Setting Rs-422A/Rs-485 Termination - Samsung SCC-C6433 Manual Del Usuario

SETTING RS-A/RS-8 TERMINATION
As it is shown in the structure map, when Controller and RS-422A/RS-485 is connected,
it should be terminated according to the Cable feature of impedance on the each end of the
transmitting line to transfer the signals in long distance by controlling the reflection of the signals
to the lowest.
Division
TX+(DATA+)
Controller
TX-(DATA-)
Termination: using numbers 1 and 2 PIN, turn to ON and it will be terminated.
RX+ RX- RX+ RX- RX+
CAM 1 CAM 
<RS-8 Half Duplex Organization>
n < 
Termination
SW1-ON
RX- RX- RX+
CAM n-1 CAM n
1