CDX800 DESCRIPTION
Connection of PORT2 connectors (RS422)
Panel socket RJ45.
Pin
No.
Signal
mark
Description
Data flow
direction
1
GND
Signal and supply ground
2
GND
Signal and supply ground
3
RxD-
Receive Data (-)
Output
4
RxD+
Receive Data (+)
Output
5
TxD-
Transmit Data (-)
Input
6
TxD+
Transmit Data (+)
Input
7
+12V EXT External power supply
8
+12V EXT External power supply
ATTENTION! External supply is for converter RS422!
The converter must have external power supply because of galvanic separated.
Circuit example of the meter with modem CDX 800 with data length less then 10 m:
15
Pin 1 – SGDN
Pin 2 – SGND
Pin 3 – RxD (-)
Pin 4 – RxD (+)
Pin 5 – TxD (-)
Pin 6 – TxD (+)
Pin 7 – +12V EXT
Pin 8 – +12V EXT
Modem CDX 800
SGND
TxD (-)
TxD (+)
RxD (-)
RxD (+)
Meter
DC
+
