Interfaces and Connectible Terminals
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The “Doorphone” intercom system can be connected to any a/b port.
However, you can use only one intercom system of the “Doorphone” type
with the Forum 5004/5008/5012 communications system.
For details on installing and configuring the “Doorphone” intercom system,
refer to the product user guide.
The intercom system should be installed by qualified personnel only as
sensor/actor contacts will need to be connected to the “Doorphone” module.
Technical Information
The a/b ports have been implemented as RJ45 sockets. Each of the devices
listed above can be connected to the a/b interface by means of a two-wire
1:1 cable. A two-wire cable connected to an a/b port can be up to 1000 m
long, provided a 0.4 mm twisted-pair cable is used.
The 25 Hz / 40 V AC ringing voltage of the eight interfaces is supplied by the
interface card.
The short-circuit-proof feed voltage is 36 V ± 10%.
Pin assignment
a/b interface pin assignment
The following Table explains the a/b interface pin assignment.
Pin number
Assignment
1
Not used
2
Not used
3
Not used
4
Channel a
5
Channel b
6
Not used
7
Not used
8
Not used
1 2 3 4 5 6 7 8
