112 Chapter 2
Programming Examples
RS-232 Programming Examples
if(status){// If problems, then prompt user
printf("Could not open ViSession!\n");
printf("Check instruments and connections\n");
printf("\n");
exit(0);}
// Set timeout for 5 seconds
viSetAttribute(instr, VI_ATTR_TMO_VALUE, 5000);
// Asks for sig gen ID string
status = viWrite(instr, (ViBuf)"*IDN?\n", 6, &retCount);
// Reads the sig gen response
status = viRead(instr, (ViBuf)buffer, MAX_COUNT, &retCount);
buffer[retCount]= '\0';// Indicates the end of the string
printf("Signal Generator ID: "); // Prints header for ID
printf(buffer);// Prints the ID string to the screen
printf("\n");// Prints carriage return
// Flush the read buffer
// Sets sig gen power to -5dbm
status = viWrite(instr, (ViBuf)"POW:AMPL -5dbm\n", 15, &retCount);
// Querys the sig gen for power level
status = viWrite(instr, (ViBuf)"POW?\n",5,&retCount);
// Read the power level
status = viRead(instr, (ViBuf)buffer, MAX_COUNT, &retCount);
buffer[retCount]= '\0';// Indicates the end of the string
printf("Power level = ");// Prints header to the screen
printf(buffer);// Prints the queried power level
printf("\n");
status = viClose(instr);// Close down the system
status = viClose(defaultRM);
return 0;
}
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