Specifications

3-14

Interrogating the Instrument Status

Questionable Data Status Register Group

The default setting of the Transition Filter is to pass positive transitions only. To also pass

a negative transition on bit 9, that is detect clock gain, from the Condition register to the

Event register the command is as follows:

OUTPUT 718;“STATUS:QUESTIONABLE:NTRANSITION 512”

To reset the Transition Filter to pass only positive transitions at bit 9, the command is as

follows:

OUTPUT 718;“STATUS:QUESTIONABLE:NTRANSITION 0”

Questionable Data Event Enable Register

The Questionable Data Event Enable register acts as a mask on the Questionable Data

Event register. It is enabled by sending the command “:ENABLE”. The following

example allows one or more event bits in the Questionable Data Event register to set the

QUES summary bit in the status byte.

OUTPUT 718;“STATUS:QUESTIONABLE:ENABLE 512”

This enables bit 9, Clock Loss. Whenever a clock loss condition occurs in the condition