Settings md-21, Warning! do not open connected unit, Transmitter active/passive – Westermo MD-21 User Manual
Page 3: Cts-control
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