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16
3.4.1.3 RS485 Communications
One RS485 bus circuit is provided for connection
of the Remote Status Indicator panels to the
Extinguishing Control Panel.
SUPERVISED. POWER LIMITED.
Wiring to be twisted pair. The use of screened
cable is recommended in noisy environments.
Maximum distance 1000m. Maximum line
imp
edance 50Ω.
Connect the cable from 'A' to 'A' and from 'B' to 'B'.
Equipment is connected via a daisy chain. A 150Ω
End-of-Line resistor to be fitted at last unit.
Connect the screen to one of the earth studs in
the back of the panel enclosure and to the
designated point in the remote status indicator
panels. Ensure the screen is continuous.
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A B
B A
SCR
B A
SCR
B A
SCR
B A
SCR
150Ω
IN
OUT
IN
OUT
Remote
Status
Indicator
Remote
Status
Indicator
Extinguishing
Panel
RS485
AUX Supply
3.4.1.4 Input Circuits
Two Programmable Function Input Circuits are
provided.
Each input circuit is monitored for open and short
circuit conditions
– see typical arrangement below.
EOL = 6800Ω. Maximum line impedance 50Ω.
Connect to volt-free switches / relay contacts only.
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6K8
470R
TYPICAL SWITCH
ARRANGEMENT
6K8
6K8
470R
VALVE MONITOR SWITCH
ARRANGEMENT
VALVE FULLY OPEN
VALVE FULLY CLOSED
The VALVE MONITOR input is used to monitor the open / closed state of a mechanical valve control
device.
If the valve is in an indeterminate state (neither fully open nor fully closed) for more than 30 seconds, the
panel will indicate a fault condition.
The function / action of the inputs is defined in the control panel. Refer to the control panel manual for
further details. If unused, connect a 3300Ω (or 2x 6800Ω in parallel) EOL across the terminals.
3.4.1.5 USB
The USB socket is for connection to a Laptop or PC.
This can be used for upload of a new logo.
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