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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,
The factory settings are all OFF.
Dip
Description
Switches
Changes #9 pin
1
(RI <-> +5V)
Changes COM2's
2
communciation method
Changes COM2 (RS-232C)
3
#9 pin (RI <-> +5V)
Changes T X data's output
4
mode
Switches the TX termination
5
resistance ON/OFF
Switches the RX termination
6
resistance ON/OFF
Switches the shorting of T XA
7
and RXA ON or OFF
Switches the shorting of T XB
8
and RXB ON or OFF
Changes COM2's
9
communciation method
10
No Connection
*1
If you use the termination resistance, base your settings on the connection specifications.
The COM2 compatible Serial Mode Select Switches (SW4 to SW8) operate as
shown in the circuit diagram below.
TXD
SW4
RTS
PS-A Inside
ON
+5V 500mA external output
possible
RS-422/RS-485
+5V 500mA external output
possible
TX data output is NOT
controlled via the RTS signal
Inserts termination
resistance of 220Ω between
TXA and TXB.
Inserts termination
resistance of 220Ω between
RXA and RXB.
Shorts T XA and RXA
(RS-485 mode)
Shorts T XB and RXB
(RS-485 mode)
RS-422/RS-485
-
SW5
SW7
SW6
6. Installation.
<DIPSW2>
RS-232C
OFF
(COM1)
RI
ON/OFF ON/OFF ON/OFF ON/OFF
RS-232C
OFF
RI
ON/OFF ON/OFF ON/OFF ON/OFF
TX data output is controlled
via the RTS signal. (normally
OFF
output)
No termination
OFF
No termination
OFF
No shorting
OFF
(RS-422 mode)
No shorting
OFF
(RS-422 mode)
RS-232C
OFF
-
-
TXA
TXB
SW8
RXA
RXB
RS-232C
RS-422
RS-485
(COM2)
(COM2)
(COM2)
OFF
ON
ON
OFF
ON/OFF
ON
ON/OFF
OFF
ON
*1
ON/OFF
OFF
ON
*1
OFF
OFF
ON
OFF
OFF
ON
OFF
ON
ON
-
-
-
E-9
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