Waiting For Srq; Sample Programs; Program 1: Var1 And Var2 Sweep (System Mode) - Keithley 4200A-SCS Reference Manual

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Section 9: Keithley External Control Interface (KXCI)

Waiting for SRQ

Instead of serial polling the 4200A-SCS to detect an SRQ, you can monitor the service request line.

When an SRQ occurs, the SRQ line goes true. You can use the following C language programming

routine to hold up program execution until an SRQ occurs.

send(addr, "DR1", &status);

while(!srq());

The first statement enables service request for data ready. The second command holds up program

execution until the SRQ (data ready) occurs.

Three sample programs (using the C language) are provided to demonstrate system control using an

external computer communicating through GPIB. For these programs, configure KXCI as follows:

GPIB address: 17

Delimiter: Comma

The following program demonstrates how to program the 4200A-SCS to perform a VAR1 and VAR2

sweep. It assumes that channels 1 through 4 of the KXCI are configured for the SMU function.

MAXLEN = 2048;

// Initialize card:

initialize(10, 0);

// Set speed to 0.01 PLC, clear buffer, and

// enable service request for data ready:

send(addr, "IT1 BC DR1",&status);

// Channel definition for SMU1; constant common:

send(addr, "DE CH1,'VE','IE',3,3", &status);

// Define SMU2 for VAR2 I sweep:

send(addr, "CH2,'VB','IB',2,2", &status);

// Define SMU3 for VAR1 V sweep:

send(addr, "CH3,'VC','IC',1,1", &status);

// Define SMU 4 to be off:

send(addr, "CH4", &status);

// Define V-sources and V-meters to be off:

send(addr, "VS1;VS2;VM1;VM2", &status);

Model 4200A-SCS Parameter Analyzer Reference Manual

4200A-901-01 Rev. C / February 2017