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Simplex
A Simplex configuration is one in which more than two devices
are linked for communication using several IC-485SN units in a
manner similar to Multidrop. The difference is that in a Simplex
configuration, the Primary device can only talk, and the
Secondary devices can only listen.
Simplex uses reverse two wire cabling to link all the
connected IC-485SN units, as shown in the figure below:
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 of the units (Primary and Secondary), set SW2 to
TxON, RxON.
Primary
T+
T
-
R
-
R+
Secondary 1
R+
R -
T -
T+
Secondary 2
R+
R -
T -
T+
Secondary 3
R+
R -
T -
T+
:
:
Secondary 31
PC1
COM1/
COM2
PC2
COM1/
COM2
PC3
COM1/
COM2
PC4
COM1/
COM2
Содержание IC485SN
Страница 1: ......
Страница 17: ... 17 TxDTR RTS RxDSR ON 1 2 DATA DATA RTS CTS DTR TX RX DCE DTE DCE DTE 3 4 BUSY BUST DSR ...