7 Remote Communications
7.2 Call in and call out
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Modem items are shared between the scheduled and alarm call in features. If the modem requires an
initialization string it must be set into item 491 along with an Init Delay (Item 821). The initialization delay
is applied so that the modem, having just been powered up, has a chance to stabilize before being sent
the initialization string. A dial prefix must be configured in item 492 and a hangup string in 494. The
Dialing Delay will take place following the issuance of the initialization string. Call in sequence, Trigger
Type and retry parameters are also shared between scheduled and alarm calls. Those will be discussed
later.
7.2.1.2 Scheduled Call In
The EC350 can initiate a call at a preset time. The time may have been manually specified, but on an
ongoing basis the host(s) is responsible for the schedule. At the end of each call the host is must set item
values that determine when the next call is to take place. That time will always be contained in items 334
and 335. Items 338 and 337 indicate the result of the latest call ( or call attempt ). If only one host exists,
its phone number is set in item 339. If a second host exists, its number is set in item 1030. To enable
scheduled call in, at least phone number must be configured and item 333 must be set to either Alarm
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