24 Installation
MCE-325 Programmable User Station
Bosch Security Systems, Inc.
Technical Manual
F.01U.193.228
Rev. 13
NOTE:
See Figure 12 on page 37 for a summary of how the channel selector buttons work for the various configurations.
The MCE-325 is typically supplied with a termination plug inserted into J10. This plug terminates CH 3 and CH
4 with 200
Ω
to prevent oscillations 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 “Operation” on page 33.
ISO (DS5)
The MCE-325 may be used with an RTS Model VCP-6A, VCP-12A, or VCP-12B Control Station to permit private
conversation between the MCE-325 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 MCE-325 is muted, and a private line is established
between the MCE-325 operator and the camera operator. See “ISO Connection” on page 30 for wiring information.
Remote Talk-off (DS7)
The MCE-325 is capable of generating and transmitting an inaudible, 24kHz 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” on page 35).
VOX (DS8)
Dip switch DS8 turns the voice activates 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 3.
Internal programming for the various intercom line configurations
DIP SWITCHES
JUMPERS
DS1
DS2
DS3
J6
J7
J19
J20
Configuration 1
: Two (2) 2-wire lines (CH1 & CH2) (Default Configuration)
Off
Off
Off
Pins 2 & 3 Shorted
Pins 2 & 3 Shorted
Pins 2 & 3 Shorted
Pins 2 & 3 Shorted
Configuration 2
: Three (3) Or Four (4) 2-wire Lines (Ch1, Ch2, Ch3, Ch4)
Off
Off
On
Pins 2 & 3 Shorted
Pins 2 & 3 Shorted
Pins 2 & 3 Shorted
Pins 2 & 3 Shorted
Configuration 3
: One (1) 2-wire Line (Ch1) One (1) 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) 2-wire Lines (Ch1 & Ch2) One (1) 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) 2-wire Lines (Ch3 & Ch4) One (1) 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 (2) 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
