STE 80722
– 91 –
: Alarm history acquisition with message (Host computer → Controller) AH
AH
The AH command is used to transfer the alarm history with message of the
controller to the host computer.
For details on the contents of the alarm history, see the FL (File) command.
Protocol
Controller Host computer
(1) Normal response
FL, alarm history
(2) Error (Cannot receive request)
NG
Negative response
AH
OK
Affirmative response
When currently occurring alarm
reception is discontinued midway:
NG
Discontinuation request
Note
Put in a delay of about 50 msec until the host computer sends an affirmative
response OK to the controller after the host computer has received the currently
occurring alarm.
If there are many alarm histories, all alarm histories may not be able to be received
by one communication. To receive continuing alarm histories, send an affirmative
response OK during each reception.