Westermo LD-64 - Manual (Page 21)

The alarm connection can for example be used
to control an external relay.
21 6073-2002
LD-64
Rx1
Rx2
TD RD C E PWR
OPTO LINK MONITOR
Ch1
C E
Ch2
SG TD RD
RS-232/V.24
DTE-equipment
*) 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!
LD-64
Rx1
Rx2
TD RD C E PWR
OPTO LINK MONITOR
Ch1
C E
Ch2
Max 30V, 80 mA
Relay
In this example only channel 2 is connected. Under normal operation channel 1 and channel 2
should be connected.
+
–
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.
1 2 3 4 5 L N
RS-422/485 POWER
R+
Rx2
Tx1
Tx2
R- T+ T-
1 2 3 4 5 L N
RS-422/485 POWER
R+
Rx2
Tx1
Tx2
R- T+ T-
R +
RS-422
equipment
R – T + T –
RS-485
equipment
T + T –
* *