36
UMG 509
RS485 interface
In the UMG 509, the RS485 interface is designed
as a 3-pin plug contact, which communicates via
the Modbus RTU protocol.
A B
RS485 Bus
Correct
Incorrect
Termination resistors
The cable is terminated with resistors (120Ohm, 1/4W)
at the beginning and at the end of a segment.
Termination within the device is possible via the S1 DIP
switch of the UMG 509.
Terminal strip in the cabinet.
Device with RS485 interface.
(without termination resistor)
Device with RS485 interface.
(with termination resistor on the device)