Circutor CVM-C11 - 8�- Rs-485 Communications; 8�1�- Connections

8. RS485 COMMUNICATIONS
The CVM-C11 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. (“6.31. RS485 COMMUNI
CATIONS: PROTOCOL”).
8.1.- CONNECTIONS
The RS -485 cable must be wired with twisted pair cable with mesh shield, with a maximum distance
between the CVM-C11 and the master device of 1200 metres. A maximum of 32 CVM-C11 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(+)
RS-232 / USB / Ethernet / Profibus ...
PC
RS-485
RS-485
RS-232
USB
Ethernet
Profibus
...
POWER SUPPLY OUTPUTS INPUTS RS-485
A1(+)
A2(-)
R0
C R01 R02 D0C D01 D02 DIC DI1 DI2
A(+) B(-)
U
L1
U
L2
U
L3
N
IL1
IL2
IL3
IN
S1
S2
S1 S1
S1
S2 S2 S2
P2
P1
P2
P1
P2P1 P2P1
POWER SUPPLY OUTPUTS INPUTS RS-485
A1(+)
A2(-)
R0
C R01 R02 D0C D01 D02 DIC DI1 DI2
A(+) B(-)
U
L1
U
L2
U
L3
N
IL1
IL2
IL3
IN
S1
S2
S1 S1
S1
S2 S2 S2
P2
P1
P2
P1
P2P1 P2P1
Figure 40: RS-485 Connection diagram.
99
Instruction Manual
CVM-C11