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D500 / Jul 98
I N T E R C O M M O D U L E
Intercom Module
(ICMD-500; optional)
Module Overview
The ICMD-500 Intercom Module is used to communicate with
other studios and locations within a broadcast facility. It is designed to
interface with other Wheatstone consoles and rackmount intercom
units. Up to eight different stations may be connected via a simple
daisy-chain hookup. The system is a party line; power for various units
can come from their own locations or from other units. A red BUSY
LED lights up whenever the system is in use.
The eight station call buttons on the lower half of the module are
used to initiate a call; when you press a call button, the button
corresponding to your location will illuminate at the other end to let the
receiver know who’s calling. He can then reply immediately, hands-
free, and you will hear him through your console’s cue speakers.
Normally you hear callers over your console’s cue speakers. However
you can also program the ICMD-500 module (via an internal dipswitch) to
perform a cue interrupt function. The caller’s voice will then appear at the
control room speakers and/or operator headphones, depending on how you
have programmed your CRD-500 module to handle CUE.
As the default mode for the system is hands-free reply, a red
PRIVACY button is provided to prevent potential eavesdropping.
When activated you can hear incoming calls but your own microphone
remains off until you disengage the button.
Your microphone signal can tap from the console’s talkback bus,
where it picks up the regular console operator’s microphone, or it can
be a separate line level input coming into the ICMD-500 module
(internally programmable). In either case, a recessed MIC trimpot at
the top of the module sets the level of your voice.
Right next to the MIC trim is a NULL trimpot. This is used to null out
your own microphone signal at your location. It is initially set at the factory
for a two-station system. However, system loading will vary depending on
configuration, and some adjustment may be necessary during initial set-up
at your location. Once set however (assuming you don’t change the number
of stations installed) this control can be left alone.
All wiring to and from the ICMD-500 module takes place at DB-25
multi-pin connectors mounted directly beneath the module on the
console mainframe’s bottom pan. There are two connectors: the upper
one (towards the console meterbridge) handles inputs; the lower
connector (near the console armrest) outputs.
A-5000 / Nov 98
3
7
4
8
2
6
1
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STATION
INTERCOM
BUSY
MIC
NULL
PRIVACY
