Gicam WIN6, Руководство пользователя

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In the case of connection to two RS422 pairs and two nodes,
the resistors are placed near the farthest receiver and the
value can go down to 120 Ohm (figure on the side).
n the case of connection to two
RS422 but multi-node pairs,
the same 120 Ohm value is
indicated in the figure opposite,
but this applies to very long
lines (hundreds of meters). In
the case of shorter lines the
resistances must be increased
because the total impedance with the 120 Ohms would be a little too low, 60 Ohm without counting the load
of the receivers, so it would be better to use resistors of about ~ 250 Ohm.
The same goes for the
RS485 connection. Use 250
Ohm resistance for non-
excessively long lines.
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