Agilent Technologies 4294A Service Manual download pdf (Page 134)

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134 Chapter 10

Handling Errors

Sample program for error handling

Example 10-1 is a sample program for detecting an error via SRQ. This program is saved

in the file “error.bas” on the sample program disk.

This program performs necessary settings for SRQ, intentionally sends a command that the

4294A does not support to cause an error, then handles the error occurred. In the error

handling, the error is identified, its error number and message are displayed followed by a

message showing that the program is aborted.

Lines 30 to 90 Identifies the external controller and Instrument BASIC and sets the

GPIB address and the select code.

Lines 110 to 120 Sets bit 2, 3, 4 and 5 of the standard event status register to be enabled

and sets bit 5 of the service request enable register to 1.

Lines 130 to 150 Clears the status byte register, standard event status register, and error

queue.

Lines 170 to 180 Defines the destination for branching by SRQ interruption and enables

the SRQ interruption.

Lines 190 to 260 Sets a measurement parameter, a sweep start value, and a sweep stop

value. An error occurs here because an unsupported command is used

to set the start value.

Lines 290 to 300 Performs error handling. The number and message accompanied with

the error is read out.

Lines 310 to 330 Displays a message showing an error has occurred, the error number,

error message, and an another message telling that the program is

aborted.

Line 350 Displays a message for normal termination of the program. Note that

this will not be displayed unless the program is modified to employ an

appropriate command for setting the start value.

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