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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 30V, 80 mA
–
In this example only channel 2 is connected. Under normal operation channel 1 and channel 2
should be connected.
RS-232/V.24
DTE-equipment
SG TD RD
PWR
TD RD
OPTO LINK MONITOR
LD-64
Rx1
*) The designations T+, T–, R+, R– are not standardised and may vary between different
manufactures. The first step in fault finding is to reverse the cables (swap T+ with T–
and/or R+ with R–). Please note that this should be done only at one end!
6073-2002
C
E
C
E
Ch1
Ch2
Rx2
Relay
Rx2
Tx1
Tx2
RS-422/485
POWER
R+
R- T+
T-
1 2
3
4
5
N
L
*
T
T
R
R
+
–
+
–
RS-422
equipment
PWR
TD RD
C
E
C
E
Ch1
Ch2
OPTO LINK MONITOR
LD-64
Rx1
Rx2
Rx2
Tx1
Tx2
RS-422/485
POWER
R+
R- T+
T-
1 2
3
4
5
N
L
*
T
T
+
–
RS-485
equipment
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