Telex MCE325 manual Front Panel Setup Mode Lock-out DS4, Remote Talk-off DS7

Table 2.3 Internal programming for the various intercom line configurations.

DIP SWITCHES			JUMPERS
DS1	DS2	DS3	J6	J7		J19	J20
Configuration 1: Two 2-wire lines (CH 1& CH 2).					(Default configuration.)
Off	Off	Off	Pins 2 & 3 shorted	Pins 2 &	3 shorted	Pins 2 & 3 shorted	Pins 2 & 3 shorted
Configuration 2: Three or four 2-wire lines (CH 1, CH 2, CH 3, CH 4).
Off	Off	On	Pins 2 & 3 shorted	Pins 2 &	3 shorted	Pins 2 & 3 shorted	Pins 2 & 3 shorted
Configuration 3: One 2-wire line (CH 1);				One 4-wire line (CH B).
Off	On	Off	Pins 2 & 3 shorted	Pins 1 &	2 shorted	Pins 2 & 3 shorted	Pins 1 & 2 shorted
Configuration 4: Two 2-wire lines (CH1 & CH2); One 4-wire line (CH B).
Off	On	On	Pins 2 & 3 shorted	Pins 1 &	2 shorted	Pins 2 & 3 shorted	Pins 1 & 2 shorted
Configuration 5: Two 2-wire lines (CH 3 & CH4); One 4-wire line (CH A).
On	Off	On	Pins 1 & 2 shorted	Pins 2 &	3 shorted	Pins 1 & 2 shorted	Pins 2 & 3 shorted
Configuration 6: Two 4-wire lines (CH A & CH B).
On	On	On	Pins 1 & 2 shorted	Pins 1 &	2 shorted	Pins 1 & 2 shorted	Pins 1 & 2 shorted

NOTE See Table 3.1for a summary of how the channel selector buttons work for the various configurations. The MCE325 is typically supplied with a termination plug inserted into J10. This plug terminates CH 3 and CH 4 with 200 ohms to prevent oscillation when these channels are not used. When the channels are used, this termination plug should be removed.

Front Panel Setup Mode Lock-out (DS4)

DIP switch DS4 may be set to lock out the front panel programming and prevent changes. Front panel programming is described in Section 3, Operation.

ISO (DS5)

The MCE325 may be used with an RTS Model VCP6A, VCP12A, or VCP12B Control Station to permit private conversation between the MCE325 operator and a camera operator. When ISO mode is engaged, either talk, or talk and listen (depending on the setting of DS5) for all other channels connected to the MCE325 will be muted, and a private line will be established between the MCE325 operator and the camera operator. See “ISO Connection” for wiring information.

Remote Talk-off (DS7)

The MCE325 is capable of generating and transmitting an inaudible, 24 kHz signal on an intercom channel. This signal is used to turn off the microphones on any remote stations on the channel (stations with remote talk-off feature only). This feature is useful when an unattended user station with an activated microphone is introducing unnecessary noise into a line. DIP switch DS7 enables/disables this feature. When remote talk off is enabled, the talk-off signal is activated using the CALL button on the front panel. (for Operation see “Using the Talk-Off Feature”.)

VOX (DS8)

DIP switch DS8 turns the voice activated microphone circuit on or off. Voice activation can be used with the panel microphone, a headset, or a remote microphone connected at the rear panel. (There is no adjustment for VOX sensitivity.)

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