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RM-325
User Station
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 rackmounted with optional rackmount hardware.
Talk Features
There is a separate talk button with talk-on indicator for each
channel. Talk buttons feature dual-action, momentary/latch-
ing talk operation: a button may be pressed and held to talk,
then released when nished, 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. Inter-
nal 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.
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 connec-
tor. 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 congure the car-
bon 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 ¼-inch stereo
phone jack (PGM) or via the AUX connector.
Line/Local Power Options
By default, the RM-325 receives operating power from inter-
com channel 1. Alternatively it may be congured 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.
Features
Line Drawing