
3.1 Overview of connections
Connection number on
master
Designation
Colour/connector No.
Description
Power supply
134
N
Blue
Neutral
135
L
Brown
Live
136
PE
Yellow/green
Protective earth
USB 2.0
Max. recommended cable length: 5 m
130
VCC
Red/1
5 V power supply
131
D-
White/2
Data -
132
D+
Green/3
Data +
133
GND
Black/4
Ground
RS-232
Max. recommended cable length: 15 m
105
RxD
2
Received Data
106
TxD
3
Transmitted Data
107
GND
5
Ground
108
DTR
4
Data Terminal Ready
109
CTS
8
Clear To Send
111
DSR
6
Data Set Ready
112
RTS
7
Request To Send
RS-485
Max. recommended cable length: 1,200 m
137
A/-
Transmit/Receive inverted
138
A+
Transmit/Receive non-inverted
139
GND
Ground
M-Bus Repeater Input
Jumper must be set to Repeater
53
L1
M-Bus input to master in repeater mode
54
L2
M-Bus input to master in repeater mode
M-Bus Master Output
4 sets connection terminals, connection in parallel
24
L1
M-Bus output from master to meters
25
L2
M-Bus output from master to meters
55121391_B1_GB_12.2013
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