Westermo ODW-631, Руководство пользователя, Страница: 19 / 24

19 6650-2241
RS-485 termination at system level
The system should be installed in according to the RS-485 specification. A system should
always form a bus structure where the termination is at the end points of the bus.
See diagrams for details of how this is done with RS-485 2-wire and 4-wire.
=Termination
ODW-631
Slave unit Slave unit Slave unit
ODW-631
Slave unit Slave unit Slave unit
Max 0.3 metre
=Termination
T/R+
T/R–
T/R+ T/R– T/R+ T/R– T/R+ T/R–
R+
R–
T+
T–
R– R+ R+ T– T– R– R+ T– T+ T+ T+ R–