Circutor CVM-C11, Instruction Manual

Page: 74 / 106

7.- 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 ”
)
7�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-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 D0
C
D01 D02 DI
C
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 P2 P1 P2 P1
POWER SUPPLY OUTPUTS INPUTS RS-485
A1(+) A2(-) R0
C
R01 R02 D0
C
D01 D02 DI
C
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 P2 P1 P2 P1
Figure 23: RS-485 Connection diagram�
74
CVM-C11
Instruction Manual