User Manual

Chapter 3 Specifications
3-19
 Serial Mode Select Switch
Switch
No.
Description ON OFF
RS-232C RS-422
RS-485
(The data is not
automatically
controlled via
the RS (RTS)
signal.)
*3
RS-485
(The data is
automatically
controlled via
the RS (RTS)
signal.)
*3
1
Internal
setting
Reserved Reserved OFF
*1
*1 Be sure to leave these settings OFF.
OFF
*1
OFF
*1
OFF
*1
2
Changes
COM1’s
communication
method
RS-422/
RS-485
RS-232C OFF ON ON ON
3
Changes
COM1’s
communication
method
RS-422/
RS-485
RS-232C OFF ON 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
5
Switches the
SD(TXD)
termination
resistance ON/
OFF
Inserts
termination
resistance of
220Ω between
SDA and SDB.
No termination OFF ON ON/OFF
*2
*2 If you use the termination resistance, base your settings on the connection specifications.
*3 This setting determines whethe r or not the SD (TXD) output driver is automatically con-
trolled via the RS (RTS) signal.
ON/OFF
*2
6
Switches the
RD(RXD)
termination
resistance ON/
OFF
Inserts
termination
resistance of
220Ω between
RDA and RDB.
No termination OFF ON ON/OFF
*2
ON/OFF
*2
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 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 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 OFF ON
10 OFF OFF OFF ON