ATEN IC485SN, Руководство пользователя

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2. Multidrop Half Duplex

Multidrop Half Duplex uses straight-through four wire
cabling, to link all the connected IC-485SN units:

For all IC-485SN units, set SW1 to DCE or DTE depending
on what type of device the IC-485SN will plug into (if it will
plug into a DCE device, configure it for DTE, and vice
versa).

For all IC-485SN units set SW2 to TxDTR/RTS, RxDSR/
ON.
Note: 1. Only one device at a time can talk on the bus (RTS ON).
During that time, the other devices must remain silent
(RTS OFF). See the explanation regarding TxDTR/
RTS, RxDSR/ON in the Switch Configuration section.
2. TxDTR/RTS, RxDSR/ON transmitting/receiving mode,
involves a straight-through Data+ , Data- , Busy+ ,
Busy- wiring scheme. See the TxDTR/RTS, RxDSR/
ON schematic
DATA+
DATA -
BUSY+
BUSY -
DATA+
DATA -
BUSY+
BUSY -
DATA+
DATA -
BUSY+
BUSY -
DATA+
DATA -
BUSY+
BUSY -
Connect
to PC#1's
COM port
Connect
to PC#2's
COM port
Connect
to PC#3's
COM port
Connect
to PC#4's
DB-25
RJ-11
RJ-11
RJ-11
RJ-11
DB-25
DB-25 DB-25
5
4
2
3 5
4
2
3
5
4
2
3 5
4
2
3