Chapter 2 Specifications
2-13
Switch
No.
Description
ON
OFF
RS-232C
RS-422
RS-485
(Data is not
automati-
cally con-
trolled via the
RTS sig-
nal.)
*1
*1
This setting determines whether or not the TXD output driver is automatically controlled via the
RTS signal.
RS-485
(Data is
automati-
cally con-
trolled via the
RTS sig-
nal.)
*1
1
Used by the system.
No Connection
No Connection
OFF
*2
*2
Be sure to keep the settings, "OFF".
OFF
*2
OFF
*2
OFF
*2
2
Changes COM3's
communication
method
RS-422 /
RS-485
RS-232C
OFF
ON
ON
ON
3
Changes COM3's
communication
method
RS-422 /
RS-485
RS-232C
OFF
ON
ON
ON
4
Changes TX data's
output mode
TX data output is
controlled via the
RTS signal.
TX data output is
NOT controlled via
the RTS signal.
(normally output)
OFF
ON/OFF
ON
OFF
5
Switches the TX
termination resistance
ON/OFF
Inserts termination
resistance of
220
Ω
between
TXA and TXB.
No termination
OFF
ON
ON/OFF
*3
*3
If you use the termination resistance, base your settings on the connection specifications.
ON/OFF
*3
6
Switches the RX
termination resistance
ON/OFF
Inserts termination
resistance of
220
Ω
between
RXA and RXB.
No termination
OFF
ON
ON/OFF
*3
ON/OFF
*3
7
Switches the shorting
of TXA and RXA ON
or OFF
Shorts TXA and
RXA (RS-485
mode)
No shorting
(RS-422 mode)
OFF
OFF
ON
ON
8
Switches the shorting
of TXB and RXB ON
or OFF
Shorts TXB and
RXB (RS-485
mode)
No shorting
(RS-422 mode)
OFF
OFF
ON
ON
9
RTS Automatic
control mode
*1
(enabled only when
RS-485 mode)
The data is
automatically
controlled via the
RTS signal.
The data is not
automatically
controlled via the
RTS signal.
OFF
OFF
OFF
ON
10
OFF
ON
Table2) Serial Mode Select Switches
