Siemens SICAM CMIC - Pin Assignment

Interfaces and Circuitry
50 SICAM RTUs, User Manual SICAM CMIC
DC8-001-2.09, Edition 08.2016
2.2 Pin Assignment
Communication interfaces on the top
X2: RS-232 X3: RS-485 2-wire X1: Ethernet
DCD (I)
RXD (I)
TXD (O)
DTR (5V/10V)
GND
DSR (I)
RTS (O)
CTS (I)
not used
shield
not used
not used
TXD
- / RXD-
TXD+ / RXD+
O V
TXD+
TXD
-
RXD+
not used
not used
RXD
-
not used
not used
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 1 2 3 4 5 6 7 8
↕ ↕ ↕
X3 RS-422 4-wire
shield
RXD
-
RXD+
TXD
-
TXD+
0 V
1 2 3 4 5 6
The abbreviations have the following meaning:
DCD (I)……………. Data Carrier Detect (Input)
RXD (I)……………. Receive Data (Input)
TXD (O)…………… Transmit Data (Output)
DTR……………….. Data Terminal Ready
GND………………. Ground
DSR (I)……………. Data Send Ready (Input)
RTS (O)…………… Request To Send (Output)
CTS (I)…………….. Clear to Send (Input)
TXD+, TXD-………. Transmit Data
RXD+, RXD-……… Receive Data
Note
In case of using the RS-485 interface (X3) it is necessary to clamp the shield of the communication cable
to the DIN rail. This shield clamping should be done close to the system.
Note
The assignment of X3 is independent whether a termination is existing or not
(termination = resistance that is connected through parameter in the firmware).
CMIC
R
S
-
4
8
5
R
S
-
4
8
5
Remote station
DIN rail