ICM-400 Series Intercom Stations
Document IM-ICM-400-2.14
1999 Harding Instruments - Printed in Canada
1.
Intent & Scope
This document describes the installation procedure for the ICM-400 series intercom stations. The ICM-400 series
intercom stations include intercom stations types ICM-420, ICM-421, ICM-430, ICM-431, and ICM-490. The ICM-
4x1 stations include a LED while the ICM-4x0 stations do not. The ICB-400 Intercom Board is used to convert a 45
ohm loudspeaker into a 400 series intercom station. Included is a description on connecting an ICM-420 and ICM-
320 to create a two sided door primary/secondary pair
2.
Description
The ICM-400 series of intercom stations include all intercom stations that are connected to a DXI system via a
SAB-400 or SAB-401 station audio board, or to a DXL system via a SCC-400 or SCC-401 station control card. Each
ICM-400 series intercom station is connected to the system with a single shielded twisted pair cable that carries all
the microphone, loudspeaker, switch, and LED indicator signals.
The ICM-400 series intercom stations can be ordered in several configurations. These include:
(i)
0, 1 or 2 switches. These switches are mounted on the faceplate and internally terminated. They can be
used for call request, program music selection, or other functions. The terminations allow the system to
detect open or short line faults.
The switch information is multiplexed with the audio signals over a single pair of wires.
(ii)
The LED stations, ICM-421 and ICM-431, are used with SAB-401 station audio board or SCC-401 station
control card. The LED is used to indicate call request status or active call status. Again LED status
information is multiplexed over the audio pair.
(iii)
A cord jack can be specified in place of the standard faceplate switch on the intercom stations.
(iv)
An Apem switch, red mushroom button switch or mini-piezo switch can be ordered for the intercom
stations.
(v)
A piezo-electric switch can be specified in place of the standard faceplate switch on the ICM-430 or ICM-
431
(vi)
The switch contacts of a switch can be made available on a four-pin header. With external field wiring the
switch can then be used to operate an external device, i.e. open a door; turn on lights, etc. External
contacts can also be connected to this four-pin header. This allows external equipment to activate the
station switches and place call requests or act as a switch to change the music selection.
