CDX800 DESCRIPTION
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 over-voltage protection on CDX
800 modem side!
2.6.3.
Connection of PORT2 connectors (RS485)
Panel socket RJ45.
Pin
No.
Signal
mark
Description
Data flow
direction
1
GND
Signal and supply ground
2
GND
Signal and supply ground
3
TxRx-
RS485 B (-)
Input/Output
4
TxRx+
RS485 A (+)
Input/Output
5
TxRx-
RS485 B (-)
Input/Output
6
TxRx+
RS485 A (+)
Input/Output
7
+12V EXT External power 10,8 ÷ +15,6V
8
+12V EXT External power 10,8 ÷ +15,6V
ATTENTION! External supply is for converter RS485!
The converter must have external power supply because of galvanic separated.
13
Pin 1 – ---
Pin 2 – ---
Pin 3 – RS485 (-)
Pin 4 – ---
Pin 5 – ---
Pin 6 – RS485 (+)
Pin 7 – ---
Pin 8 – ---
Modem CDX 800
SGND
RS485 (-)
RS485 (+)
Meter
SGND
RS485 (-)
RS485 (+)
Meter
1X
2X
1Y
2Y
OVPM-21
