
3. Installation
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Fitting a Plug-on Communicator (9851 only)
The 9851 control unit can be fitted with a plug-on communicator. To fit it,
follow the instructions below.
Caution: Before fitting a plug-on communicator, you must power down
the control unit completely, both mains and battery supplies.
When reapplying power, connect the battery first. Failure to do
so may damage the control unit.
Remember to short the Kick Start pins when powering from a battery only.
Plug-on Communicator Signals:
The plug-on communicator uses a variant of the standard Scantronic footprint:
° The functions of the plug-on pins are fixed and cannot be modified.
° All outputs are positive-applied (5V) in alarm.
° All inputs are positive-applied (12V or 5V) to indicate line failure,
communications failure and tell back.
Pin Channel Sent to
ARC
Input /
Output
Signal
1 CH 1 Output Fire
2 CH 2 Output PA
3 CH 3 Output Burg
4 CH 4 Output Close = +ve, Open = -ve
5 CH 5 Output Omit
6 Input Tel Back
7 Input Comms Fail
8 Output Low Batt
9 Power supply 12V
10 Power supply 0V
11 – Not Used
12 Power supply 5V
13 CH 6 (see Note) Output Abort
14 CH 7 (see Note) Output Confirm
15 Input Line Fail
16 CH 8 Output Technical
Note: Some RedCare STUs reverse Channels 6 and 7 so that Confirm is on
pin 13 and Abort is on pin 14. For information on the operation of
RedCare communicators, see the manufacturer's instructions.
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