Chapter 5: Installation
130 EST3X Technical Reference Manual
3-MODCOM Modem Communicator module
The 3-MODCOM Modem Communicator is a hardware layer option card that
connects the EST3X system to a switched telephone network. The module has
two 8-position modular jacks for connecting two loop-start lines.
The 3-MODCOM can support 255 accounts and communicate with 80 receivers
in any of the following protocols:
• Contact ID
• SIA DCS
• SIA P2 (3/1 Pulse Format)
• SIA P3 (4/2 Pulse Format)
The 3-MODCOM configuration settings made in the 3-SDU define the line
properties, receiver attributes, account parameters, and transmission details.
Line types
The 3-MODCOM can be configured as a one- or two-line dialer, a modem, or a
modem and one- or two-line dialer.
Note: For UL listed or FM approved installations, you must configure the
3-MODCOM as a two-line dialer. Both lines must have supervision (line-cut
detection) selected.
Central Monitoring Station dialing
The 3-MODCOM electronically dials receivers in the CMS using either pulse or
tone dialing, as specified in the 3-SDU. The module dials the stored CMS
telephone number using the same digits that would be used if a person were
dialing from the premises with an ordinary telephone.
Call timers
The 3-MODCOM sends messages in order of their priority. Messages may
include device and user ID information regarding events, such as openings,
closings, alarms, and tamper or trouble events. The module waits for
acknowledgement that each message sent has been received. Where
necessary, the 3-MODCOM can be configured to begin dialing without waiting for
a dial tone. This option is used in areas where the telephone line has an absent
or erratic dial tone.
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