems enable communication between the NCM andan OWS over leased lines. The RS-232 connection at the NCM can beat the RS-232 serial port or the RS-232 submodule port.

Either NCM’s

RS-232 Serial Port

Leased Lines

Modem Modem

RS-232

OperatorWorkstation

or RS-232Submodule Port

2-Slot NCUOWSAPP

NCM

Note: For NCM300, modem connects to NCM's Port 2 (RS-232 port). For NCM350, modem can connect to Port 6 (with additional serial card). For details on available ports based on your configuration, see the

.Network

Control Module 300 Series Technical Bulletin (LIT-6360251)

Figure 1: Remote Operator Workstation Application


Figure 2 shows the Remote Printer application, in which a pair ofmodems enable communication between the NCM and a printer overleased lines. The RS-232 connection at the NCM can be at the RS-232serial port or the RS-232 submodule port.

2-Slot NCU

Printer

Either NCM'sRS-232 Serial Port

Leased Lines

Modem Modem

RS-232

or RS-232

Submodule Port

PRNTAPP

NCM

Note: For NCM300, modem connects to NCM's Port 2 (RS-232 port).

Figure 2: Remote Printer Application

Figure 3and Figure 4 show two variations of the Remote N2 Busapplication. The application in Figure 3 shows one RS-232-to-N2 Busconverter changing the N2 Bus signal to RS-232 levels, a pair ofmodems transmitting the signal over leased lines, and anotherconverter changing the Bus signal back to RS-485 levels. As shown,two sides of the N2 Bus may be wired at the converter on the NetworkControl Unit (NCU) side. Also note that you can use this applicationwith the NCM101/102, NCM401, NCM200, or NCM300.

Leased Lines

Modem

ConverterModel 485TBLED

To RemoteN2 BusDevices

RS-232

2-Slot NCU

TBC

Modem

N2 Bus

N2APP

N2 Bus Submodule(Required for NCM101/102/401)

NCM

To Local N2 Bus Devices or

Other Converters/Modems

For NCM300, N2 connection is made at its N2 terminal block,not at the Communications Terminal Board (TBC).

Note:

RS-232F R . G N D

S h ie ldT D (A )

T D (B )

R D (A )

T D (B )

G N D

+ 1 2V D C

O ff

O n

R T S

S D

E c ho C o nt ro l

RS-232 TO RS-485COM

ERTER (485TBLED

RS-232

FR. GND

Shield

TD(A)

TD(B)

RD(A)TD(B)

GND

+12VDC

OffOn

RTSSD

EchoControl

RS-2

32 T

O RS-4

85CO

MERT

ER (

485T

BLED

RS-2

32


Figure 3: Remote N2 Bus Application via N2 Bus Submoduleor Converter


Figure 4 shows an application in which the RS-232 submoduleinstalled in the NCM connects to a remote N2 Bus. A similarapplication can be used to extend the N2 Bus in the NCM300. TheNCM200 cannot extend the N2 Bus in this way. Also, the followingrestrictions apply:

• The N2 Bus cannot be wired at the Communication TerminalBoard (TBC) on the NCU (only at the RS-232 submodule).

• The NCU cannot contain any other modules (e.g., DCMs andXBNs) except the NCM.

Leased Lines

Modem Model 485TBLED

Converter

RS-232 Submodule

Modem

RS-232

2-Slot NCUN2APP2

NCM*

Devices

To RemoteN2 Bus

* NCM101/102/401 or NCM300 only.

F R . G N D

S h ie ld

T D (A )

T D (B )

R D (A )

T D (B )G N D

+ 1 2V D C

O ff

O n

R T S

S D

E c ho C o nt ro l

RS-232 TO RS-485

COMER

TER (485TBLED

RS-232RS-232

Figure 4: Remote N2 Bus Application via RS-232

Theory of Operation

The Leased Line Modem applications are fully compatible with andtransparent to Metasys functions and features. The applications applyonly to the NCM’s RS-232 serial port, NCM submodule ports, andN2 Bus; they cannot be applied to the N1 Local Area Network (LAN).

Two leased line modems were tested for these applications, both madeby Multi-Tech™ Systems, Inc.: the MultiModem V32L and theMultiModemII modems. Both modems are functionally the same,but the smaller MultiModemII unit replaces the discontinuedMultiModemV32L unit. Both modems are compatible with Hayes™products and feature error correction, data compression, and speedconversion. They provide the following functions:

• use leased line or dedicated wire. Dedicated wire is telephone wirethat is hard wired exclusively for the modems.

• communicate at various data rates up to 9600 bits per second (bps)for the MultiModemV32L unit and up to 28.8 kilobits per second(Kbps) for the MultiModemII unit depending on the NCMconfiguration.


• provide dialback protection over standard telephone lines, whichautomatically calls the dialback line when the leased line goesdown, then re-establishes communication over the leased line fromthe dialback line when the modem detects that the leased line isreconnected. The dialback feature is optional and is used onlywhen you specify both a dialback number and connect a telephoneline to the Dial Line connector.

• support 2- or 4-wire connections

• support dedicated wire distances up to 1 mile at 9600 baud and1/4-mile at 14,400 baud (longer for lower baud rates)

• support leased line wire distances up to the maximum that yourlocal telephone company provides

• use communication format V.32, a worldwide standard

This document uses the terms originate modem and answer modem.The originate modem initiates all telephone calls over the dialbackline. The answer modem answers all telephone calls placed to it by theoriginate modem.


Components

Table 1: Components of the Leased Line Modem Application

Component Description

N2 Bus Submodule Supplies RS-485 signals to the N2 Bus. TheNCM101/102/401 requires this submodule, while theNCM200 and NCM300 integrate the N2 interface.

RS-232 Submodule Provides a second RS-232 connection to the NCM.The NCM101/102/401/200 require this submodule,while the NCM300 does not.

Leased Line Modem Allows Metasys components to communicate over aleased line or standard telephone line. The leasedline modems that were tested are theMultiModemV32L unit and the MultiModemII unitfrom Multi-Tech Systems, Inc. Both modems includetelephone wire that can be used between the modemand the phone wall jack. For more details on thesemodems, refer to their respective owner’s manuals*.

RS-232-to-N2 Bus Converter Converts RS-232 signals to N2 Bus signals, and viceversa. Required because the N2 Bus uses RS-485and the modems use RS-232. The converter uses aseparate plug-in Class 2 transformer.

RS-232 Cables Serve as the communication medium betweenMetasys devices and the modems. Various cableconfigurations are needed depending on the device.

Leased Line Serves as the data line you rent from the localtelephone company over which the modemscommunicate. Its general specifications are listed inthe section Ordering a Leased Line.

Telephone Wire Serves as the communication medium between themodem and the telephone wall jacks, and betweentwo modems if you are using dedicated wire. Usestandard telephone wire, 24 AWG, either 2- or4-wire. Take special note of whether you use 2- or4-wire, since one switch setting on the modem variesaccordingly.

*Note: The MultiModemV32L unit and MultiModemII unit are loop-start compatible modems. They will notfunction on ground-start PBX systems.


Table 2 can help decide which components are required for yourapplication.

Table 2: Components Required

Leased Line Application Components Required

OWS or Printer (2) Leased Line Modems

(See Figure 2.) (2) RS-232 Cables

(1) RS-232 Submodule (not required if NCM’sRS-232 serial port is used)

Leased Line

Telephone Wire

N2 Bus (2) Leased Line Modems

(See Figure 3.) (2) RS-232 Cables

(2) RS-232-to-N2 Bus Converters

Power supply for each N2 Bus Converter

(1) N2 Bus Submodule (NCM101/102/401)*

Leased Line

Telephone Wire

N2 Bus with RS-232 (2) Leased Line Modems

NCM101/102/300* (2) RS-232 Cables

(See Figure 4.) (1) RS-232-to-N2 Bus Converter

Power supply for each N2 Bus Converter

(1) RS-232 Submodule**

Leased Line

Telephone Wire

* For information on NCM300, see the Network Control Module 300 SeriesTechnical Bulletin (LIT-6360251).

