4�10�- COMMUNICATIONS
The
CVM-C10
devices have one RS-485 communications port.
The device has as standard two communications protocols:
MODBUS RTU
® and
BACnet
.
The protocol and configuration parameters are selected in the setup menu. (
Note:
BACnet protocol available in devices 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 device of
1200 metres
.
A maximum of 32
CVM-C10
devices can be connected to this bus.
Use an intelligent RS-232 to RS-485 network protocol converter to establish the communications with
the master device.
B ( - )
A ( + )
S
POWER SUPPLY
INPUTS
A
(+)
B
(-)
GND
RS485
S1
S2
S1
S2 S1
S2
L1
P1
P2
L2
L3
300V ~
Ph-N
Ph-Ph
520V ~
N
V
L3
L2
V
L1
V
P1
P2 P1
P2
I1 I2
OUTPUTS
Rc R2 R1
Tc T2 T1
S0- S0+ S0+
POWER SUPPLY
INPUTS
A
(+)
B
(-)
GND
RS485
S1
S2
S1
S2 S1
S2
L1
P1
P2
L2
L3
300V ~
Ph-N
Ph-Ph
520V ~
N
V
L3
L2
V
L1
V
P1
P2 P1
P2
I1 I2
OUTPUTS
Rc R2 R1
Tc T2 T1
S0- S0+ S0+
RS-232 / USB / Ethernet / Profibus ...
PC
RS-485
RS-485
RS-232
USB
Ethernet
Profibus
...
Figure 34: RS-485 Connection diagram�
72
CVM-C10
Instruction Manual
