
496791 1
1. Introduction
1. INTRODUCTION
The 9851 is designed to be fully programmable to suit individual site require-
ments and user needs.
The system comprises a control unit in a shielded case, up to four separate
keypads and one keyswitch interface (see Figure 1 on the next page). You
should always fit at least one keypad.
The control unit provides:
° A four-wire bus connection for keypads, keyswitches and hard-wired or
wireless zone expanders.
° Connections for either Closed Circuit, Fully Supervised Loops, or End
of Line resistor zones.
° Connections for four fully programmable outputs.
° Internal sounder loudspeaker output with electronically generated
Chime, Alarm, Fire and Entry/Exit tones. (The volume of the Entry/Exit
and Chime tones can be adjusted).
° Built in communicator for reporting to an Alarm Receiving Centre
(ARC).
° Pins for fitting any plug-on communication device that complies with
the Scantronic plug-on footprint.
° Pins for fitting a plug-by communication device.
° Local or remote downloading.
The control unit provides connectors for eight Closed Circuit (CC) zones or
16 Fully Supervised Loop (FSL) zones on its own printed circuit board.
Separate expander units allow connection of further zones up to a total of 40.
The 9954 expander provides eight wired zones. Alternatively, a 9955 ex-
pander allows connection of eight wire-free zones.
The control unit supports the 9930 sixteen character Liquid Crystal Display
(LCD) keypad. In addition the control unit also supports the 9928 keyswitch
interface.
As an Installer you can program the system either from the keypads, or using
PC based Windows <Downloader>. When programming from the keypads
the programming interface is arranged as a set of three-digit numbered
commands similar to those used by the 9800 family of products.
The system can provide for up to 16 separate users. User facilities include:
° Four different security levels which can be programmed by the Installer
as either full set and three part sets, or four independant partitions.
° User programmable Duress code.
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