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.DTRHIGH and

.DTRLOW

or

.DTRHIGH.n and .DTRLOW.n internal events

where n = host port number

The .DTRLOW event occurs automatically on the high to low transition of the DTR signal on a Host port. The .n indicates the port number. This may be caused by a cable being removed from a port or by the attached equipment being switched off.

The .DTRHIGH event occurs automatically on the low to high transition of this same signal. This can be caused by attaching a cable to a port. These events can be used to detect if the HP server or host has lost power, or if the Terminal server has been disconnected from the maintenance port.

Alarm/Event

Action Routine

Parameters

Comments

.DTRLOW

SCHEDULE

2 PHONHOME

 

.DTRHIGH

CANCEL

.DTRLOW

 

This example schedules a PHONHOME to report the alarm two minutes after DTR is lost (transitions from high to low). If DTR is re-established (DTR goes high), the .DTRHIGH alarm occurs and cancels the action PHONHOME Action Routine. Since no port number is specified, this event will occur when DTR is lost on any port.

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HP A5799A manual Dtrhigh, Dtrlow, DTRHIGH.n and .DTRLOW.n internal events