7 Remote Communications
7.2 Call in and call out
Honeywell 2024
221
(where 1 and 2 represent the first and second phone numbers, S denotes success, F denotes failure
)
7.2.1.6 Retry Timing
Not all call failures are resolved with ‘retries’. ‘Retries’ is defined as the termination of the current attempt
and the scheduling of another attempt some minutes or hours hence. In some cases the EC350 may try to
resolve the failure immediately. If, for instance, an initialization string is sent to the modem but no positive
response is received within several seconds, it will simply send it again. If several initialization attempts
fail, then it will be deemed hopeless (for now) and a future retry will be scheduled. The same is true if a
dial string goes unanswered. But after a certain point another immediate attempt would be futile and a
future retry is scheduled.
There are three retry timing parameters – two delays ( A and B ) and a counter. For any given trigger
(schedule or alarm ) the first retry will be scheduled to take place Retry A minutes in the future. Retry A will
be used for subsequent retries until Modem Retry A count is exhausted. The next ( and subsequent )
failures will be scheduled at intervals of Retry B minutes. Once the call finally succeeds ( or another
trigger occurs ) the counter, and thus the retry sequence, will be reset.
7.2.1.7 LCD indications
When a call is triggered, the information on the 2nd and 3rd lines of the LCD will be replaced with
messages indicating the progression of the call, such as ‘INIT MODEM’, ‘DIALING #’, ‘DIAL FAILED’,
‘CONNECTED’, ‘WAIT FOR CONN RESPONSE’, ‘CONNECTED’, ‘WAITING +-+CLRALMS’, and ‘HOST
SYSTEM CONNECTED’.
To Next Page
Loading...