** Not required for NCM300.


Planning Considerations

Planning considerations for the Leased Line Modem applicationinclude space, environment, and power. The space requirements areincluded in Table 3.

Table 3: Space Requirements

Component Dimensions

MultiModemV32L Unit(W x H x D)

185 x 41 x 279 mm(7.28. x 1.61 x 10.98 in.)

Transformer for MultiModemV32L Unit(W x H x D)

64 x 102 x 70 mm(2.52 x 4.02 x 2.76 in.)

MultiModemII Unit(W x H x D)

156 x 35 x 229 mm(6.14 x 1.38 x 9.02 in.)

Transformer for MultiModemII Unit(W x H x D)

57 x 64 x 64 mm(2.24 x 2.52 x 2.52 in.)

RS-232-to-N2 Bus Converter(W x H x D)

55 x 19 x 86 mm(2.17 x 0.75 x 3.39 in.)

Power Supply for RS-232-to-N2 Bus Converter(W x H x D)

41 x 54 x 38 mm(1.61 x 2.13 x 1.50 in.)

Environment

The operating environment for the Leased Line Modem applicationcomponents must maintain temperatures within the range of 0 to 50°C(32 to 122°F) while maintaining relative humidity at a value of 10 to90% (non-condensing).

Power

The MultiModemV32L unit and the MultiModemII unit require anexternal power source of 115 VAC at 0.3 A (60 Hz) or 240 VAC at0.15 A (50 Hz). Connect the modem to a circuit that is free from heavyequipment and large induction motors.

The RS-232-to-N2 Bus Converter is powered with a transformer thatplugs into a 120 VAC wall outlet.

Design Considerations

Design considerations for the Leased Line Modem application includecable distances, leased line modem, and public carrier leased linecapability. The allowable distances for the dedicated wire are listed inTable 4. There is no distance limitation when using public carrierleased lines.


Table 4: Cable Distances

Modem Baud Rate Allowable Distance*

MultiModemV32L Unit 9600 1.6 km (1 mile)

MultiModemII Unit 9600 1.6 km to 4.8 km(1 to 3 miles)

14,400 0.4 km (1/4-mile)

* Longer distances are possible with lower baud rates and if the wire is not routednear noisy sources, such as fluorescent lights and power lines.

Leased Line Modem

The MultiModemV32L unit successfully passed application tests withMetasys Releases 2.02, 3.x, and 4.0. The MultiModemII (MT1432)unit successfully passed application tests with Metasys Release 4.0.The MultiModemII (MT2834) unit successfully passed applicationtests with Metasys Release 7.0. Other leased line modems may alsowork with these applications. Refer any quality or operation problemsof the modem to the manufacturer.

IMPORTANT: None of these modems was qualified perJohnson Controls environmental or noise qualitystandards, and are not guaranteed to work in otherapplications.

Public Carrier Leased Line Compatibility

The modems can be connected to 2-wire or 4-wire unconditionedprivate lines. The 4-wire application is more common. Refer to theOrdering a Leased Line section for general specifications.


Detailed Procedures

Configuring the Modems

To configure the MultiModemV32L unit or the MultiModemII unit,you need a dumb terminal, or a terminal program such as Windows®Terminal program or ProComm Plus program running on the OWS.Connect a straight-through cable between the modem and the terminalwhile configuring. Leave the modem’s jumper settings (inside) to thefactory default positions.

Configuring the MultiModemV32L Unit

Configuring the MultiModemV32L unit depends on which applicationyou are using: remote OWS, remote printer, or remote N2 Bus.

Using the Remote Operator Workstation Application

To configure the MultiModemV32L unit:

1. Set the terminal to the following to enable it to configure themodems:

9600 baud, 0 or no parity, 8 data bits, 1 stop bit, half duplex

2. Set the modem’s switches (located on the bottom) to the followingto enable it for configuration, using Table 5 and Table 6:

Table 5: 4-Position Switch Block

4-Position Switch Block Position

1 Down

2 Down

3 Down

4 Down


Table 6: 8-Position Switch Block


1 Up

2 Up (2-wire) or Down (4-wire)

3 Up

4 Down

5 Up

6 Up

7 Up

8 Down

3. Disconnect the leased line from the back of the modem, aftersetting the modem’s switches to enable it for programming.

4. Set the modems to 9600 baud, type the following commands,pressing Enter after each:

AT&W1&F <Enter>ATY1Q1 <Enter>AT&E1S18=255 <Enter>AT&BSE0&W0 <Enter>

If you want to set the modems to some other acceptable baud rate(300, 600, 1200, 2400, or 4800), type the following commands,specifying the baud rate in place of xxxx. Press Enter after eachcommand.

AT&W1&F <Enter>ATY1Q1 <Enter>AT&E1S18=255 <Enter>AT$BA0$SBxxxx <Enter>AT&BS0E0&W0 <Enter>

If the modem is not communicating properly, drop the baud rate to2400 by typing the following commands at the terminal andpressing Enter after each:

AT&W1&F <Enter>ATY1Q1 <Enter>AT&E1S18=255 <Enter>AT$BA0$SB2400 <Enter>AT$MB2400 <Enter>AT&BS0E0&W0 <Enter>


5. Cycle power on the modem. Type the following command andpress Enter:

ATL5

A list of parameters displays. Verify the following parameters arein the list:

E0, Q1, &E1, $MBxxxx, $SByyyy, $BAz, &W0

where:

xxxx and yyyy = baud rate selected

z = 1 for 9600 baud; 0 for any other baud rate

If any of these parameters are incorrect, check the switch settings,reenter the command in Step 4, and verify.

6. Type the following command and press Enter:

ATL7

Another parameter list displays. Verify that this list contains thefollowing parameters:

&BS0, Y1, $MBxxxx, $SByyyy, $BAz, &W0

where:

xxxx and yyyy and z = see Step 5

Again, if any of these parameters is incorrect, check the switchsettings, reenter the command in Step 4, and verify. Afterverifying that the modem is properly programmed, reconnect theleased line to the modem.


ATS18?

The response to this command should be 255. If not, reenter thecommand in Step 4 and verify.


8. (Optional)Specify the dialback number at the OWS’s modem(i.e., the originate modem) by typing the following command andpressing Enter, if you want to use the dialback feature:

For touchtone: ATDT<phone number>N9

For pulse: ATDP<phone number>N9

Examples:

ATDT555-1111N9 (sets 555-1111 as dialback number; usestone dial; stores number in Location 9)

ATDP9,555-1111N9 (opens outside line; sets 555-1111 asdialback number; uses tone dial; stores number in Location 9)

The 9, command in the second example opens an outside line (9)and pauses the modem for 2 seconds before it resumes dialing (,).


ATL

The phone number you entered should be listed under Register 9(N9). If the number is incorrect, reenter the command in Step 8and verify.

10. Change the switches to operational settings as follows to make theOWS modem the originate modem and the NCM (or JC/85Gateway NCM) modem the answer modem, after configuring theMultiModemV32L unit. Use Table 7 or Table 8 to determineswitch settings.

Table 7: 4-Position Switch Block for Originate/Answer Modems

Originate Modem(OWS Side; 4-Position Switch Block)

Answer Modem(NCM Side)

Switch Position Switch Position

1 Down 1 Down

2 Down 2 Down

3 Down 3 Down

4 Down 4 Down


Table 8: 8-Position Switch Block for Originate/Answer Modems

Originate Modem(OWS Side; 8-Position Switch Block)



1 Up 1 Up

2 Up (2-wire) orDown (4-wire)


3 Up 3 Up

4 Down 4 Down

5 Down 5 Up

6 Up 6 Up

7 Up 7 Up

8 Up 8 Up

The next step is to prepare the modem cables. Refer to Installing theModems, Using the Remote Operator Workstation Application section.

