Reading data on Matlab from serial device connected to raspberry pi

Hello everyone!

I will appreciate your help!

I am trying to read data on MatLab from a serial device that is connected to raspberry pi (the serial device is connected to raspberry pi and the pi is connected to a computer). The serial device is a conductivity probe that has a USB output. I tried the code below to read the data from the device, and I got an empty matrix. The conductivity probe sends data by a UART mode (it also has I2C mode, but the UART mode is the default). What should I do in order to get the data?

>> mypi = raspi

mypi = 

  raspi with properties:

         DeviceAddress: '169.254.0.2'                 
                  Port: 18734                         
             BoardName: 'Raspberry Pi 3 Model B+'     
         AvailableLEDs: {'led0'}                      
  AvailableDigitalPins: [4,5,6,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]
  AvailableSPIChannels: {'CE0','CE1'}                 
     AvailableI2CBuses: {'i2c-1'}                     
      AvailableWebcams: {}                            
           I2CBusSpeed: 100000                        

  Supported peripherals

>> myserialdevice = serialdev(mypi,'/dev/ttyUSB0')

myserialdevice = 

  serialdev with properties:

        Port: '/dev/ttyUSB0'
    BaudRate: 115200
    DataBits: 8
      Parity: 'none'
    StopBits: 1
     Timeout: 10

>> serialData = read(myserialdevice,2)

serialData =

  0×0 empty uint8 matrix

[Walter Roberson]

I am confused. Is the device using its UART to emulate USB to talk to the raspberry pi? And what code are you running on the pi?

The pi is usually communicated with using serial over USB. When you open the serial port directly - that interferes with the USB connection.

[Roger Vegeta]

Thank you Walter,

I am not sure if the device is using its UART to emulate USB. I just know that the meter has a USB output and the documentation says it has a UART mode. I am not running any code on the pi. I am just using the matlab support package. Do you mean the USB will not work as a serial port?

[Osamah Makki]

Hello

Did you find a solution for this problem Mr. Regelio Garcia ?

[Hocine YAKOUBI]

Hi,

I have the same problem( not realy I connected RX to TX so I use /dev/ttyAMA0), did you resolve it ?

Thanks

[Roger Vegeta]

@@Osamah Makki @Hocine YAKOUBI Unfortunally, I was not able to solve this problem. I ended up colllecting data from the serial device directly through a regular computer and Matlab. Best!