Digital Electronics PS3651A-T42S-24V Installationshandbuch - Seite 8

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Switch
Description
No.
Switches the TX
5
termination resistance
ON/OFF.
Switches the RX
6
termination resistance
ON/OFF.
Switches the shorting
7
of TXA and RXA ON or
OFF.
Switches the shorting
8
of TXB and RXB ON or
OFF
RTS Automatic control
9
mode
(enabled only when
10
RS-485 mode).
Serial Mode Select Switches (SW4 to SW10) operate as shown in the circuit diagram below.
RTS Automatic
control
*1 To enable RTS automatic control of the TX output driver, set SW No. 9 and 10 ON, and set SW No.
4 OFF.
To enable control of the TX output driver via RTS signals, set SW No. 9 and 10 OFF, and set SW No.
4 ON
*2 If you use the termination resistance, base your settings on the connection specifications.
ON
Inserts termination
resistance of 220Ω
between TXA and
TXB.
Inserts termination
resistance of 220Ω
between RXA and
RXB.
Shorts TXA and
RXA
(RS-485 mode)
Shorts TXB and
RXB
(RS-485 mode)
The data is
automatically
controlled via the
RTS signal.
Table 2) Serial Mode Select Switch
8
OFF
No termination
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
RTS signal.
RS-232C
RS-422
ON
ON
OFF
OFF
OFF
OFF
RS-485
ON/
*2
OFF
ON/
*2
OFF
ON
ON
ON/
*1
OFF
ON/
*1
OFF