Fibre optic connection – Westermo LD-64F User Manual
Page 10
20
6073-2001
Fibre optic connection
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
–
*) 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-64F
RX1
RX2
TX2
TX1
RX1
RX2
TX2
TX1
LD-64F
LD-64F
RX1
RX2
TX2
TX1
RS-422/485
RS-422/485
RS-422/485
Line connection
The alarm connection can for example be used
to control an external relay.
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.
In this example only channel 2 is connected. Under normal operation channel 1 and channel 2
should be connected.
LD-64
Rx1
Rx2
TD RD
C
E
PWR
OPTO LINK MONITOR
Ch1
C
E
Ch2
Max 30 V, 80 mA
Relay
+
–