7
Serial Mode Select Switch
Switch
No.
Description
ON
OFF
RS-232C RS-422 RS-485
1
Internal setting
Reserved
Reserved
OFF
*1
*1 Be sure to keep the settings, “OFF”.
OFF
*1
OFF
*1
2
Changes COM1’s
communication
method
RS-422/RS-485
RS-232C
OFF
ON
ON
3
Changes COM1’s
communication
method
RS-422/RS-485
RS-232C
OFF
ON
ON
4
Changes SD (TXD)
data’s output mode
SD (TXD) data
output is
controlled via the
RS (RTS) signal.
SD (TXD) data
output is NOT
controlled via the
RS (RTS) signal.
(normally output)
OFF
ON/
OFF
ON/
OFF
*2
*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.
5
Switches the SD
(TXD) termination
resistance ON/OFF
Inserts
termination
resistance of
220
Ω
between
SDA and SDB.
No termination
OFF
ON
ON/
OFF
*3
*3 If you use the termination resistance, base your settings on the connection specifications.
6
Switches the RD
(RXD) termination
resistance ON/OFF
Inserts
termination
resistance of
220
Ω
between
RDA and RDB.
No termination
OFF
ON
ON/
OFF
*3
7
Switches the
shorting of SDA and
RDA ON or OFF
Shorts SDA and
RDA
(RS-485 mode)
No shorting
(RS-422 mode)
OFF
OFF
ON
8
Switches the
shorting of SDB and
RDB ON or OFF
Shorts SDB and
RDB
(RS-485 mode)
No shorting
(RS-422 mode)
OFF
OFF
ON
9
RS (RTS) Automatic
control mode
(enabled only when
RS-485 mode)
The data is
automatically
controlled via the
RS (RTS) signal.
The data is not
automatically
controlled via the
RS (RTS) signal.
OFF
OFF
ON/
OFF
*2
10
OFF
OFF
ON/
OFF
*2
