Realtimes Beijing Technology Co.,LTD
Manual for RTSO-9001 V2.0
26
4.14 serial port
（
J4
）
Function
Serial communication connector
The board
level
RTSO-9001T
（
The upper plate
）
Marking
J4
Type
2.0mm ,2x5Pin Double row pins
Descriptio
n
RTSO-9001 provides two RS232/RS422/RS485 serial communication
interfaces. Users can use BIT1, BIT2 and BIT3 on the dial code switch
SW2 to select the mode.
Pin define
Mode 0
Data loop mode, serial transceiver internal loop
* note 1
Dial Switch
State
Pin
Signal
Pin
Signal
000
BIT1 OFF
BIT2 OFF
BIT3 OFF
1
NC
2
NC
3
NC
4
NC
5
GND
6
GND
7
NC
8
NC
9
NC
10
NC
Mode1
Two and a half duplex 485* note 2
Dial Switch
State
Pin
Signal
Pin
Signal
001
BIT1 ON
BIT2 OFF
BIT3 OFF
1
U0_485_A
2
NC
3
U0_485_B
4
NC
5
GND
6
GND
7
U1_485_A
8
NC
9
U1_485_B
10
NC
Mode2
232 one way, 485 one way
Dial Switch
State
Pin
Signal
Pin
Signal
010
BIT1 OFF
BIT2 ON
BIT3 OFF
1
U0_232_TX
2
U0_232_RX
3
U0_232_RTS
4
U0_232_CTS
5
GND
6
GND
7
U1_485_A
8
NC
9
U1_485_B
10
U1_232_CTS
Pin-1
：
The green box on the right.
Pin-2
：
The red box on the right.