Using the Remote Printer Application



9600 baud, 0 or no parity, 8 data bits, 1stop bit, half duplex

2. Set the modem’s switches (located on the bottom) to the settingslisted in Table 9 or Table 10 to enable it for configuration:

Table 9: MultiModemV32L Unit 4-Position Switch Block


1 Down

2 Down

3 Down

4 Down


Table 10: MultiModemV32L Unit 8 Position Switch Block


1 Up


3 Up

4 Down

5 Up

6 Up

7 Up

8 Down


4. Set the modems to 9600 baud, type the following commands,pressing Enter after each:

AT&W1&F <Enter>AT&E5&E6Q1 <Enter>AT&E1 <Enter>ATS18=255E0&W0 <Enter>

If you want to set the modems to some other acceptable baud rate(1200, 2400, or 4800), type the following commands, specifyingthe baud rate in place of xxxx. Press Enter after each.

AT&W1&F <Enter>AT$BA0$SBxxxx <Enter>AT$MBxxxx&E5 <Enter>AT&E6Q1 <Enter>AT&E1S18=255E0&W0 <Enter>

These commands set certain defaults, enable error checking, andset Xon/Xoff. If the modem is not communicating properly, use abaud rate lower than 9600.


ATL5


E0, Q1, &E1, &E5, &E6, $MBxxxx, $SByyyy,$BAz, &W0

where:


z = 1 for 9600 baud; 0 for any other baud rate




ATS18?

The response to this command should be 255. If not, reenter thecommand in Step 4 and verify. After verifying that the modem isproperly programmed, reconnect the leased line to the modem.

7. (Optional)Specify the dialback number at the printer’s modem(i.e., the originate modem) by typing the following command andpressing Enter, if you want to use the dialback feature:



Examples:

ATDT9,555-1111N9 (opens outside line; sets 555-1111 asdialback number; uses tone dial; stores number in Location 9)

ATDP555-1111N9 (sets 555-1111 as dialback number; usespulse dial; stores number in Location 9)

The “9,” command in the first example opens an outside line (9)and pauses the modem for 2 seconds before it resumes dialing (,).


ATL


9. Change the switches to operational settings as shown in Table 11or Table 12 to make the printer modem the originate modem andthe NCM modem the answer modem, after configuring theMultiModemV32L unit.

Table 11: MultiModemV32L Unit 4-Position OperationalSettings

Originate Modem(Printer Side; 4-Position

Switch Block)



1 Down 1 Down

2 Down 2 Down

3 Down 3 Down

4 Down 4 Down


Table 12: MultiModemV32L Unit 8-Position OperationalSettings


Switch Block)



1 Up 1 Up

2 Up (2-wire) or Down(4-wire)


3 Up 3 Up

4 Down 4 Down

5 Down 5 Up

6 Up 6 Up

7 Up 7 Up

8 Up 8 Up

The next step is to prepare the modem cables. Refer to Using theRemote Printer Application section.

Using the Remote N2 Bus Application



9600 baud, 0 or no parity, 8 data bits,1 stop bit, half duplex

2. Set the modem’s switches (located on the bottom) to the followingto enable it for configuration (Refer to Table 13 and Table 14):

Table 13: MultiModemV32L Unit 4-Position ConfigurationSettings


1 Up

2 Down

3 Up

4 Down


Table 14: MultiModemV32L Unit 8-Position ConfigurationSettings


1 Down


3 Up

4 Down

5 Up

6 Down

7 Down

8 Down


4. Type the following commands at the terminal for each modem,pressing Enter after each:

AT&W1&F <Enter>ATY1Q1 <Enter>AT&E0S18=255 <Enter>AT$SB9600 <Enter>AT$BA0E0&W0 <Enter>

These commands disable error correction and set certain modemdefaults, such as 9600 baud.


ATL5


E0, Q1, &E0, $MB9600, $SB9600, $BA0, &W0



ATL7

Another parameter list displays. Verify that this list contains thefollowing parameters:

Y1, $MB9600, $SB9600, $BA0, &W0

If any of these parameters is incorrect, check the switch settings,reenter the command in Step 4, and verify. After verifying that themodem is properly programmed, reconnect the leased line to themodem.



ATS18?

The response to this command should be 255. If not, reenter thecommand in Step 4 and verify.

8. (Optional)Specify the dialback number at the NCM’s modem(i.e., the originate modem) by typing the following command andpressing Enter, if you want to use the dialback feature:



Examples:





ATL


10. Change the MultiModem V32L switches to operational settings tothose listed in Table 15 or Table 16 to make the NCM modem theoriginate modem and the N2 device modem the answer modem,after configuring the MultiModemV32L unit.

Table 15: MultiModemV32L Unit 4-Position Switch BlockSettings

Originate Modem(NCM; 4-Position Switch Block)

Answer Modem(N2 Device Side)


1 Up 1 Up

2 Down 2 Down

3 Up 3 Up

4 Down 4 Down


Table 16: MultiModemV32L Unit 8-Position Switch BlockSettings

Originate Modem(NCM Side; 8-Position

Switch Block)



1 Down 1 Down



3 Up 3 Up

4 Down 4 Down

5 Down 5 Up

6 Down 6 Down

7 Down 7 Down

8 Up 8 Up

The next step is to prepare the modem cables. Refer to Installing theModems, Using the Remote N2 Bus Application section.

Configuring the MultiModemII (MT1432A) Unit

Configuring the MultiModemII (MT1432) unit depends on whichapplication you are using: remote OWS, remote printer, or remoteN2 Bus.

Note: If you are configuring the MultiModemII (MT1932 orMT2834) unit, refer to the section, Configuring theMultiModemII (MT1932 and MT2834) Unit.


To configure the MultiModemII (MT1432) unit:



2. Set the modem’s switches (located on the side) to the following toenable it for configuration:


Table 17: MultiModemII MT1432 Unit Switch Settings

Switch Position

1 Up

2 Up

3 Down

4 Up

5 Up

6 Up

7 Up

8 Down

9 Down

10 Up

11 Up

12 Down

13 Up

14 Up

15 Up



4. Set the modem’s serial port to 9600 bps and the modem’s leasedline to 14.4 Kbps, type the following commands, pressing Enterafter each:

AT&W1&F <Enter>AT$SB9600S18=255 <Enter>AT&E1&BS0 <Enter>ATY1Q1E0&W0 <Enter>

If you want to set the modem’s serial port to some otheracceptable baud rate (300, 600, 1200, 2400, etc.), type thefollowing command, specifying the baud rate in place of xxxx.Press Enter.

AT$SBxxxx&W0 <Enter>

If the modems are not communicating properly, drop the leasedline baud rate to 9600 (or less) by typing the following commandat the terminal and pressing Enter:

AT$MB9600&W0 <Enter>

Then, set Switches 13 and 14 (baud rate) appropriately. (See theowner’s manual.)



ATL5


E0, Q1, &E1, $SBxxxx, &W0

where:

xxxx = baud rate selected



ATL7


&BS0, Y1, $SBxxxx, &W0

where:


If any of these parameters is incorrect, reenter the commands inStep 4 and verify. After verifying that the modem is properlyprogrammed, reconnect the leased line to the modem.


ATS18?

The modem should respond with 255. If not, reenter thecommands in Step 4 and verify.

8. (Optional)Specify the dialback number at the OWS’s modem(i.e., the originate modem) by typing the following command andpressing Enter, if you want to use the dialback feature:



Examples:






ATL


10. Change the MultiModemII (MT1432) switches to operationalsettings as shown in Table 18 to make the OWS modem theoriginate modem and the NCM (or JC/85 Gateway NCM) modemthe answer modem, after configuring the MultiModemII(MT1432) unit.

