7�- Cvm-E3-Mini-Xxx : Rs-485 Communications; 7�1�- Connections - Circutor CVM-E3-MINI Instruction Manual

7.- CVM-E3-MINI-xxx : RS-485 COMMUNICATIONS
The CVM-E3-MINI-xxx 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. (
CATIONS (Models CVM-E3-MINI-xxx)"
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-E3-MINI and the master device of
A maximum of 32 CVM-E3-MINI 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.
86
PC
RS-232 / USB / Ethernet / Profibus ...
RS-232
USB
Ethernet
Profibus
...
RS-485
RS-485
A(+)
B(-)
S
).
A
B
S
Figure 33: RS-485 Connection diagram�
"6.22.- RS-485 COMMUNI-
1200 metres.
A(+)
A
B(-)
B
S
S
Instruction Manual
CVM-E3-MINI
A(+)
B(-)
S