CDX800 DESCRIPTION
Circuit example of the meter with modem CDX 800 with data length less then 10 m:
Circuit example of the meter with modem CDX 800 with data length more then 10 m:
At RS485 data cable more then 10m it is need to use overvoltage protection on CDX
800 modem side!
14
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 CDX 800
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 CDX 800
SGND
RS485 (-)
RS485 (+)
Meter
SGND
RS485 (-)
RS485 (+)
Meter
1X
2X
1Y
2Y
OVPM-21
DC
+