Table 18: MultiModemII MT1432 Unit Originate/AnswerSettings

Originate Modem(OWS Side; 16-Position

Switch Block)

Answer Modem(NCM Side; 16-Position

Switch Block)Switch Position Switch Position

1 Up 1 Up

2 Up 2 Up

3 Down 3 Down

4 Up 4 Up

5 Down 5 Up

6 Up 6 Up

7 Up (NCM)Down (JC/85 Gateway NCM)

7 Up (NCM)Down (JC/85 Gateway NCM)

8 Up 8 Up

9 Down 9 Down

10 Down 10 Down

11 Up 11 Up

12 Down 12 Down

13 Up 13 Up

14 Up 14 Up

15 Up 15 Up



The next step is to prepare the modem cables. Refer to Using theRemote Operator Workstation Application section.



To configure the MultiModemII (MT1432, MT1932, or MT2834) unit:




Table 19: MultiModemII Unit Configuration Settings

Switch Position

1 Up

2 Down

3 Down

4 Up

5 Up

6 Up

7 Up

8 Down

9 Down

10 Up

11 Up

12 Down

13 Up

14 Up

15 Up


3. After setting the modem’s switches to enable it for programming,disconnect the leased line from the back of the modem.

4. Set the modem’s serial port to 9600 bps and the modem’s leasedline to 9600 bps, type the following commands, pressing Enterafter each:

AT&W1&F <Enter>AT$SB9600S18=255 <Enter>AT&E5&E7 <Enter>AT&E1Q1E0&W0 <Enter>


If you want to set the modem’s serial port to some otheracceptable baud rate (300, 600, 1200, etc.), type the followingcommand, specifying the baud rate in place of xxxx. Press Enter.

AT$SBxxxx&W0

If the modem is not communicating properly, drop the leased linebaud rate to 9600 (or less) by typing the following command at theterminal and pressing Enter:

AT$MB9600&W0



ATL5


E0, Q1, &E1, &E5, &E7, $SBxxxx, &W0

where:




ATS18?

The modem should respond with 255. If not, reenter thecommands in Step 4 and verify. After verifying that the modem isproperly programmed, reconnect the leased line to the modem.

7. (Optional) If you want to use the dialback feature, specify thedialback number at the printer’s modem (i.e., the originatemodem) by typing the following command and pressing Enter:



Examples:






ATL


9. After configuring the MultiModemII (MT1432, 1932, or MT2834)unit, change its switches to operational settings as shown inTable 20 to make the printer modem the originate modem and theNCM modem the answer modem.

Table 20: MultiModemII Unit Originate/Answer Settings


Switch Block)



1 Up 1 Up

2 Down 2 Down

3 Down 3 Down

4 Up 4 Up

5 Down 5 Up

6 Up 6 Up

7 Up 7 Up

8 Up 8 Up

9 Down 9 Down

10 Up 10 Up

11 Up 11 Up

12 Down 12 Down

13 Up 13 Up

14 Up 14 Up

15 Up 15 Up



The next step is to prepare the modem cables. Refer to Using theRemote Printer Application section.



To configure the MultiModemII (MT1432) unit:




Table 21: MultiModemII MT1432 Unit Configuration Settings

Switch Position

1 Down

2 Up

3 Down

4 Up

5 Up

6 Up

7 Down

8 Down

9 Down

10 Up

11 Up

12 Down

13 Down

14 Up

15 Down




AT&W1&F <Enter>AT$SB9600S18=255 <Enter>AT&E0$MB9600 <Enter>ATY1Q1E0&W0 <Enter>

Note: Set the modems on each side to the same baud rate.



ATL5


E0, Q1, &E0, $MB9600, $SB9600, &W0



ATL7


Y1, $MB9600, $SB9600, &W0

If any of these parameters is incorrect, check the switch settings,reenter the four commands in Step 4, and verify. After verifyingthat the modem is properly programmed, reconnect the leased lineto the modem.


ATS18?

The modem should respond with 255. If not, reenter thefour commands in Step 4 and verify.

8. (Optional) If you want to use the dialback feature, specify thedialback number at the NCM’s modem (i.e., the originate modem)by typing the following command and pressing Enter:



Examples:






ATL


10. After configuring the MultiModemII (MT1432) unit, change itsswitches to operational settings as shown in Table 22 to make theNCM modem the originate modem and the N2 device modem theanswer modem.

Table 22: MultiModemII (MT1432) Unit Originate/AnswerSettings

Originate Modem(NCM Side; 16-Position Switch Block)



1 Down 1 Down

2 Up 2 Up

3 Down 3 Down

4 Up 4 Up

5 Down 5 Up

6 Up 6 Up

7 Down 7 Down

8 Up 8 Up

9 Down 9 Down

10 Up 10 Up

11 Up 11 Up

12 Down 12 Down

13 Down 13 Down

14 Up 14 Up

15 Down 15 Down



The next step is to prepare the modem cables. Refer to Using theRemote N2 Bus Application section.


Configuring the MultiModemII (MT1932 and MT2834) Unit

Configuring the MultiModemII (MT1932 and 2834) unit depends onwhich application you are using: remote OWS, remote printer, orremote N2 Bus.


To configure the MultiModemII (MT1932 or MT2834) unit:



2. Make sure the modem’s switches (located on the side) are set tothe following default positions as shown in Table 23 to enable itfor configuration.

Table 23: MultiModemII (MT1932 and MT2834) UnitConfiguration Settings

Switch Default Position

1 Up

2 Up

3 Down

4 Up

5 Up

6 Up

7 Down

8 Down

9 Down

10 Up

11 Down

12 Down

13 Up

14 Up

15 Up



Note: Default positions are also indicated on the modem label.



AT&W1&F <Enter>AT$SB9600S18=255 <Enter>AT&E1&BS0 <Enter>ATY0Q1E0&W0 <Enter>

If you want to set the modem’s serial port to some otheracceptable baud rate (300, 600, 1200, 2400, etc.), type thefollowing command, specifying the baud rate in place of xxxx.Press Enter.

AT$SBxxxx&W0 <Enter>

If the modems are not communicating properly, drop the leasedline baud rate to 9600 (or less) by typing the following commandat the terminal and pressing Enter:

AT$MB9600&W0 <Enter>



ATL5


E0, Q1, &E1, $SBxxxx, &W0

where:


If any of these parameters is incorrect, check the switch settings,reenter the commands in Step 4, and verify.


ATL7


&BS0, Y0, $SBxxxx, &W0

where:



If any of these parameters is incorrect, reenter the commands inStep 4 and verify. If any of these parameters are incorrect, checkthe switch settings, reenter the command in Step 4, and verify.After verifying that the modem is properly programmed, reconnectthe leased line to the modem.


ATS18?

The modem should respond with 255. If not, reenter thecommands in Step 4 and verify.

8. (Optional) If you want to use the dialback feature, specify thedialback number at the OWS’s modem (i.e., the originate modem)by typing the following command and pressing Enter:



Examples:





ATL


10. After configuring the MultiModemII (MT1932 or MT2834) unit,change its switches to operational settings as shown in Table 24 tomake the OWS modem the originate modem and the NCM(or JC/85 Gateway NCM) modem the answer modem.


Table 24: MultiModemII (MT1932 and MT2834) Unit Originate/AnswerSettings

Originate Modem(OWS Side; 16-Position

Switch Block)

Answer Modem(NCM Side; 16-Position

Switch Block)Switch Position Switch Position

1 Up 1 Up

2 Up 2 Up

3 Down 3 Down

4 Up 4 Up

5 Down 5 Up

6 Up 6 Up

7 Up (NCM)Down (Gateway NCM)

7 Up (NCM)Down (Gateway NCM)

8 Up 8 Up

9 Down 9 Down

10 Down 10 Down

11 Up 11 Up

12 Down 12 Down

13 Up 13 Up

14 Up 14 Up

15 Up 15 Up



The next step is to install the modem. Refer to Using the RemoteOperator Workstation Application section.


