(Communication)

A.

LabVIEW .

LabVIEW Serial I/O, GPIB I/O, VISA I/O

.

LabVIEW instrument

B. Serial

Serial . serial 1 1bit receiver transmitter . .

Serial 1 serial 1 device . string . carriage return, line feed, semicolon . .

LabVIEW Instrument I/O Serial serial

serial . Flow control handshaking . Buffer size VI . Port number . Baud rate, data bit, stop bit, parity

port number serial string( )

: Serial .

1. Serial Port Init VI serial .

2. Serial Port Write VI .

3. Bytes at Serial Port VI serial .

4. , Serial Port Read VI .

port number serial buffer byte byte count .

port number serial requested by count

C. IEEE 488 (GPIB)

GPIB 488.2 VI GPIB VI . GPIB 488.2 VI LabVIEW IEEE 488.2 . VI National Instruments NI-488.2 IEEE 488.2 . , GPIB VI .GPIB . GPIB , , .1970 HP General Purpose Interface Bus(GPIB) , 1975 IEEE , GPIB IEEE 488 . GPIB, HP-IB, IEEE 488 . GPIB 24 parallel bus. 8 , 5 (ATN, EOI, IFC, REN, SRQ), 3 handshake, 8 . GPIB 8 parallel, byte serial, asynchronous . handshake .GPIB byte(8 bit), ASCII string .

3.

1. , GPIB (EOI) .

2. end-of-string(EOS) . EOI EOS , EOI EOS .

3. Listener handshake .

0~30 GPIB . 0 GPIB . GPIB 1~30 . GPIB () . 1 Talker 1 Listener . string Talker Listener handshake. LabVIEW GPIB VI .

GPIB VIsLabVIEW GPIB VI Instrument GPIB GPIB 488.2 . VI Low-level 488.2 . GPIB string . GPIB Write GPIB Read.

Data string address string GPIB .Mode GPIB write . timeout ms . Error In Error Out cluster error handler VI . Status 16-element Boolean array GPIB .

: GPIB Write VI string VDC;MEAS1? GPIB address 2 . mode(0) timeout ms(25000) .

GPIB Read VI .

(1) VI ,

(2) VI ,

(3) VI time limit ,

(4) VI END(EOI asserted) ,

(5) VI end of string (EOS)

address string byte count . byte count mode . data string .

: GPIB Read VI 2 20 . mode(0) time-out ms(25000) .

GPIB VI GPIB

: GPIB VI . GPIB VI GPIB write GPIB read . *idn? IEEE 488.2 . identification string .

1.File New Panel .

2. Panel Control indicator .

Control indicator pop-up Create Control Create Indicator .

3.Write Data string *idn? . Read Byte Count numeric 100 .

1.Diagram Window .

2. .

GPIB Write(Instrument I/O :: GPIB ): string GPIB .

GPIB Read(Instrument I/O :: GPIB ): GPIB .

General Error Handler VI(Time & Dialog ): VI cluster , dialog box .

3. VI .

Identification string Read Data . GPIB , EABO error=6 . *idn? .

* .

D. VISA

VISA Virtual Instrumentation Software Architecture. VISA VXI, GPIB, RS-232, LabVIEW . VISA VXIplug & play System Alliance , 35 . VISA instrument I/O . Function Instrument I/O VISA . VISA VISA session . VISA session Path and Refnum .

VISA session session identifier. VI I/O configuration .

VISA session VISA Open VISA primitive . VISA Open VISA session . file I/O file refnum .VISA session Instr class. VISA session pop-up class GPIB Instr, Serial Instr, VISA/GPIB-VXI RBD Instr, Generic Event, Trigger Event, VXI Signal Event, Resource Manager .

VISA VISA Open, VISA Write, VISA Read, VISA Close .

VISA Open Resource Name VISA session(for class) device . session identifier VISA session device .Resource Name I/O

GPIB GPIB keyword . Embedded MXIbus VXI VXI keyword . GPIB-VXI GPIB-VXI keyword .Asynchronous serial ASEL keyword .

Interface SERIALASRL[board][::INSTR]GPIBGPIB[board]::primary address[:: secondary address][::INSTR]VXIVXI[board]::VXI logical address[::INSTR]GPIB-VXIGPIB-VXI[board][::GPIB-VXI primary address]::VXI logical address[::INSTR]

VISA Open primary 2 GPIB GPIB::2::0::INSTR instrument descriptor string

VISA Write write buffer string VISA session . dup VISA session handle . UNIX synchronously , asynchronously . return count .

VISA Read VISA session data .byte count data read buffer . dup VISA session handle . UNIX synchronously , asynchronously .return count

VISA Close VISA session close.

VISA VI GPIB/Serial

VISA write VISA read VISA VI (GPIB Serial) . *idn? GPIB serial , identification string . VISA Fluke 45

1. Panel .

VISA session Path & Refnum . VISA Open pop-up .

2.Resource Name string .

2 GPIB : GPIB::2::0::INSTRCOM1 serial: ASRL1::INSTR

* Note : VISA Open Online Help Resource Name .

3.Write string Contrl *idn? . Byte Control 100 .

1. .

2. .

VISA Open (Instrument I/O::VISA ) : communica-tion session VISA session refnum .

VISA Write (Instrument I/O::VISA ) : string .

VISA Open (Instrument I/O::VISA ) : .

VISA Open (Instrument I/O::VISA ) : VISA session .

3. VI .

VISA session INSTR . VISA session pop-up VISA class .Resource name serial GPIB .

4.VI VISA. vi .

E. LabVIEW Instrument

Instrument S/W . LabVIEW instrument . . . Instrument SubVI Sub VI .

Instrument TemplatesLabVIEW example directory VISA instrument template VI LabVIEW EXAMPLES INSTR INSTTMPL *.LLB . instrument VI, instrument LabVIEW . Instrument LabVIEW instrument template VI . Template VI instrument , VI .

F. LabVIEW Instrument

HP34401A Getting Started instrument . HP34401A Multimeter VI .

LabVIEW EXAMPLES INSTR HP34401A.LLB HP34401A Getting Started VI .HP34401A Getting Started VI instrument VI. VI . Help Show Help Help .HP34401A Getting Started VI indicator . instrument documentation . High-level VI configure . VI HP34401A instrument VI . VI VISA .

Instrument

3-2 VISA.VI Instrument . VISA.VI .

1. VISA.VI .

2. .

1. Diagram Window .

2. Diagram Window .

Edit Create SubVI . SubVI .

3. , Edit Create SubVI .

4. , Edit Create SubVI .

5. instrument SubVI , SubVI Instrument Initialize .vi, Instrument Application. Vi, Instrument Close. vi Seminar.llb

Note: VI , Icon Editor . pop-up Icon Editor

6. Instrument SubVI Seminar.llb , SubVI .

7. . Resource Name string GPIB::2::0::INSTR . VI .

2 GPIB , 2 GPIB . Write Buffer string .

8.VI Instrument driver.vi .

a

RS-232 Cable

Serial Port

RS-232 Instrument

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