6�- INTEGRATED COMMUNICATIONS
The
CVM-A
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 on the setup menu. (
).
The device is factory configured with the
MODBUS
protocol.
6.1.- CONNECTIONS
The RS-485 cable should be wired with a twisted pair cable with mesh shield (minimum 3
wires), with a maximum distance between the
CVM-A
and the master device of 1200 metres.
A maximum of 32
CVM-A
devices can be connected to this bus.
Use an intelligent converter to establish communications with the master device.
B ( - )
RS-232 / USB / Ethernet / Profibus ...
PC
B ( - )
A ( + )
RS-485
S
A(+) B(-) S
A(+) B(-) S
RS-485
RS-232
USB
Ethernet
Profibus
...
Figure 325: RS-485 Connection diagram�
227
Instruction Manual
CVM-A1000 - CVM-A1500
Содержание CVM-A1000
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