Other Fixed Units - ASCOM T942C System Installation

System Installation
Ascom Paging System
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Other Fixed Units

• The Central Unit contains all four data buses. All communication on the data buses is
controlled by the control unit. All fixed units with the exception of terminal
transmitters are connected to the Central Unit via the A-bus. If there are more than 32
units in the system, a bus converter or the B-bus can be used. A system can contain a
maximum of 60 addressable units regardless of which bus the units are connected to.
• The Unite Connectivity Manager (Unite CM) supports alarm handling and is connected
to the Ascom Paging System via the A-bus. An Alarm Management Client (AMC) can
be used to view alarms graphically on the Unite CM. The AMC communicates with the
Unite CM via LAN.
• The Output Module contains 16 outputs for connection of indicator lamps or relays
plus an input for connecting a switch, for example a push-button. The outputs and
inputs are galvanically isolated and transient protected. There is also a relay output for
system fault indication. The power supply to the 16 outputs can be either internal or
external, for galvanic isolation the supply must be external.

The outputs are arranged in four groups of four outputs each, and the groups are
galvanically isolated from each other and separately supplied with power. If internal
power is used, the system supply voltage and system ground is jumpered to each
respective group. Switches that are connected to the input for alarm initiation,
acknowledgement or reset, are connected directly to the screw terminal and can be
fed with internal or external power. The system fault indication is fed with internal
power and can be jumpered for either make or break function.
• The Alarm Module contains 8 or 32 inputs for connecting fixed alarm points plus an
input for external acknowledgement. The inputs are galvanically isolated and transient
protected. There is also a relay output for system fault indication. The power supply to
the inputs can be either internal or external, for galvanic isolation the supply must be
external.
10 October 2013 / Ver. D
TD 90227GB
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