30 Installation MCE-325 Programmable User Station
Bosch Security Systems, Inc.
Technical Manual
F.01U.193.228
Rev. 13
ISO Connection
To connect an RTS Model VCP6A, VCP12A, or VCP12B ISO Control Panel to the MCE-325, do the following:
1. Connect the unswitched microphone output of the MCE-325 (pins 1 and 14 of the auxiliary connector) to the 4-
wire input of the VCP Control Panel.
2. Connect the 4-wire output of the VCP Control Panel to either a 4-wire input or a program input of the MCE-
325.
3. Connect the logic contact output of the VCP Control Station to the ISO input of the MCE-325 (pin 12 of the
auxiliary connector).
4. Connect VCP common to pin 11 of the auxiliary connector.
External Headset
An external headset may be connected to the auxiliary connector (See “Headset Requirements” on page 31).
To connect an external headset, do the following:
1. Connect headphone left to pin 5.
2. Connect headphone right to pin 18.
3. Connect headphone common to pin 17.
4. Connect microphone high to pin 4.
5. Connect microphone low to pin 16.
NOTE: The external headset connections are wired in parallel with the front panel dynamic headset connector;
therefore, use only one (1) at a time.
In the headset connecting cable, prevent coupling between the microphone and headphone leads by using a shielded twisted
pair for the microphone, and a separate shielded twisted pair for the headphones. Do not allow headphone common to contact
microphone low. Tie the headphone shield to headphone common. The headset cable can be made longer when the
microphone and headphone pairs are physically separated. The wider the separation, the longer the allowable cable length.
Estimated maximum usable headphone cable lengths are as follows:
• Single cable, two shielded twisted pairs: 10ft (3.05m)
• Dual-ribbed cable, two shielded twisted pairs: 30ft (9.14m)
• Separate Shielded twisted pair cables: 50ft (15.24m)
• Balanced microphone input: up to 100ft (30.48m)
External Electret Microphone
An external electret microphone may be connected at the auxiliary connector and used in place of a front panel gooseneck
microphone.
To connect an external Electret microphone, do the following:
1. Connect microphone high/bias to pin 15.
2. Connect microphone low to pin 2.
NOTE: When using an external microphone, do not connect a front panel gooseneck microphone.
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