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Fibre optic connection
RX1
LD-64D
TX1
RS-485
9
8
7
6
5
4
3
2
1
RS-485
Alarm connections (Opto Link Monitor)
Upon failure the circuit between the contacts C and E is closed.
Please note that the maximum allowed voltage/current is 30 V / 80 mA.
The alarm connection can for example be used
to control an external relay.
+
Max 30 V, 80 mA
–
In this example only channel 2 is connected. Under normal operation channel 1 and channel 2
should be connected.
6073-2041
Note! Always connect channel 1 to channel 2
RX2
TX2
Transmitter (Tx1)
Receiver (Rx1)
Transmitter (Tx2)
Receiver (Rx2)
RX1
RX2
LD-64D
TX1
TX2
RS-485
Relay
RX1
RX2
LD-64D
TX1
TX2
RS-485
9
8
7
6
5
4
3
2
1
21
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