MCE-325 Programmable User Station
Installation 21
Bosch Security Systems, Inc.
Technical Manual
F.01U.193.228
Rev. 13
Intercom Line Channel Configurations (DS1-DS3, J6, J7, J19, and J20)
The four (4) channels of the MCE-325 may be assigned to intercom lines in a variety of ways. Channel assignment is
determined by the settings of DIP switches DS1 through DS3 and jumpers J6, J7, J19, and J20. There are six (6) possible
intercom line configurations. These are listed in the Table 1 together with the proper DIP switch and jumper settings for each.
TABLE 1.
DIP Switch Functions and Default Settings
Switch
Number
Switch Function
Default Setting
DS1
4-wire CH A output not installed (Off)
4-wire CH A output installed (On)
Off
DS2
4-wire CH B output not installed (Off)
4-wire CH B output installed (On)
Off
DS3
2-channel mode (Off)
a
4-channel mode (On)
a. The terms 2-channel and 4-channel mode apply only to 2-wire lines. In 2-channel mode, each 2-wire line uses two (2) channel
selector buttons: one (1) for talk and one (1) for listen. In 4-channel mode, each 2-wire line uses one (1) channel selector button for
both 2-channel mode should be selected under only two (2) circumstances:
• When only 1- or 2-wire lines are connected to channels 1 and 2 only.
• When a 2-wire line is connected to channel 1 and a 4-wire line is connected to CH B.
For all other intercom line configurations using 2-wire lines, DS3 must be set to the on position for 4-channel operation.
Off
DS4
Front panel setup lock-out disabled (Off)
Front panel setup lock-out enabled (On)
Off
DS5
Listen and talk muted during ISO (Off)
Talk only muted during ISO (On)
Off
DS6
Not Used
Off
DS7
Talk-off transmit disable (Off)
Talk-off Transmit enabled (On)
On
DS8
VOX disabled (Off)
VOX enabled (On)
Off
