Samsung C6435(P) - Manual (Page 13)

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ENG
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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.
Termination: using numbers 1 and 2 PIN, turn to ON and it will be terminated.
Controller
Division n <
Termination
SW1-ON
CAM n CAM n-1 CAM CAM 1
TX+(DATA+)
TX-(DATA-)
RX- RX+ RX+ RX- RX+ RX- RX+ RX-