The steps for configuring the MultiModemII (MT1932 or MT2834)unit for the remote printer application are the same as for the MT1432model. Refer to the Configuring the MultiModemII (MT1432) Unit,Using the Remote Printer Application section.


The configuration setup for the MT1932 and MT2834BL 4-wire leasedline modem and the MT2834BA 2-wire leased line modem is the samewith one exception. When configuring the MT1932 or MT2834BA,ignore the “S18=255” parameter in Step 3.


To configure the MultiModemII (MT1932 and MT2834) unit:



2. Set the modem’s switches (located on the side) to the following asshown in Table 25 to enable it for configuration:

Table 25: MultiModemII MT1932 and MT2834 UnitConfiguration Settings

Switch Position

1 Up

2 Up

3 Down

4 Up

5 Up

6 Up

7 Down

8 Down

9 Down

10 Up

11 Down

12 Down

13 Down

14 Down

15 Down



4. Set the modem’s serial port to 9600 bps and the modem’s leasedline to 9600 bps, type the following commands, pressing Enterafter each:

AT&W1&F <Enter>AT$SB9600S18=255 <Enter>AT&E0$MB9600#F0 <Enter>ATY0Q1E0&W0 <Enter>

Note: Set the modems on each side to the same baud rate.



ATL5


E0, Q1, &E0, $MB9600, $SB9600, &W0

If any of these parameters is incorrect, check the switch settings,reenter the four commands in Step 4, and verify.


ATL7


Y0, $MB9600, #F0 $SB9600, &W0

If any of these parameters are incorrect, check the switch settings,reenter the command in Step 4, and verify. After verifying that themodem is properly programmed, reconnect the leased line to themodem.


ATS18?

The modem should respond with 255. If not, reenter the fourcommands in Step 4 and verify.

8. (Optional) If you want to use the dialback feature, specify thedialback number at the NCM’s modem (i.e., the originate modem)by typing the following command and pressing Enter:



Examples:






ATL


10. After configuring the MultiModemII (MT 1932 and MT2834)unit, change its switches to operational settings as shown inTable 26 to make the NCM modem the originate modem and theN2 device modem the answer modem.

Table 26: MultiModemII (MT1932 and MT2834) Unit OperationalSettings

Originate Modem(NCM Side; 16-Position Switch Block)



1 Down 1 Down

2 Up 2 Up

3 Down 3 Down

4 Up 4 Up

5 Down 5 Up

6 Up 6 Up

7 Down 7 Down

8 Up 8 Up

9 Down 9 Down

10 Down 10 Down

11 Up 11 Up

12 Down 12 Down

13 Down 13 Down

14 Down 14 Down

15 Down 15 Down



The next step is to install the modem. Refer to Using the RemoteN2 Bus Application section.


Using Commissioning Procedures

Verifying Modems are Working

When the modems are working properly, the TR and CD lights are onsteady, and the appropriate baud rate lights are on (remote N2application) or flashing (remote OWS or printer application;MultiModemV32L unit only). Also, the SD and RD lights are blinkingto indicate that data is being transferred. If any of the lights are notworking in these ways, refer to the Troubleshooting Proceduressection for assistance.

Checking the Dialback Line

If you are using the dialback line, verify its operation. Force themodem to switch to the dialback line by pressing down and releasingthe Voice/Data switch on the originate modem and disconnecting theleased line. The originate modem disconnects from the answer modemand calls the modem on the dialback line. If the modem on thedialback line does not answer within the prescribed time period, theoriginate modem defaults to the modem on the leased line.

To return the modem to leased line operation, reconnect the leased lineand press the Voice/Data switch down again. The originate modemdisconnects from the modem on the dialback line and reconnects to themodem on the leased line. At this point, a communication bug in themodem may cause an interruption in communication. (For details, referto the Troubleshooting Procedures section.) To verify the bug iscleared and the modem reset, simply cycle power on the originatemodem.

If for any reason you press down on the Voice/Data switch on theanswer modem, the answer modem disconnects the line that iscurrently being used. The originate modem then attemptscommunication over the leased line first, then the dialback line. Themodem continues to toggle between the 2 lines until it makes aconnection.


Installing the Modems

After you have configured the modems, the next step is to prepare andconnect modem cables. Which cables to prepare and how to connectthem depends on which application you are using: remote OWS,remote printer, or remote N2 Bus. Refer to the sections that follow.


To make the modem cables:

1. Prepare the cable that connects between the serial port and themodem, if you are using the NCM’s RS-232 serial port. For theNCM101/102/401/200, refer to Figure 5. For the NCM300, referto Figure 6. Because of the recessed connector on theNCM101/102/401/200, a special right-angle cable with a narrowprofile shell is required to attach to the RS-232 port(NU-CBL101-0). Connect the pigtailed wires of this cable into aseparately ordered hood (MHK101).

Note: For additional information on the NCM300, refer to theNetwork Control Module 300 Series Technical Bulletin(LIT-6360251).

Out

In

Out

12345678

1820

FG

TD Black

RD Brown

RTS Red

CTS Orange

DSR Yellow

SG Green

DCD Blue

DTR White

DCE DCD Violet

NCM RS-232 Port Modem(male)(male)

In

Out

In

Out

Out

In

Out

Out

In

12345678

1820In

NCPT-MOD

Out

Figure 5: Cable Between NCM101/102/401/200’s RS-232Port and Modem (NU-CBL101-0)


1

2

3

4

5

6

7

8

9

DCD

RD

TD

DTR

SG

DSR

RTS

CTS

NC

NCM300

9-pin Female

2

3

4

5

6

7

8

20

Modem

or System Adapter

25-pin Male

Shell

NC3FIG9

Shell

In

In

Out

Out

In

Out

In

In

Out

In

Out

Out

Out

In

Figure 6: Cable Between NCM300’s Port 2 (RS-232)and Modem

If you are using the RS-232 submodule, prepare the RS-232 cable(NU-CBL101-0) shown in Figure 7. This cable connects between thesubmodule and modem.

RS-232 Submodule(male)

Modem(male)

Out

Out

Out

Out

Out

Out

Out

In

In

In

In

In

In

In

123456781820

Shell

2345678

1820

FG

TD Black

RD Brown

RTS Red

CTS Orange

DSR Yellow

SG Green

DCD Blue

DTR White

Unused VioletOut In

In

RS2-MOD1

Figure 7: Cable Between NCM’s RS-232 Submoduleand Modem (NU-CBL101-0)


2. Prepare the RS-232 cable that connects between the PS/2 OWSand the modem (if you have a PS/2). The pinouts are shown inFigure 8.

Out

Out

Out

Out

Out

Out

Out

In

In

In

In

In

In

In

12345678

1820

Shell

2345678

1820

FG

TD Black

RD Brown

RTS Red

CTS Orange

DSR Yellow

SG Green

DCD Blue

DTR White

Unused Violet

(male)Modem(male)

Out In

In

PS/2 OperatorWorkstation

RS2-MOD2

Allied Part No. CON94-3870-10

Figure 8: Cable Between PS/2 Operator Workstationand Modem

If you have a Compaq Deskpro or Compaq portable, prepare theRS-232 cable that connects between the Compaq or portableWorkstation and the modem. The pinouts are shown in Figure 9.

