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DESCRIPTION AND SPECIFICATIONS
1.1 DESCRIPTION
1.1.1 GENERAL
The RM-325 is a two-channel intercom user station for
the RTS TW Intercom System. It is designed for use with
a headset, and it can be placed on a desktop, or rack
mounted with optional rack mount hardware.
1.1.2 FEATURES
Talk Features: There is a separate talk button with
talk-on indicator for each channel. Talk buttons
feature dual-action, momentary/latching talk
operation: a button may be pressed and held to talk,
then released when finished, or the button may be
tapped once to turn talk on and then tapped again to
turn talk off. Latching operation may be
independently deactivated for each channel via an
internal DIP switch. The channel 1 and 2 talk buttons
may also be independently disabled via internal DIP
switches. Additionally, there is a an external talk
switch input (for footswitch etc.) for each channel via
the Aux connector.
Listen Features and Headsets: There is a separate
listen volume control for each channel, and a listen
volume control for the program input. The RM-325
accepts a stereo, dynamic-mic headset or a monaural,
carbon-mic headset. Default operation is set for
stereo listen, with channel 1 assigned to left
headphone, channel 2 to right headphone, and
program input to both headphones. Internal jumpers
permit all signals to be combined for monaural
listening. Internal jumpers also permit the program
audio to be assigned left or right when using a stereo
headset.
Call
Talk Off
Figure 1. RM-325 Front and Rear Panel Reference View
CH 1
1
2
Volume
Talk
Talk
PUSH
LINE INPUT
LINE LOOP
Microphone and Microphone Switch Features: The
Dynamic-mic headset connector features a balanced,
dynamic mic input, and a mic on/off switch input. A
remote mic on/off switch may also be connected via
the Aux connector. There is an internal mic-sensing
circuit for the carbon-mic headset jack, which
activates the mic circuit when the carbon mic is on.
An internal jumper can configure the carbon mic
input exclusively for use as a mic on/off switch input
(monaural headphone output is supported in either
case). The microphone audio is available as an
unswitched (hot, or always on) unbalanced output at
the Aux connector.
Talk-off (Mic Kill) Signaling: the RM-325 can send
and receive Talk Off signals. Talk-off send and
receive can be independently enabled/disabled via
internal DIP switches.
Call Signaling: There is a call button and indicator,
and the RM-325 can send and receive call signals.
There is also an internal setup switch to disable call
send.
Program Input: Balanced program audio may be
input via the 1/4-inch stereo phone jack (PGM) or via
the AUX connector.
Line/Local Power Options: By default, the RM-325
receives operating power from intercom channel 1.
Alternatively it may be configured to receive power
from channel 2 or from a local, 24 VDC power
source connected to the AUX connector.
Sidetone: There is a separate sidetone control for
each intercom channel. These adjust the level of the
station operator's own voice in the headphones when
talking.
CH 2
Volume
PGM
Volume
1
2
Sidetone
PGM
DYN MIC
Headset
CARB MIC
Headset
™
RM-325 User Station
TELEX COMMUNICATIONS, INC.
MADE IN USA
AUX
RM-325 User Manual
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