
Pub. 42004-460A
Model 400-003 IEC/ATEX Zone 1 RigCom Station Page: 10 of 16
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TB4 - Audio and Low Voltage Control Terminal Block
The following is a list of connections for the low voltage control and audio signal terminal block, TB4:
Name Pin No. Description
Aux Mic+ 1 Positive terminal for auxiliary microphone (optional).
Aux Mic− 2 Negative terminal for auxiliary microphone (optional).
Ext Cont+ 3 Talk/listen control signal for Master/Slave operation.
No connection in Common Line mode.
Ext Cont− 4 Ground reference for talk/listen control signal for Master/Slave operation.
No connection in Common Line mode or UNBAL audio configuration.
Shield 5 Ground reference for shield terminations.
Audio+ 6 Positive of the audio line during 600-ohm or 15-kilohm termination
configuration.
Audio− 7 Negative of the audio page line during 600-ohm or 15-kilohm termination
configuration.
Footswitch+ 8 Positive of optional auxiliary footswitch operating as local push-to-talk switch.
Footswitch− 9 Negative of optional auxiliary footswitch that operating as local push-to-talk
switch.
P1 - Front Cover Wire Harness Connections
Plug in the front cover wire harness connector at P1. Refer to Figure 8.
Figure 8.
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