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Chapter 5 Command Reference
Operating Status
5-54 Operating and Programming Guide
Monitoring Status/Alarm Conditions ___________
(continued)
!
Clearing and Presetting Alarms ______________________________
When the *CLS command clears the event status registers and error queue, the
Receiver’s Alarm LED and Alarm BITE output will no longer indicate that
there was a reason to alarm. Furthermore, the Receiver is then ready to detect
a new alarm.
Context Dependencies
In the 59551A, the error queue (and corresponding serial port prompt) of the
I/O port which transmitted *CLS will be cleared.
Side Effects
The Alarm LED is extinguished.
The Alarm BITE output is set “inactive/off.”
The prompt of the serial I/O port (which transmits *CLS) reflects error queue
clearing.
The event status registers are cleared.
The error queue (and corresponding serial port prompt) of the I/O port which
transmitted *CLS will be cleared.
Theory
The *CLS command clears the event status registers and error queue.
(They are also cleared at power-up.)
Since the Alarm Condition register summarizes the event registers, it is
cleared as a result of the clearing of all of the event registers.
The alarm remains active even after the condition that caused it has gone
away.
If the condition that caused the alarm to occur is still set, a new alarm cannot
be detected until the condition clears and resets.
This command has no effect on condition, enable, or transition filter registers.
*CLS
Clears the current alarm and prepares the Receiver for the next
alarm activation.
EVENT