72 Chapter 2

Programming Examples

LAN Programming Examples

ViStatus status;// Declares a type ViStatus variable

ViSession defaultRM, instr;// Declares a type ViSession variable

ViUInt32 retCount;// Return count for string I/O

ViChar buffer[MAX_COUNT];// Buffer for string I/O

status = viOpenDefaultRM(&defaultRM); // Initialize the system

// Open communication with Serial

// Port 2

status = viOpen(defaultRM, "TPCIP0::19::INSTR", VI_NULL, VI_NULL, &instr);

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);

// Ask for sig gen ID string

status = viWrite(instr, (ViBuf)"*IDN?\n", 6, &retCount);

// Read the sig gen response

status = viRead(instr, (ViBuf)buffer, MAX_COUNT, &retCount);

buffer[retCount]= '\0'; // Indicate the end of the string

printf("Signal Generator ID = "); // Print header for ID

printf(buffer); // Print the ID string

printf("\n"); // Print carriage return

// Flush the read buffer

// Set sig gen power to -5dbm

status = viWrite(instr, (ViBuf)"POW:AMPL -5dbm\n", 15, &retCount);

// Query the power level

status = viWrite(instr, (ViBuf)"POW?\n",5,&retCount);

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