Shell

123456789

2345678

2022

Shell

Compaq or Portable

Workstation(9-pin female)

Modem(25-pin male)

Out

In

In

In

In

Out

Out

Out

Out

In

InIn

Out

Out

COM

Out

PORT-MOD

In

FG

Allied Part No. CON94-3856-6

Figure 9: Cable Between Compaq orPortable Workstation and Modem


Preparing Modem Cables for JC/85 Gateway

If you are using the leased line modems for a JC/85 Gatewayapplication, prepare the cable required to connect the JC/85/40minicomputer (CPU-101/-110/-112) and the leased line modem (eithermodel) See Figure 10.

Out

In

Out

123456

712162022

FG

TD Black

RD Brown

CTS Red

RTS Orange

DTR Yellow

SG Green

Speed Blue

DCD White

Unused Violet

JC/85/40 CPU-101/110/112PCA-110

MultiTechLeased Line Modem

(male)(male)

Out

In

In

Out

Out

In

Out

12354

20

7121368

CABLE1

In

DSR GrayIn

OutIn

In

Cable Application No. C02.M06

Figure 10: Cable Between JC/85/40 CPU-101/110/112and Modem

To prepare the modem cables:

1. Prepare the cable required to connect the JC/85/40 minicomputer(CPU-111/-113) and the leased line modem (either model) asshown in Figure 11.


Out

In

12345678

201413

FG

TD Black

RD Brown

RTS Red

CTS Orange

DSR Yellow

SG Green

DCD Blue

Unused White

DTR Violet

JC/85/40 CPU-111/1132/4 Channel


(male)(male)

Out

In

12345876

201413

CABLE2

In

Unused Gray


Out

In

In

Out

In

Out

Out

Out

In

Figure 11: Cable Between JC/85/40 CPU-111/113 andModem

2. Prepare the cable required between the JC/85 Gateway NCM andthe leased line modem (either model) as shown in Figure 12.

Out

Out

Out

Out

Out

Out

Out

In

In

In

In

In

In

In

12345678

18*20

Shell

2345678

18*20

FG

TD Black

RD Brown

RTS Red

CTS Orange

DSR Yellow

SG Green

DCD Blue

DTR White

Unused Violet

JC/85 Gateway NCM

(RS-232 Submodule)(male)


(male)

CABLE3


If you are using MultiTech MultiModem V32L, cut Pin 18 at

the modem end.*

Figure 12: Cable Between JC/85 Gateway NCM and Modem


RESET

(either or)

RS-232 Submodule

Port

NCM

RS-232

PortModem

To Dialback Line

To Power To Power

Operator

Workstation

Serial

Modem

To Dialback Line

To Leased Line(or Dedicated Line)

To Leased Line(or Dedicated Line) OWSCONN

For NCM300, RS-232 connection is made at Port 2.

(RS-232 port).

Note:

Figure 13: Connecting the Cables for Remote Operator Workstation

Connecting the Cables

To connect the cables, referring to Figure 13.

1. Connect the serial port and the modem with the cable shown inFigure 5, if you are using the NCM’s RS-232 serial port. (For theNCM300, connect the cable shown in Figure 6 between theNCM’s Port 2 and the modem.)

If you are using the RS-232 submodule, connect the cable shownin Figure 7 between the submodule and the modem.

2. Connect the RS-232 cable between the modem and the OWS’sserial port (i.e., same serial port used for direct connect). TheRS-232 cable is shown in Figure 5 or Figure 7.

3. Plug in one end of the RJ11 cable for the leased line into theLeased Line connector, for each modem, and the other end into themodular phone jack provided by the telephone company. If youare using dedicated wire instead of leased line, route and terminatethe dedicated wire to the Leased Line connector.

4. (Optional)Plug in one end of the RJ11 cable for the standardtelephone line into the Dial Line connector, and the other end intothe modular phone jack provided by the telephone company, ifyou are using the dialback feature. Do this for each modem.

5. Plug the AC power transformer into the Power connection, foreach modem. Turn on the modems by flipping the On/Off switchto On.

The modems now run diagnostic self-tests. (The speed indicatorsflash.) If the OWS and the NCM are on, the TR light and one or moreof the baud rate lights come on. Then, after about 30 seconds, the CDlight goes on, and the appropriate baud rate lights flash(MultiModemV32L unit) or go on steady (MultiModemII unit). Ifthese lights remain off, refer to the modem owner’s manual.



Preparing Modem Cables

To make the modem cables.

1. Prepare the cable that connects between the serial port and themodem, if you are using the NCM’s RS-232 serial port. For theNCM101/102/401/200, refer to Figure 5. For the NCM300, referto Figure 6. Because of the recessed connector on theNCM101/102/401/200, a special right-angle cable with a narrowprofile shell is required to attach to the RS-232 port(NU-CBL101-0). Connect the pigtailed wires of this cable into aseparately ordered hood (MHK101).

If you are using the RS-232 submodule, prepare the RS-232 cable(NU-CBL101-0) shown in Figure 7. This cable connects betweenthe submodule and modem.

2. Prepare the RS-232 cable that connects between the modem andthe printer (Figure 14). This is a straight-through, 25-to-25 pincable. A minimum of Pins 2, 3, 4, 5, 6, 7, 8, and 20 is required.

Out

Out

Out

Out

Out

Out

Out

In

In

In

In

In

In

In

12345678

1820

Shell

2345678

1820

IBM Proprinter III(male; MHK 101)

FG

TD Black

RD Brown

RTS Red

CTS Orange

DSR Yellow

SG Green

DCD Blue

DTR White

Modem(male)

Unused Violet

MOD-PRT

R

Figure 14: Cable Between Modem and Printer(NU-CBL101-0)

Connecting the CablesTo connect the cables, referring to Figure 14.

1. Connect the cable shown in Figure 5 between the serial port andthe modem, if you are using the NCM’s RS-232 serial port,. (Forthe NCM300, connect the cable shown Figure 6 between theNCM’s Port 2 and the modem.)

If you are using the RS-232 submodule, connect the cable shownin Figure 7 between the submodule and the modem.


2. Connect the RS-232 cable shown in Figure 14 between the printerand the modem.

3. Plug in one end of the RJ11 cable for the leased line into theLeased Line connector, and the other end into the modular phonejack provided by the telephone company, for each modem. If youare using dedicated wire instead of leased line, route and terminatethe dedicated wire to the Leased Line connector.


5. Plug the AC power transformer into the Power connection, foreach modem. Turn the modems on.

The modems now run diagnostic self-tests. (The speed indicatorsflash.) If the printer and the NCM are on, the TR light and one or moreof the baud rate lights come on. Then, after about 30 seconds, the CDlight goes on, and the appropriate baud rate lights flash(MultiModemV32Lunit ) or go on steady (MultiModemII unit). Ifthese lights remain off, refer to the modem owner’s manual.

Modem

To Power To Power

Modem

To Dialback Line


(either or)

RS-232 Submodule

Port

To Dialback Line

To Leased Line(or Dedicated Line) prntconn

RESET

NCM

RS-232

Port

Printer

Serial

For NCM300, RS-232 connection is made at Port 2.

(RS-232 port).

Note:

Figure 15: Connecting the Cables for Remote Printer



B & B RS-232 to RS-485 Converter

Follow these instructions to use the RS-232 to RS-485 converter(Model 485TBLED manufactured by B & B Electronics):

There are two jumpers on the B & B converter (Figure 16).

1. Insert one jumper in the CONTROL SD location and insert theother jumper in the ECHO OFF location. The SD position causesa timed internal Request to Send (RTS) signal to be generatedwhen the TD signal is active.

2. Insert an external 100 ohm resistor between the GND terminal andthe N2 cable reference wire.

Note: The external power supply common is also connected tothe GND terminal. No connection is made to theFR GND SHIELD terminal on the B & B converter.

3. Connect Terminals TD(A) and RD(A) together with an externaljumper wire: This is the N2- line connection point. ConnectTerminals TD(B) and RD(B) together with an external jumperwire. This is the N2+ connection point.

