janitza ProData 2, Инструкция по эксплуатации и технические данные

Страница: 16 / 56

16
ProData II
RS485 interface
In the ProData 2, the RS485 interface is designed as a 2-
pin plug contact, which communicates via the Modbus
RTU protocol (also see Parameter programming).
A
B
Correct
Incorrect
Termination resistors
The cable is terminated with resistors (120 Ohm, 1/4 W)
at the beginning and at the end of a segment.
Termination within the device is possible via the S1 DIP
switch of the ProData 2.
Terminal strip in the cabinet.
Device with RS485 interface
(without terminating resistor).
Device with RS485 interface
(with terminating resistor on the device).
Fig.: Placement in the middle of the segment;
termination via DIP switch S1 deactivated (OFF)
A
B
Fig.: Placement at the end of the segment;
termination via DIP switch S1 activated (ON)
S1
S1