CONEL CDA 70 [12/43] Cda70 modem description

CDA70 MODEM DESCRIPTION

Circuit example of the meter with modem CDA70 with data cable length more than 10 m:

M-BUS data cable more than 10 m it is need to use over-voltage protection on CDA 70

modem side!

External or internal power supply of expansion port M-BUS it is can evoke by wiring

of the jumper. For details see chapter 2.8.

2.5.3. Connection of PORT2 connectors (RS485G)

Panel socket RJ45

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.

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

OVPM-21