8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
239
VISA Programming Examples
6
How to Co-ordinate Two Modules
This example shows the interaction of two modules in the same frame.
Install a Power Sensor in Slot 1 and a Laser Source in Slot 2 and connect
the Laser Source output to the Power Sensor input, before executing this
example.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <visa.h>
/* function prototypes for this examples */
/* function for a simple error handling explained in example
1 */
void checkError(ViSession session, ViStatus err_status );
void main (void)
{
ViStatus errStatus; /* returned error code from
visa call */
ViSession defaultRM; /* default visa resource
manager variable */
ViSession vi; /* current session handle */
ViChar replyBuf[256]; /* buffer holding answers of
the instrument */
ViChar c; /* used in the keyboard wait
loop */
ViInt32 i; /* loop counter */
ViInt32 cmdDone; /* return value for OPC command
*/
/* First get initialized the visa library (see example 1)
*/
errStatus = viOpenDefaultRM (&defaultRM);
if(errStatus < VI_SUCCESS)
{
printf("Failed to open VISA Resource manager\n");
exit(errStatus);
}
/* Open session to GPIB device at address 20; */