TB1 FR.GNDSHIELDTD(A)

TD(B)

RD(A)

RD(B)

GND

+12VDC

N2-N2+REF.

100 ohm

ECHO CONTROLOFFON

RTSSD

C6 R9

B & B Electronics

Model 485TBLED

485PS2

bbcvt

ConverterRS-232 to RS-485

RS-485RS-232

Figure 16: B & B Electronics Converter and Power Supply


There is no need for an End-of-Line Resistor (EOLR) when using theB & B converter. B & B converters produce an N2 bias, which exceedsthe 0.4 V stated in the Troubleshooting Procedures section of theN2 Communications Bus Technical Bulletin (LIT-636018). TheMetasys system devices already provide the necessary N2 drive power.If you exceed 32 devices on either the remote or the local trunk,insert an N2 repeater after 32 devices instead of after the normal50 devices. For more information on the N2, refer to theN2 Communications Bus Technical Bulletin (LIT-636018).

Note: When baseframe equipment (DCM, XRE, XRL, XRM,XBN) is used at the remote end, special timing is required onthe converter that attaches to that equipment. The converterturnaround time must be faster to work with these devices.Resistor R9 must be changed from the standard 100 K ohmto a 68 K ohm, 1%, 1/8 watt resistor. B & B Electronicsprovides this change. Order a “*modification line item:change R9 to a 68 K ohm, 1% resistor” when placing yourorder.

Preparing Modem Cables

To make the modem cables:

1. Prepare the RS-232 cable that connects between the RS-232submodule and the modem, if you are using the NCM’s RS-232submodule. The pinouts are shown Figure 17. Because of therecessed connector on the NCM, a special right-angle cable with anarrow profile shell is required to attach to the RS-232 port(NU-CBL101-0). Connect the pigtailed wires of this cable into aseparately ordered hood (MHK101).


RS-232 Submodule(male)

Modem(male)

Out

Out

Out

Out

Out

Out

Out

In

In

In

In

In

In

In

123456781820

Shell

2345678

1820

FG

TD Black

RD Brown

RTS Red

CTS Orange

DSR Yellow

SG Green

DCD Blue

DTR White

Unused VioletOut In

In

RS2-MOD1

Figure 17: Cable Between NCM’s RS-232 Submoduleand Modem (NU-CBL101-0)

2. Prepare the RS-232 cable that connects between the RS-232-to-N2Bus converter and the modem, if you are using the N2 converter.The pinouts are shown in Figure 18.

Out

In

FG

TD Black

RD Brown

Modem(male)

In

Out

In

SG

12347

12347

Converter(male)

MOD-CNTR

Figure 18: Cable Between Converterand Modem (NU-CBL101-0)


Connecting the N2 Bus and Modems

Follow these instructions, referring to Figures 17, 18, and 19.

1. Connect the RS-232 cable that is shown in Figure 17 between thesubmodule and the modem, if you are using the RS-232submodule.

If you are not using the RS-232 submodule, wire the N2 Busbetween the Communication Terminal Board (TBC) on the NCU(or N2 terminal block on the NCM300) and the converter(Figures 20 and 21).

2. Connect the RS-232 cables shown in Figure 18 between themodem and the converter.

3. Connect the converter to the N2 Bus.

4. Plug in one end of the RJ11 cable for the leased line into theLeased Line connector, and the other end into the modular phonejack provided by the telephone company, for each modem. If youare using dedicated wire instead of leased line, route and terminatethe dedicated wire to the Leased Line connector.


6. Plug the AC power transformer into the Power connection, foreach modem. Turn the modems on.

7. Plug the power transformer into a power connection, for eachconverter.

After power up, the modems run a diagnostic self-test. (The speedindicators flash.) The TR light and the 96 light go on. Then, after about30 seconds, the CD light goes on and the 96 light remains on. If theselights remain off, refer to the modem owner’s manual.

! CAUTION: Turn off the modem’s power before

disconnecting the leased line from the modem.Otherwise, the modem will send outunintelligible data that may adversely affect N2communications.


NCM

Modem

To Power

To Dialback Line



To N2 BusDevices

2-Slot NCU

TBC

N2 Bus

Modem

To Power

To Dialback Line

To Leased Line(or Dedicated Line) N2CONN

(either or)

For NCM300, N2 connection is made at its N2 terminal block,not at the TBC.

Note:

RS-232 Submodule*

* NCM101/102/401 Only

93 0hmTerminator Cap

FR.

GN

D

Shie

ld

TD(

A)

TD(

B)

RD(

A)

TD(

B)

GN

D

+12

VD

C

Of

f

On

RT

S

SD

Ec

ho

Co

ntro

l

RS-232 TO RS-485COMERTER (485TBLED

RS-232

FR

. G

ND

Sh

ield

TD

(A

)

TD

(B

)

RD

(A

)

TD

(B

)G

ND

+1

2V

DC

Of

fO

nR

TS

SD

Ec

ho

Co

ntro

l


RS-232


Figure 19: Connecting the Cables for Remote N2 Bus

SFTGND

SFTGND

For two twisted pair cable, terminate one pair to (+) and (-), and terminate one or both wires ofthe other pair to REF. If you terminate one wireto REF, fold back and tape the other wire.

If shielded wire is used, wire shield to SFT GRD(soft ground) terminal. To hard ground N2 Bus,wire shield to HRD GRD (hard ground). N2 Busshould be hard grounded at only one location,preferrably at the NCU.

N2-N2+

HRDGND

6 3

5 2

4 1

REFOUT

N2 OUT (-)

RS-232-to-N2 BusConverter

CommunicationTerminal Board (TBC)

TB1

Note:

TBCWIRE

Figure 20: Wiring N2 Bus Between TBC and Converter

RS-232-to-N2 BusConverter

N2 BusTermnal Block

NC300WR

NCM300

1 2 3 4 5 6 7 8

1

2 3 4 5 6 7

POWER

ON

CONFIG

.

RE

FN

2

-

N2

+

D AN G E R

L INE VO LT AG E

IN S ID E

D-RAM

- AT T E N T IO N -PLEASE DISCONNEDT BATT ERY

B E F O R E I N S T A L L I N G M E M O R Y

REFN2-N2+

REFN2-N2+

Figure 21: Wiring N2 Bus Between NCM300 and Converter


Alternate Method for Connecting N2 Bus and Modems

There is an alternate method for connecting the N2 Bus and modemsthat requires the use of a repeater at the remote location. Use thismethod only if the remote N2 devices (AHU, VAV, UNT, etc.) do notcome online, or cycle online and offline. The repeater may be neededwhen the:

• remote side has as few as five devices

• N2 Bus length is greater than 500 feet (one way for 18 AWG)

• N2 Bus length is greater than 1000 feet (one way for 24 AWG)

• N2 Bus is in an electrically noisy environment

The method requires the installation of the repeater on the output sideof the converter at the remote location. All N2 devices should comeonline or stop cycling online and offline. Refer to Figure 22.

NCM

Modem

To Power

To Dialback Line


Converter


2-Slot NCU

TBC

N2 Bus

Modem

To Power

To Dialback Line


N2CONN2

(either or)

RepeaterSide A: EOL InSide B: EOL In

A

B

To Remote N2 Bus Devices

Add repeater here.

For NCM300, N2 connection is made at its N2 terminal block,not at the TBC.

Note:

93 OhmTerminator Cap

* NCM101/102/401 Only

RS-232 Submodule*

FR

. GN

D

Sh

ield

TD

(A)

TD

(B)

RD

(A)

TD

(B)

GN

D

+12

VD

C

Off

On

RT

S

SD

Ech

oC

on

tro

l

RS-232 TO RS-485 COMERTER (485TBLED

RS-232

FR

. G

ND

Sh

ield

TD

(A)

TD

(B)

RD

(A)

TD

(B)

GN

D

+1

2VD

C

Off

On

RT

S

SD

Ec

hoC

ontr

ol


RS-232

Model 485TBLED

Figure 22: Alternate Method of Connecting N2 Bus and Modems

For future jobs that meet any of the above criteria, include the cost ofthe repeater in the estimate. Currently, the recommended repeaters arethe Acromag 4683-TTM-1 (115 VAC) and Acromag 4683-TTM-2 (230VAC). Refer to the N2 Communications Bus Technical Bulletin (LIT-636018) for installation details.


