Proface APL3000B - Node Box PC User Manual
Page 37
PS-3450A Series Hardware Manual
2-14
Serial Mode Select Switches (SW4 to SW10) operate as shown in the circuit diagram below.
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/OFF
5
Switches the TX
termination
resistance ON/OFF
Inserts
termination
resistance of
220
Ω between
TXA and TXB.
No termination
OFF
ON
ON/OFF
*2
6
Switches the RX
termination
resistance ON/OFF
Inserts
termination
resistance of
220
Ω between
RXA and RXB.
No termination
OFF
ON
ON/OFF
7
Switches the
shorting of TXA
and RXA ON/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/OFF
Shorts TXB and
RXB.
(RS-485 mode)
No shorting
(RS-422 mode)
OFF
OFF
ON
9
RTS Automatic
control mode
(enabled only when
RS-485 mode)
The data is
automatically
controlled via the
RTS signal.
The data is not
automatically
controlled via the
RTS signal.
OFF
OFF
ON/OFF
*3
10
OFF
OFF
ON/OFF
Table2) Serial Mode Select Switches
*1
Be sure to keep the settings, "OFF" for RS-422 or RS-485.
*2
If you use the termination resistance, base your settings on the connection specifications.
*3
To control TX output driver via RTS automatically, set ON. Be sure to set SW No.4 OFF.
To control TX output driver via RTS signal, set OFF. Be sure to set SW No.4 ON.
Switch
Number
Description
ON
OFF
RS-232C
RS-422
RS-485
TXD
RTS
SW4
SW9
SW10
SW5
SW7
SW6
SW8
TXA
TXB
RXA
RXB
RTS Automatic control
COM2