CGU 04i DESCRIPTION
16
2.7.4 Connector PORT2 - RS422
Pin
Number
Signal
mark
Description
Data direction
1
GND
Signal and supply ground
2
GND
Signal and supply ground
3
RxD-
Receive Data (-)
Input/Output
4
RxD+
Receive Data (+)
Input/Output
5
TxD-
Transmit Data (-)
Input/Output
6
TxD+
Transmit Data (+)
Input/Output
7
+12V EXT External supply
8
+12V EXT External supply
ATTENTION!
Power supply is selected on the expansion port RS422 by help of a
jumper, ref. 2.9. If galvanic separation is required the converter must have an external
power supply.
Circuit example of the equipment with modem with data length less than 10 m:
DC
Meter
SGND
TxD(-)
TxD(+)
RxD(-)
RxD(+)
Modem CGU 04i
Pin 1 – SGND
Pin 2 – SGND
Pin 3 – RxD (-)
Pin 4 – RxD (+)
Pin 5 – TxD (-)
Pin 6 – TxD (+)
Pin 7 – +12V EXT
Pin 8 – +12V EXT
+
