1. Mx6ul core module use serial -rs485 test (x)

The following is already in Iot-6ULX/EVB-6ULX The verification on the platform passed ,Iot-6ULX/EVB-6ULX Introduce the following ：

9. RS485 test  

The development board is equipped with 2 road RS485 Multiplex serial port . test RS485 A serial port , We use USB To RS485/RS422 converter UT-890 To test . The wiring diagram is as follows ：

 RS485 Connection diagram of transfer line

Before you start testing , Confirm that the corresponding jumper base on the development board has been correctly shorted .

 COM2 RS485 Schematic diagram of test jumper short circuit

 

 COM3 RS485 Schematic diagram of test jumper short circuit

  stay PC End , Open the serial port debugging assistant , The setting description is shown in the following figure .

  Serial assistant parameter settings

Execute the following instructions in the terminal , Execute the script to test the serial port , The test process is as follows “Ctrl+c” Terminate the test instruction ：

[email protected] ~# ./tty_test -d /dev/ttymxc1 -m 1 -b 115200 -l -w "ttymxc1"      // Execute... In the directory tty_test Program test equipment ttymxc1（COM2）, The test parameter is baud rate 115200, The content of the data sent is ttymxc1.

After the terminal executes the test command , You can check auto send on the serial port assistant , Or choose to send data manually . Check whether the sending and receiving data of the terminal and the serial port assistant are consistent .

  Terminal test information

By modifying the equipment serial number in the test command , Change the connection position of the adapter line , You can test another RS485 A serial port , The following is on the development board RS485 Serial port corresponding device name and test instructions .

surface 4-1  RS485 Serial port test instructions

Serial port coding	Device number	Test instruction
COM2	ttymxc1	./tty_test -d /dev/ttymxc1 -m 1 -b 115200 -l -w "ttymxc1"
COM3	ttymxc2	./tty_test -d /dev/ttymxc2 -m 1 -b 115200 -l -w "ttymxc2"