SW1-3
T-DDisable RS-485/422 receiver terminator
T-EEnable RS-485/422 receiver terminator
[T-E] setting enables the internal 120 ohms terminator on the receiver interface. A proper termination is important in a bus topology or multi- drop network. The terminator is a resistor added in parallel with the receiver's "A" and "B" lines in order to match the data line characteristic impedance and reduce signal reflection. This setting is useful when the converter is installed at the end of a RS-485 or RS-422 bus.
If the internal 120 Ohm terminator is not appropriate for your application, use [T-D] to disable it and use external one.
