HelixNet | User Guide
n Unmute
n Mute (default)
4. To confirm the selected setting, press the rotary control.
5. Auto-nulling helps to reduce echo while talking on a two-wire audio system. To start Auto-
nulling on the selected port:
a. From the third menu, select Auto-Nulling.
b. From the fourth menu, select Start.
Note: Auto-nulling is only applicable to two-wire audio. All Talk routes/keys must be
disabled before Auto-nulling can commence. If an echo persists, ensure all Talk
routes are disabled and re-null the system.
6. The Two-wire interface module is set for Clear-Com systems by default. However, you can
also set the two-wire ports for use with RTS analog Partyline systems. If you are connecting to
an RTS system, you also have a choice of two different pinouts:
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).
Note: For detailed pinout information, see HMS-4X Main Station rear
panel: Interface modules..
To configure the port for either Clear-Com or RTS systems:
a. From the third menu, select Mode.
b. From the fourth menu, select one of the following:
l Clear-Com
l RTS Audio Pin 2
l RTS Audio Pin 3
c. To confirm the selected setting, press the rotary control.
7. To set the Input Gain:
a. From the third menu, select Input Gain.
b. From the fourth menu, select one of the following:
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