Realtimes Beijing Technology Co.,LTD
Manual for RTSO-9001 V2.0
25
Function
Multifunction select dial - code switch
The board
level
RTSO-9001B
(
The lower plate
)
Marking
SW2
Type
8-bit multifunction dial code switch
Descriptio
n
The user can configure 120 ohm matching resistance by turning on and
off BIT4, BIT5, BIT6 and BIT8 of SW2.
Pin define
serial port
0
Mode
selection
BIT4
BIT5
Explain
232
Mode
OFF
OFF
Mode 232 does not support
this
422
Mode
ON/OFF
OFF
BIT4 ON turns ON the
matching resistor
BIT5 is useless, set OFF bit
485
Mode
ON/OFF
ON/OFF
BIT4 ON opens the receiver
to match the resistance
BIT5 ON opens the sender
to match the resistance
serial port
1
Mode
selection
BIT6
BIT8
Explain
232
Mode
OFF
OFF
Mode 232 does not support
this
422
Mode
ON/OFF
OFF
BIT6 ON turns ON the
matching resistor
BIT8 is useless, set OFF bit
485
Mode
ON/OFF
ON/OFF
BIT6 ON opens the receiver
to match the resistance
BIT8 ON opens the sender
to match the resistance
The mapping files of serial port 0 and serial port 1 in Linux system are
ttyS0 and ttyTHS2 in /dev directory respectively.