Westermo LD-64 - Manual (Page 20)

20 6073-2002
Fibre optic connection
LD-64
RX1 RX2
TX2 TX1
RX1 RX2
TX2 TX1
LD-64 LD-64
RX1 RX2
TX2 TX1
RS-422/485 RS-232 or RS-422/485 RS-232 or RS-422/485 RS-232 or
Note! Always connect channel 1 to channel 2
1 2 3 4 5 6 7 8 9
Alarm indication
Alarm connectors are polarity depended.
Alarm signals
Upon failure the circuit between the contacts “C” and
“E” is closed. This circuit can be used to generate an
external alarm signal by connecting an external relay as
shown on page 21. Please note that the maximum
allowed voltage/current is 30 V/80 mA.
Alarm connection
(9-position screw terminal)
Connection Description Polarity
1 CH2, E –
2 CH2, C +
3 CH1, E –
4 CH1, C +
Note !
C
E