Service manual

CDA70 MODEM DESCRIPTION
11
2.5.2. Connection of PORT1 connectors (MBUS)
Panel socket RJ45
Pin
number
Signal
mark
Description Data flow direction
1 SGND Signal and supply ground
2 SGND Signal and supply ground
3 TxRx- MBUS B (-) Input/Output
4 TxRx+ MBUS A (+) Input/Output
5 TxRx- MBUS B (-) Input/Output
6 TxRx+ MBUS A (+) Input/Output
7 +12V EXT External power supply +10,8 ÷ +15,6V
8 +12V EXT External power supply +10,8 ÷ +15,6V
ATTENTION! External supply is for converter MBUS!
The converter must have external power supply because of galvanic separated.
Circuit example of the meter with modem CDA70:
Pin 1 – SGND
2.5.3.
Connection of PORT2 connectors (RS485G)
Panel socket RJ45
Pin
number
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 supply +10,8 ÷ +15,6V
8 +12V EXT External power supply +10,8 ÷ +15,6V
ATTENTION! External supply is for converter RS485G!
The converter must have external power supply because of galvanic separated.
Pin 2 – SGND
Pin 3 – MBUS (-)
Pin 4 – MBUS (+)
Pin 5 – MBUS (-)
Pin 6 – MBUS (+)
Pin 7 – +12V EXT
Pin 8 – +12V EXT
Modem CDA70
Meter
DC
+