Agilent Technologies E3633A N o t e N o t e, Remote Interface Reference System-Related Commands

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Chapter 4 Remote Interface Reference

System-Related Commands

OUTPut:RELay {OFF ON}
This command sets the state of two TTL signals on the RS-232 connector. These
signals are intended for use with an external relay and relay driver. The TTL
output is available on the RS-232 connector pin 1 and pin 9. When the
OUTPut:RELay state is ‘‘ON’’, the TTL output of pin 1 is high (4.5 V) and pin
9 is low (0.5 V). The levels are reversed when the OUTPut:RELay state is
‘‘OFF’’. At *RST, the OUTPut:RELay state is OFF.
TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing
two jumpers inside the power supply. See the Service Guide for more information.
Do not use the RS-232 interface if you have configured the power supply to output
relay control signals. Internal components on the RS-232 circuitry may be damaged.
OUTPut:RELay?
This command returns the state of the TTL relay logic signals. See also
OUTP:REL command.
SYSTem:BEEPer	4
This command issues a single beep immediately.

SYSTem:ERRor?

This command queries the power supply’s error queue. When the front-panel ERROR annunciator turns on, one or more command syntax or hardware errors have been detected. Up to 20 errors can be stored in the error queue. See ‘‘Error Messages’’ for a complete listing of the errors in chapter 5.

•Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the first error that was stored. When you have read all errors from the queue, the ERROR annunciator turns off. The power supply beeps once each time an error is generated.

•If more than 20 errors have occurred, the last error stored in the queue (the most recent error) is replaced with -350, ‘‘Too many errors’’. No additional errors are stored until you remove errors from the queue. If no errors have occurred when you read the error queue, the power supply responds with

+0, ‘‘No error’’.

•The error queue is cleared when power has been off or after a *CLS (clear status) command has been executed. The *RST (reset) command does not clear the error queue.

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