CONEL CDA 70 [11/43] Cda70 modem description

CONEL CDA 70 [11/43] Cda70 modem description
CDA70 MODEM DESCRIPTION
11
Circuit example of the RS232 equipment with modem CDA70:
2.5.2.
Connection of PORT1 connectors (M-BUS)
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- M-BUS B (-) Input/Output
4 TxRx+ M-BUS A (+) Input/Output
5 TxRx- M-BUS B (-) Input/Output
6 TxRx+ M-BUS 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 M-BUS!
The converter must have external power supply because of galvanic separated.
Circuit example of the meter with modem CDA70 with data cable length less than 10 m:
DC
Meter
SGND
MBUS (-)
MBUS (+)
Meter
SGND
MBUS (-)
MBUS (+)
Modem CDA70
Pin 1 – SGND
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
Cable KD-2
PWR
CIO
PORT3
PORT2
PORT1 ETH

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