Bosch Security Systems, Inc.
Technical Manual
F.01U.193.228
Rev. 13
CHAPTER 3
Operation
General
The front panel buttons have different functions when the MCE-325 is switched from operating mode to setup mode. Legends
on the buttons indicate their operating mode functions; legends under the buttons indicate their setup mode functions. All of
the front panel buttons are pre-programmed for a certain type of operation. This is the default configuration. Operation for the
default configuration is described first, and is then followed by front panel programming instructions to alter the operation.
Operating Instructions
Momentary/Latching Button action
The channel selector buttons and the MIC ON button feature a special momentary/latching dual-action: if a button is pressed
and released quickly it latches (turning on if off or turning off if on); if the button is pressed and held slightly longer, the action
is momentary and the button turns off when released. All other buttons are latching-only (press to activate, press to release).
NOTE:
The latching action can be disabled through the front panel programming.
LED Indicators
LED indicators are provided for each button to indicate current status. The LED can provide up to four (4) indications:
continuously off
continuously on
short blink (50% on, 50% off)
long blink (90% on, 10% off).
Channel Selection
Table 12 on page 37 summarizes the operation of the channel selector buttons for the various intercom line configurations.
Basically, 4-wire intercom lines always use one (1) TALK and one (1) LISTEN button for intercom communication, as do
2-wire lines when the station has been programmed for 2-channel operation.
When the station is operated in 4-channel mode, however, each 2-wire intercom line uses only one (1) channel selector button
to control both talk and listen, and the MCE-325 is pre-programmed so a channel is activated for both talk and listen when the
button is pressed. The button action can be changed from the front panel programming, so it controls talk only, with listen
either always on or always off.
