manual

MODEL 91XX/97XX CONFIGURATION MANUAL
202
Terminal is Turned Off or Power Has Failed
If the terminal is turned off, no calls will be made. While an obvious point,
it means that for this feature to be of any value, the terminal must always
remain on.
Communications System Has Failed
A failure of any piece of the communications system will result in missed
calls. This includes the terminal modem, the phone line to the terminal, and
any intermediate telecommunications providers.
Terminal Was Reset or Power Cycled
Since the interval timer is reset when the terminal is reset, a scheduled call
may not occur at the expected time.
To realize the benefits of the Heartbeat Message, the host must be pro-
grammed to monitor the interval between calls from the terminal. It is
important to note, though, that the host interval threshold should be set to
a value greater than that programmed at the terminal. A practical guideline
is at least twice the terminal interval. This allows for Heartbeat Message
calls that are delayed because the terminal is in Management mode, or calls
skipped because of a system reset.
E
RROR CONDITIONS:
There are no error conditions directly associated with this function.