Troubleshooting ProceduresThe leased line modem installation requires troubleshooting whencommunication between the components has been lost. This sectioncontains information that will help you isolate and correctcommunication problems.

To troubleshoot the leased line modem installation, ask yourself thequestions that are in Table 27.

Table 27: Troubleshooting the Leased Line ModemInstallation

Question If No, Action

Are the leased lines and dialbacklines (optional) at each modemsecurely connected?

Tug on the lines to verify tightinstallation.

Are the modems configured properlyas described in this document?

Refer to the Configuring the Modemssection for configuration details.

Are the TR and CD lights on steady? First, determine if the modem isimproperly configured. Next, look forloose or bad connections. Last,determine if the modem or leased lineis defective.

Are the same baud rate lights on forboth modems?

Set the modems to the same baud rate.

Is the baud rate light on steady?(MultiModemII application or remoteN2 application with MultiModemV32Lunit)

Is the baud rate light flashing?(remote OWS or remote Printerapplication with MultiModemV32Lunit)

First, determine if the modem isimproperly configured. Next, look forloose or bad connections. Last,determine if the modem or leased lineis defective.

With the modems connected to theMetasys system, are the SD and RDlights blinking?

First, determine if the modem isimproperly configured. Next, look forloose or bad connections. Last,determine if the modem or leased lineis defective.

If you notice that the TR light is on but the CD light is off, check forany loose connections, improper configuration, or a defective modem.


Checking for a Defective Modem

Follow these steps to check whether a defective leased line modem iscausing a communication problem.

1. Force DTR On at both modems by placing Switch 1 of 8 down(MultiModemV32L unit) or Switch 1 down (MultiModemII unit).

2. Set to full duplex the terminal that you used to initially programthe modems.

3. Connect a straight-through cable between the terminal and one ofthe modems. Connect the leased line between the two modems.

4. At the other modem, jumper Pins 2 and 3 on the modem’s DB25input.

5. Begin typing on the terminal. If the letters you type display, thetwo modems are communicating over the leased line. If the lettersdo not display, the modems are not communicating.

6. Replace one of the modems with a working MultiModemV32Lunit or MultiModemII unit.

If communication is now established, you have determined thatthe other modem is defective. Refer to the manufacturer’sliterature for the return policy.

If communication is not established, the leased lines must bedefective. Contact your telephone company.


Checking Revision Level

This troubleshooting technique applies to the MultiModemV32L unitonly, and determines if your modem has a communication bug. Withthe modem connected to the terminal, type the following commandand press Enter:

ATI1

The screen displays the firmware revision of the modem. If yourMultiModemV32L unit is at Revision 7.04 or earlier, its firmware hasa communication bug. This bug causes the originate modem to go intoan error state during which it loses communication with the networkmomentarily. When this occurs, the OWS will report that the N2devices, printer, or the direct connect is offline. Then, a minute or twolater, the leased line modem will come back online. This pattern cyclesevery 255 minutes (i.e., the value of S18 as set during configuration).The modem goes into the error state only when:

• the leased line is restored after being offline, and a dialback line isnot connected

• you press the Voice/Data switch and the dialback line is notconnected

• the dialback line is being used and you press the Voice/Data switchto go back to leased line while the modems are communicating

To clear this problem, cycle power on the originate modem while themodems are operating on leased line. This resets the originate modemand restores proper communication. Then, if at any other time theNCM, printer, or N2 device go offline again, cycle power on theoriginate modem to reset.

Modem Does Not Configure Properly

If the MultiModemII MT2834BL/BLI unit does not configure properlyin any of the applications (remote workstation, remote N2 Bus, orremote printer), perform the following steps:

1. Set all modem switches to the factory default positions forasynchronous operation. The settings are listed on the bottom ofthe modem.

2. Enter the command AT&W1&F and press Enter, at 9600 baud. Thissets the modem to the factory defaults.

3. Set the switches and configure the modem as described in thisdocument.

If you have further problems, please contact the Field Support Centerin Milwaukee at 1-888-281-3792.


Reference

Modem Commands

Table 28 lists the modem commands that are important to thisapplication.

Table 28: Modem Commands

Command Description

E0 Suppresses command character echo.

S18=255 Disables modems from interrupting communication for255 minutes.

Q1 Suppresses result codes.

Y1 Enables Carrier Detect to go low immediately on space breaks(needed for proper handshaking).

$BA Allows speed conversion between the serial port and line I/O.

$MB9600 Sets line baud rate to 9600 bps.

$SB9600 Sets serial port output to 9600 baud.

&BS0 Puts transmit block size to 64 characters maximum (used for fastererror detection/correction).

&E0 Disables error correction.

&E1 Enables auto reliable error correction.

&E5 Enables Xon/Xoff modem-initiated flow control.

&E6 Disables Xon/Xoff characters from being passed through themodems.

&E7 Enables Xon/Xoff characters to be passed through the modems.

&W0 Stores configuration in EEPROM.

&W1&F Sets modem to factory defaults.

Modem Switch Settings

The modem’s switch settings are described in a summary that isattached to the bottom of the unit. Consult the summary for moreinformation. Also note that the switches on the MultiModemV32L unitare located on the bottom and the switches on the MultiModemII unitare on the side.


Ordering Information

Johnson Controls Code Numbers

Table 29: Johnson Controls Code Numbers

Description Product Code Number

RS-232 Cable (35 feet) NU-CBL101-0

RS-232 Male Hood (One Required forEach Cable)

MHK101

Vendor Code Numbers

The MultiModemV32L unit or MultiModemII unit can be purchasedfrom the dealer listed in the following table. Specify a JohnsonControls order to obtain the discount.

Table 30: Vendor Code Numbers

Description Model Number Dealer

RS-232 to N2 BusConverter

485TBLED B & B Electronics707 Dayton RoadPO Box 1040Ottawa, IL 61350(815) 433-5100

Power Supply forConverter

485PS2 B & B Electronics707 Dayton RoadPO Box 1040Ottawa, IL 61350(815) 433-5100

Multi-TechSystemsMultiModemII(Leased LineModem)

MT2834BL (2 or 4 wire)(115 VAC)

MT2834BA (2 wire only)

MT2834BLI (240 VAC)

Note: This modelreplacesMT1432BL/BLI.

Delta Communications, Inc11617 W. Bluemound RoadWauwatosa, WI 53226(414) 774-7270(414) 777-7277 (FAX)

or

Johnson Controls IT AcquisitionServices (ITAS) Department


Ordering a Leased Line

Contact your local telephone company to establish a private line inyour building. Ask for the following:

Table 31: Ordering a Leased Line

Category Specification

Circuit/Channel Type 3002 (four wire) or 3003 (two wire) or localequivalent

Voice-grade line

Point-to-point (i.e., two point)

Full duplex

Baud Rate 9600 bps

Signal Conditioning No

Connecting Arrangement Modular, pinch plug (RJ11)

The telephone company will also ask for the address, city, cross street,billing telephone number, and existing account number of theinstallation. You may have to answer other questions specific to yourtelephone company and location.

If you have any further questions regarding line compatibility withthese modems, contact your local distributor or Multi-Tech Systems,Inc.

Controls Group507 E. Michigan Street www.johnsoncontrols.comP.O. Box 423 Release 12.00Milwaukee, WI 53201 Printed in U.S.A.

Leased Line Modem Application Note

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