Telex MCE325 User Manual download pdf (Page 25)

2-5

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.)

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

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Telex MCE325 User Manual Page 25