Terminating Resistor

To reduce reflections of communication signal, terminating resistors should be attached on both ends of each segment. Attach the terminating resistor as shown below.

Symbol	Description
a	Data line A
b	Data line B

Some commercially available PROFIBUS 9-pin D-Sub connectors have functions of terminating resistor and they can enable/disable the terminating resistors.

Molded terminating resistors with connector that can be attached to environment-resistant M12 connector are also available.