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4.10.- COMMUNICATIONS

The CVM-C10 units have one RS-485 communications port.

The unit has as standard two communications protocols: MODBUS RTU ® and BACnet.

The protocol and conguration parameters are selected in the setup menu. (“4.9.28. RS-485

communications: Protocol”)

Note: BACnet protocol available in units with version 3.00 or higher.

4�10�1� CONNECTIONS

The RS -485 cable must be wired with twisted pair cable with mesh shield (minimum 3 wires),

with a maximum distance between the CVM-C10 and the master unit of 1200 metres.

A maximum of 32 CVM-C10 units can be connected to this bus.

Use an intelligent RS-232 to RS-485 network protocol converter to establish the

communications with the master unit.

B ( - )

A ( + )

POWER SUPPLY

INPUTS

A(+) B(-)

GND

RS485

S1 S2

P1 P2

300V

Ph-NPh-Ph

520V

L3L2

P1 P2

I1 I2

OUTPUTS

Rc R2 R1 Tc T2 T1

S0-

S0+ S0+

POWER SUPPLY

INPUTS

A(+) B(-)

GND

RS485

S1 S2

P1 P2

300V

Ph-NPh-Ph

520V

L3L2

P1 P2

I1 I2

OUTPUTS

Rc R2 R1 Tc T2 T1

S0-

S0+ S0+

RS-232 / USB / Ethernet / Profibus ...

RS-485

RS-232

USB

Ethernet

Profibus

...

Figure 25: RS-485 Connection diagram�

Instruction Manual

CVM-C10

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 81 82

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