China Electronics Technology Instruments AV3672 Series, User Manual

Page: 292 / 424

9 Remote control
9.3 Basic Programming Method of VISA Interface
288
9.3.7 Command Synchronization
The method of command synchronization is introduced below, taking the sweep process as an example.
voidSweepSync()
{
ViState state;
longretCnt;
ViEventTypeetype;
ViEventeevent;
int stat;
charOpcOk [2];
/*********************************************************************/
/* Command INITiate[:IMMediate] start single sweep ( closed in continuous sweepINIT:CONT OFF)*/
/* Execute next command of command buffer zone after single sweep */
/*********************************************************************/
state = viWrite(analyzer, "INIT:CONT OFF", 13, &retCnt);
// Method 1 of waiting for stop of sweep: use *WAI
state = viWrite(analyzer, "ABOR;INIT:IMM;*WAI", 18, &retCnt);
// Method 2 of waiting for stop of sweep: use *OPC
？
state = viWrite(analyzer, "ABOR;INIT:IMM; *OPC?", 20, &retCnt);
state = viRead(analyzer, OpcOk, 2, &retCnt); //Wait for*OPC and return to “1”
// Method 3 of waiting for stop of sweep: use *OPC
// To enable GPIB service request, set "Disable Auto Serial Poll" as "yes"
state = viWrite(analyzer, "*SRE 32", 7, &retCnt);
state = viWrite(analyzer, "*ESE 1", 6, &retCnt); // enable service request ESR
// set event enabling bit to complete operation
state = viEnableEvent(analyzer, VI_EVENT_SERVICE_REQ, VI_QUEUE, VI_NULL);
// enable SRQ event
state = viWrite(analyzer, "ABOR;INIT:IMM;*OPC", 18, &retCnt);
// start sweep synchronously with OPC
state = viWaitOnEvent(analyzer, VI_EVENT_SERVICE_REQ, 10000, &etype, &eevent)
// wait for service request
state = viReadSTB(analyzer, &stat);
state = viClose(eevent); // close event handle
// prohibit SRQ event
state = viDisableEvent(analyzer, VI_EVENT_SERVICE_REQ, VI_QUEUE);
// main program continues……