Westermo MD-21 - Manual (Page 3)

9 6151-2002
Settings MD-21
The MD-21 can through different switch settings be adapted to a variety of running
conditions. To set the switches, open the lid on the top of the plastic case.
WARNING! DO NOT OPEN CONNECTED UNIT
1 2 3 4 5
MD-21DC
V24/RS-232-C
CURRENT LOOP
CONVERTER
LINE CONNECTION
- +
103 104
12-36V DC
POWER
R+ R- T+ T-
V24/RS-232-C
CONNECTION
TD RD PWR RTS CTS DCD DSR DTR SG
105 106 109 108 107 102
1
2
3
456
789
S4:1-6 S1:1-6 S3:1-6
Inverted Transmitter/Receiver
Receiver active/passive
Factory settings
Trans-
mitter
Normal Normal
Normal
Inverted
Inverted
Inverted
Normal
Inverted
Receiver
S1
S1
S1
S1
Passive S3
Active S3
S3
Transmitter active/passive
Passive S4
Active S4
S4
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
CTS-control
Always high S1
S1
RTS S1
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
S1: 5-6 not used