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Programming the Status Register System

Accessing Status Register Information

Chapter 3108

If a program enables the controller to detect and respond to service requests, it should

instruct the controller to perform a serial poll when SRQ is true. Each device on the bus

returns the contents of its status byte register in response to this poll. The device whose RQS

bit is set to 1 is the device that requested service.

NOTE When you read the signal generator’s Status Byte Register with a serial poll,

the RQS bit is reset to 0. Other bits in the register are not affected.

If the status register is configured to SRQ on end-of-measurement and the

measurement is in continuous mode, then restarting a measurement (INIT

command) can cause the measuring bit to pulse low. This causes an SRQ when

you have not actually reached the “end-of-measurement” condition. To avoid

this, do the following:

1. Send the command INITiate:CONTinuous OFF.

2. Set/enable the status registers.

3. Restart the measurement (send INIT).

Status Register SCPI Commands

Most monitoring of signal generator conditions is done at the highest level, using the IEEE

488.2 common commands listed below. You can set and query individual status registers using

the commands in the STATus subsystem.

*CLS (clear status) clears the Status Byte Register by emptying the error queue and

clearing all the event registers.

*ESE, *ESE? (event status enable) sets and queries the bits in the Standard Event Enable

*ESR? (event status register) queries and clears the Standard Event Status Register

which is part of the Standard Event Status Group.

*OPC, *OPC? (operation complete) sets the Standard Event Status Register to zero so it

can monitor the completion of all commands. The query stops any new commands from

being processed until the current processing is complete, then returns a ‘1’.

*PSC, *PSC? (power-on state clear) sets the power-on state so that it clears the Service

Request Enable Register, the Standard Event Status Enable Register, and device-specific

event enable registers at power on. The query returns the flag setting from the *PSC

command.

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Agilent Technologies PSG Manual de Instruções Página 122