3 ELECTRICAL CONNECTIONS
Manual ERZ2000-DI · EN1.2 · 2017, December 21st
80
3.1.4
Pin assignment and usage recommendation of the inter-
faces
COM 1: Pin assignment
Pin
Mode: RS 232
Mode: RS 422
Mode: RS 485
1
+U (+5V DC)
+U (+5V DC)
+U (+5V DC)
2
RxD
TxD-A
3
TxD
R/TA A Data
4
RxD-A
5
GND
GND
SGND Signal Ground
6
TxD-B
7
8
RxD-B
R/TN B Data
9
Use
Switchable from
RS 232
to
RS 422
or
RS 485
, can be optionally assigned with
dif-
ferent protocols
,
MODBUS protocol
and
IGM
(for ultrasonic meters) available.
Optionally,
MODBUS ASCII / RTU
can be offered as
Modbus standard
driver for
RS 232 or RS 485 interfaces.
The operating mode for the COM 1 interface is adjusted in the wizard in the menu
IG Serial interfaces
with the coordinate
IG03 COM 1 operating mode
.
COM 2: Pin assignment
Pin
Mode RS 232
1
2
RxD
3
TxD
4
5
GND
6
7
8
9
The operating mode for the COM 2 interface is adjusted in the wizard.