Tait TB7100, Инструкция по установке и эксплуатации

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TB7100 Installation and Operation Manual Functional Description 39
© Tait Electronics Limited December 2005
The SI board provides an unbalanced audio input and output for connecting
to other devices.
3.4.7 Opto Isolated Keying
External keying of the base station can be achieved using the current
regulated optically isolated keying connections.
3.4.8 Relay Output
The SI board can provide a relay output with a load voltage of 350V or load
current of 120 mA continuous. The SI board can also provide a relay driver
output. Both these options are configurable and these settings are discussed
in
“Preparation for Operation” on page 77 .
3.4.9 Fan Control
There are three modes of operation for the fans. The modes are:
■
on continuous
■
on when transmitting
■
on at a pre-defined temperature.
The modes of operation are selected by links on the SI board. These settings
are discussed in
“Preparation for Operation” on page 77 .
3.4.10 RSSI
A received signal strength indication (RSSI) voltage is developed by the
receiver module and applied directly to the SI board rear panel.
3.4.11 Receiver Gate
The receiver gate signal is used by the SI board to control TOI and a relay
output. The receiver gate output on the
SYSTEM
connector can be used for
external equipment such as TaitNet trunking controllers.
3.4.12 Receiver Inhibit
The receiver inhibit input on the
SYSTEM
connector is used to control the
receiver gate signal. This may be used in linking applications to prevent
unwanted receiver audio signals from appearing at the SI board output
connector.