Agilent-technologies N5183A MXG Manual de usuario descargar pdf (Pagina 146)

136 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide

Programming Examples

RS-232 Programming Interface Examples (ESG/PSG/E8663B Only)

ViSessiondefaultRM, instr;// Declares type ViSession variables

ViUInt32retCount; // Return count for string I/O

ViCharbuffer[MAX_COUNT];// Buffer for string I/O

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

// Open communication with Serial Port 2

status = viOpen(defaultRM, "ASRL2::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);

// 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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Agilent-technologies N5183A MXG Manual de usuario Pagina 146