dose of the device does not react to the C++ code

Hello.

I have meassuring keithley 237 system, connected to the port COM4.

And I commands manual keithley insturment.

When I use assistant LabView Instrument IO and put in "query and analyze" the steps of these commands, the device reacts as it should.

But when I try to write and run my own C++ code, device does not react.

just no reaction at all!

Maybe someone can help me and tell me what's missing.

Here's my C++ code:

#include #include "visa.h"

using namespace std;int main (int argc, char *argv[]){       ViStatus status;    ViSession defaultRM, instr;    /* Open Default RM */    status = viOpenDefaultRM(&defaultRM);

    if (status != VI_SUCCESS) {        /* Error Initializing VISA...exiting */             return -1;        }

    /* Access other resources */    status = viOpen(defaultRM, "ASRL4::INSTR", VI_NULL, VI_NULL, &instr);

    // here I send commands to device    viPrintf(defaultRM, "F1,0X");           //  "F1,0X" and all another symbols in "" are just commands from keithley manual.          viPrintf(defaultRM, "B1E-6,0,X");    viPrintf(defaultRM, "L11,0X");    viPrintf(defaultRM, "P3X");    viPrintf(defaultRM, "O0X");    viPrintf(defaultRM, "N1X");    viPrintf(defaultRM, "H0X");

    viClose(instr);    viClose(defaultRM);

return 0;}

Hello

There is an obvious problem in your code: viPrintf () accepts as a first parameter a session handle, which is "instr" variable returned by viOpen () in your case. Using the default resource manager leads to incorrect results (BTW, you must add to your code an error checking: I expect viPrintf () to return VI_ERROR_INV_OBJECT or similar error).

As long as an additional indicator, I noticed that you use no termination for your messages: you should check in the documentation for the device if you need to add a stop character (the instruments most want a '\r' or '\r\n' sequence at the end of the messages to accept).

Tags: NI Software

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dose of the device does not react to the C++ code

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