Circutor AFQm 30 A - RS-485 Communications; RS-485 Connections

79
Instruction Manual
AFQm
8.- RS-485 COMMUNICATIONS
AFQm devices have an RS-485 serial communication output with the MODBUS RTU ® communica-
tions 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 85: 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.