User manual

Chapter 1 Overview
1-9
Table (2) DIPSW2
(The factory settings are all OFF.)
*1 If you use termination resistance, base your settings on your connection specifications.
DIPSW2 (SW4 to SW8) in the above table 2 operate as shown in the circuit diagram below.
Fig. 1 DIPSW2 (SW4 to SW8) circuit diagram
DIPSW2
No.
Description ON OFF
RS-
232C
RS-422 RS-485
1
Changes COM1
(RS-232C) #9 pin
(RI <-> +5V)
+5V 500mA
external output
possible
RI
ON/
OFF
ON/
OFF
ON/
OFF
2
Changes COM3's
communication method
RS-422/RS-485 RS-232C OFF ON ON
3
Changes COM2
(RS-232C) #9 pin
(RI <-> +5V)
+5V 500mA
external output
possible
RI
ON/
OFF
ON/
OFF
ON/
OFF
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
5
Switches the TX
termination resistance
ON/OFF
Inserts termina-
tion resistance of
220Ω between
TXA and TXB.
No termination OFF ON
ON/
OFF *
1
6
Switches the RX
termination resistance
ON/OFF
Inserts termina-
tion resistance of
220Ω between
RXA and RXB.
No termination OFF ON
ON/
OFF *
1
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
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
9
Changes COM3's
communication method
RS-422/RS-485 RS-232C OFF ON ON
10 Used by the system Reserved Reserved OFF OFF OFF
T
XD
R
TS
SW4
SW5
SW7
SW6
SW8
TXA
TXB
RXA
COM3
RXB