Interfaces and Connectible Terminals a/b Ports
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The intercom system should be installed by qualified personnel only as sensor/
actor contacts will need to be connected to the “DoorLine” module.
5.4.2 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 6500 m long, provided it is a 0.6 mm twisted-pair cable, or up
to 3000 m if a 0.4 mm twisted-pair cable is used.
The 50 Hz/40 V AC ringing voltage of the eight interfaces is supplied by the
interface card.
Pin Assignment
a/b interface pin assignment
The following Table explains the a/b interface pin assignment.
Pin Number Assignment
1Not used
2Not used
3Not used
4Channel a
5Channel b
6Not used
7Not used
8Not used
12345678
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