Digital Electronics Corporation PL-3900T Series Instrukcja instalacji - Strona 8

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Switch
Description
No.
Switches the RD
6
(RXD) termination
resistance ON/OFF
Switches the
7
shorting of SDA and
RDA ON or OFF
Switches the
8
shorting of SDB and
RDB ON or OFF
RS (RTS) Automatic
9
control mode
(enabled only when
10
RS-485 mode)
*1 Be sure to keep the settings, "OFF".
*2 Set switches number 9 and 10 to ON when the SD (TXD) output driver is automatically controlled
with RS (RTS). Set switch number 4 to OFF.
Set switches number 9 and 10 to OFF when the SD (TXD) output driver is controlled with the RS
(RTS) signal. Set switch number 4 to ON.
*3 If you use the termination resistance, base your settings on the connection specifications.
Serial Mode Select Switches (SW4 to SW10) operate as shown in the circuit diagram below.
SD(TXD)
RT(RTS)
RT(RTS) Automatic
control
ON
Inserts
termination
resistance of
220Ω between
RDA and RDB.
Shorts SDA and
RDA
(RS-485 mode)
Shorts SDB and
RDB
(RS-485 mode)
The data is
automatically
controlled via the
RS (RTS) signal.
SW4
SW9
SW10
8
OFF
No termination
OFF
No shorting
OFF
(RS-422 mode)
No shorting
OFF
(RS-422 mode)
The data is not
OFF
automatically
controlled via the
OFF
RS (RTS) signal.
SW5
SDA
SDB
SW8
SW7
SW6
RDA
RDB
RS-232C RS-422 RS-485
ON
OFF
OFF
OFF
OFF
ON/
*3
OFF
ON
ON
ON/
*2
OFF
ON/
*2
OFF