CGU 04i DESCRIPTION
15
Circuit example of the equipment with a modem with data length less than 10 m:
Circuit example of the equipment with a modem with data length more than 10 m:
At RS485 data cable more than 10m it is need to use overvoltage protection on the
modem side!
Pin 1 – SGDN
Pin 2 – SGND
Pin 3 – RS485 (-)
Pin 4 – RS485 (+)
Pin 5 – RS485 (-)
Pin 6 – RS485 (+)
Pin 7 – +12V EXT
Pin 8 – +12V EXT
Modem CGU 4i
SGND
RS485 (-)
RS485 (+)
Meter
SGND
RS485 (-)
RS485 (+)
Meter
DC
+
Pin 1 – SGND
Pin 2 – SGND
Pin 3 – RS485 (-)
Pin 4 – RS485 (+)
Pin 5 – RS485 (-)
Pin 6 – RS485 (+)
Pin 7 – +12V EXT
Pin 8 – +12V EXT
Modem
CGU 04i
SGND
RS485 (-)
RS485 (+)
Meter
SGND
RS485 (-)
RS485 (+)
Meter
1X
2X
1Y
2Y
OVPM-
21
DC
+
