Circutor AFQm Series, Instruction Manual

Page: 72 / 108

72
AFQm
Instruction Manual
8�- RS-485 COMMUNICATIONS
AFQm
devices have an RS-485 serial communication output with the
MODBUS RTU
® com-
munications protocol.
For an installation with devices in parallel, the RS-485 connection can be made on any device.
8.1.- CONNECTIONS
The RS-485 cable must be wired with twisted pair cable with mesh shield (minimum 3 wires),
with a maximum distance between the AFQm and the master device of 1200 metres.
A maximum of 32
AFQm
filters can be connected to this bus.
To establish communications with the master device, use an RS-485 intelligent converter.
B(-) A(+)
S
RS-232 / USB / Ethernet / Profibus ...
PC
RS-485
RS-485
RS-232
USB
Ethernet
Profibus
...
S
A B
Figure 76: RS-485 Connection diagram�
The RS-485 communications configuration in AFQm models is set to a baud rate of 9600 bps,
8 data bits, 1 stop bit and no parity.