Bronkhorst FLOW-BUS interface - Manual (Page 16)

BRONKHORST ®
Bronkhorst offers special begin‐termination connectors with the resistor network. This handles correct termination
but also gives a defined voltage on the RS485‐A and ‐B line for even more reliability of the bus system.
An end‐terminator is also offered by Bronkhorst and handles correct termination ad the end of the bus.
Termination can be performed with special termination‐connectors, offered by Bronkhorst.
Termination schematic
RJ45 M12
703297‐‐RJ45 Begin
terminator
703298‐‐RJ45 End
terminator
Begin terminator End terminator
FLOW‐BUS system
Page 16 FLOW‐BUS interface 9.17.024
At the beginning of each FLOW‐BUS system there always must be a resistor network as showed above. This begin‐
terminator needs to be part of your system. Bronkhorst offers special begin‐termination connectors with the resistor
network. This handles correct termination but also gives a defined voltage on the RS485‐A and ‐B line for even more
reliability of the FLOW‐BUS system.
Bronkhorst advises always to use a termination resistor at the end of the bus in your system. This end‐terminator is
also offered by Bronkhorst and handles correct termination for the FLOW‐BUS.
+15…24Vdc
RB1
976 Ohm
RS485‐A
RT1
121 Ohm
RB2
392 Ohm
RS485‐B
RT2
121 Ohm
Begin termination (RED) End termination (BLACK)