Agilent Technologies E8257D PSG Instrukcja Użytkownika Pobierz pdf (Strona 76)

64 Agilent N516xA, N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide

Using IO Interfaces

RS–232 Programming Interface Examples

Interface Check Using HP BASIC

This portion of the example program “Interface Check Using HP BASIC” on page 64, causes the signal

generator to perform an instrument reset. The SCPI command *RST will place the signal generator

into a pre–defined state.

The serial interface address for the signal generator in this example is 9. The serial port used is

COM1 (Serial A on some computers). Refer to “Using RS–232 (ESG, PSG, and E8663B Only)” on

page 58 for more information.

The following program example is available on the signal generator’s Documentation CD–ROM as

rs232ex1.txt. For the full text of this program, refer to “Interface Check Using HP BASIC” on

page 142 or to the signal generator’s documentation CD–ROM.

170 CONTROL 9,0;1 ! Resets the RS-232 interface

180 CONTROL 9,3;9600 ! Sets the baud rate to match the sig gen

190 STATUS 9,4;Stat ! Reads the value of register 4

200 Num=BINAND(Stat,7) ! Gets the AND value

210 CONTROL 9,4;Num ! Sets parity to NONE

220 OUTPUT 9;"*RST" ! Outputs reset to the sig gen

Interface Check Using VISA and C

This portion of the example program “Interface Check Using VISA and C” on page 64, uses VISA

library functions to communicate with the signal generator. The program verifies that the RS–232

connections and interface are functional. In this example the COM2 port is used. The serial port is

referred to in the VISA library as ‘ASRL1’ or ‘ASRL2’ depending on the computer serial port you are

using.

The following program example is available on the signal generator Documentation CD–ROM as

rs232ex1.cpp. For the full text of this program, refer to “Interface Check Using VISA and C” on

page 143 or to the signal generator’s documentation CD–ROM.

int baud=9600;// Set baud rate to 9600

ViSession defaultRM, vi;// Declares a variable of type ViSession

// for instrument communication on COM 2 port

ViStatus viStatus = 0;

// Opens session to RS-232 device at serial port 2

viStatus=viOpenDefaultRM(&defaultRM);

viStatus=viOpen(defaultRM, "ASRL2::INSTR", VI_NULL, VI_NULL, &vi);

viStatus=viEnableEvent(vi, VI_EVENT_IO_COMPLETION, VI_QUEUE,VI_NULL);

viClear(vi);// Sends device clear command

// Set attributes for the session

viSetAttribute(vi,VI_ATTR_ASRL_BAUD,baud);

viSetAttribute(vi,VI_ATTR_ASRL_DATA_BITS,8);

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Agilent Technologies E8257D PSG Instrukcja Użytkownika Strona 76