Digital Electronics Corporation APL3600-TA, Installation Manual

Page: 8 / 18

8
Serial Mode Select Switches (SW4 to SW10) operate as shown in the circuit diagram below.
6
Switches the RD
(RXD) termination
resistance ON/OFF
Inserts
termination
resistance of
220
Ω
between
RDA and RDB.
No termination OFF ON
ON/
OFF
*3
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
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
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
ON/
OFF
*2
10 OFF OFF
ON/
OFF
*2
*1 Be sure to keep the settings, “OFF”.
*2 Set switches number 9 and 10 to ON when the SD (TXD) output driver is automatically controlled
with RS (RTS). Set switch number 4 to OFF.
Set switches number 9 and 10 to OFF when the SD (TXD) output driver is controlled with the RS
(RTS) signal. Set switch number 4 to ON.
*3 If you use the termination resistance, base your settings on the connection specifications.
Switch
No.
Description ON OFF RS-232C RS-422 RS-485
SW4
SW9
SW10
SW5
SW7
SW6
SW8
RT(RTS) Automatic
control
COM
1
SD(TXD)
RT(RTS)
SDA
SDB
RDA
RDB