3 connecting to an rts (telex) intercom station, Connecting to an rts (telex) intercom station – Clear-Com HLI-FBS User Manual
Page 94
9.2.3 Connecting to an RTS (Telex) intercom station
To connect your HelixNet Partyline system to an RTS intercom station (in this case,
the 2 channel MCE325 user station):
1. On the HMS-4X Main Station, configure the Module Settings for the two-wire interface module.
For the full procedure, see 5.6.2 Configuring a Two-wire interface module.
Ensure that you:
• Configure port(s) for RTS systems. You can select from two different pinouts when
connecting to an RTS two-wire system:
RTS pinout option
Description
RTS Audio Pin 2
Pin 2 is used for both power and audio.
RTS Audio Pin 3
Pin 3 is used for audio (Pin 2 is used for
power only).
Table 38: Configuring Module Settings: RTS pinout options
• Enable auto-nulling. Auto-nulling helps to reduce echo while talking on a two-wire audio
system.
2. Physically connect the HMS-4X Main Station to the RTS intercom station (MCE325).
The two channels of RTS TW intercom must be split prior to connection with either of the Two-
wire module ports. RTS Audio Pin 2 carries the power that is required for the Two-wire module.
Powering the connection:
You must power the connection between the systems using either a dedicated power supply
(such as the PK-7, PS-702, or PS-704), or a powered Encore Main Station (such as the MS-702
or MS-704) or an RTS PSU.
Tip:
For more information about the PK-7 or PS-70x power supply devices from Clear-Com, see
Connecting to the MCE325 device:
There are three 3-pin XLR connectors on the rear panel of the MCE325 device. In two-wire mode:
• The left and right-hand connectors are used for intercom channels 1 and 2 input/
output.
• The center connector is used for channels 3 and 4 input / output.
• Connect to the selected channel using standard microphone cabling.
Note:
The MCE325 is designed for use with intercom lines with a 200-ohm line terminating
impedance. A 200 ohm termination plug is connected to the center 3-pin XLR connector
to prevent channels 3 and 4 from oscillating when the MCE325 is in two-channel mode.
92
HelixNet Partyline User Guide