E-9
4
Dip Switches
The dip switches are located on the circuit board inside the PS-A unit's rear cover. For informa-
tion about removing the Rear cover,
6. Installation.
The factory settings are all OFF.
Dip
Switches
Description
ON
OFF
RS-232C
(COM1)
RS-232C
(COM2)
RS-422
(COM2)
RS-485
(COM2)
1
Changes #9 pin
(RI <-> +5V)
+5V 500mA external output
possible
RI
ON/OFF ON/OFF ON/OFF ON/OFF
2
Changes COM2's
communciation method
RS-422/RS-485
RS-232C
OFF
OFF
ON
ON
3
Changes COM2 (RS-232C)
#9 pin (RI <-> +5V)
+5V 500mA external output
possible
RI
ON/OFF ON/OFF ON/OFF ON/OFF
4
Changes TX data's output
mode
TX data output is NOT
controlled via the RTS signal
TX data output is controlled
via the RTS signal. (normally
output)
OFF
OFF
ON/OFF
ON
5
Switches the TX termination
resistance ON/OFF
Inserts termination
resistance of 220
Ω
between
TXA and TXB.
No termination
OFF
OFF
ON
ON/OFF
*1
6
Switches the RX termination
resistance ON/OFF
Inserts termination
resistance of 220
Ω
between
RXA and RXB.
No termination
OFF
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
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
OFF
ON
9
Changes COM2's
communciation method
RS-422/RS-485
RS-232C
OFF
OFF
ON
ON
10
No Connection
-
-
-
-
-
-
<DIPSW2>
TXD
RTS
SW4
SW5
SW7
SW6
SW8
TXA
TXB
RXA
COM2
RXB
The COM2 compatible Serial Mode Select Switches (SW4 to SW8) operate as
shown in the circuit diagram below.
PS-A Inside
*1
If you use the termination resistance, base your settings on the connection specifications.
