43
Instruction Manual
CVM-D41 DC
6.- RS-485 COMMUNICATIONS
The
CVM-D41 DC
devices have one
RS-485
communications port, with communications protocols:
MODBUS RTU ®
.
6�1�- CONNECTIONS
The
RS-485
cable must be wired with twisted pair cable with mesh shield, with a maximum distance
between the
CVM-D41 DC
and the master device of 1200 metres.
A maximum of 32
CVM-D41 DC
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
...
B
A
B
A
58 59
RS-485
58 59
RS-485
Figure 25: RS-485 Connection diagram�
Note:
Default values of the RS-485 communication:
19200 bps
,
No parity
,
8 data bits
and
1 stop bit.
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