Description
TheES4000A is an Expansion Station for the US2000A User Station. It interfaces 4
additionalintercom channels to the US2000A, and it provides talk, listen and call but-
tonsfor the 4 additional channels. There are also 4 additional program inputs on the
backof the ES4000A, 1 for each added channel. Up to 4 ES4000A Expansion Stations
maybe connected to the US2000A to add up to 16 channels (18 channels total). The
ES4000Atypically utilizes the US2000A microphone and speaker (or microphone
headset)for communication with the added channels. The ES4000A also has individual
speakeroutputs for independent monitoring of one or more of the 4 channels if desired.
TheUS2000A / ES4000A combination can be used as a simple, multi-channel inter-
comuser station. In this configuration, the program inputs (and possibly the PA output
ofthe US2000A) are most likely not used, and the station operator has only talk, listen
andcall capability. It is also possible that advanced features of the US2000A, such as
MicKill Send, might be turned off. Alternatively, the US2000A / ES4000A can be
usedas a master station. In this application, one or more program inputs and the PA
outputmay be connected, and the program signals to the intercom channels can be
turnedon or off from the US2000A. Additionally, the Mic Kill Send feature can be en-
abled,and microphones on any channels may then be turned off from the US2000A.
4
Audiocom®
12-15VDC
+-
ES4000A
3
SPEAKERS
PROGRAM
INPUTS
4
LINE LEVEL
1VRMS
EXP
OUT
Listen Listen
Call Call
56
Talk Talk
CHANNEL 3-6 OUTPUTS
Listen
Call
4
Talk
Listen
Call
3
Talk
EXP
IN
5
6
3456
PGMVOLUME
BAL-OUT
UNBAL-IN
TELEX COMMUNICATIONS, INC.
Minneapolis, MN U.S.A.
Telex
®
321
®
54 9876
Figure 1. ES4000A Reference View (See numbered features on next page)