ATEN IC-485AI, Руководство пользователя

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1. Multidrop Full Duplex

Multidrop Full Duplex uses reverse four wire cabling, to
link all the connected IC-485AI units:

For all IC-485AI units, set the unit to DCE or DTE
depending on what type of device the IC-485AI will plug
into (if it will plug into a DCE device, configure it for DTE,
and vice versa).

For the Primary unit, set SW7 ON ; set SW8 ON (RS-422
Primary mode).

For all of the Secondary units, set SW7 ON ; set SW8 OFF
(RS-422 Secondary mode).
Note: 1. No more than 31 Secondary units can be connected.
2. When any of the Secondary units transmits data, none
of the other Secondary units may transmit. RTS for all
other Secondary units must be pulled low.
Primary
T+
T -
R -
R+
Secondary 1
R+
R -
T -
T+
Secondary 2
R+
R -
T -
T+
..
.
Secondary 31
PC1
COM1/
COM2 PC2
COM1/
COM2
PC3
COM1/
COM2