question about write to serial

I want to write this string to the serial, but the signal is wrong. How to wirte this code? Thank you!!!

[Taylor]

It's hard to say what's going wrong without knowing what device you're writing to. Is app.SerialObject defined as a property in the app? If you can share the app code that would be great.

[Walter Roberson]

Did you remember to take into account Start Bit and Stop Bit?

Did you remember to take into account that bits are transmitted "least significant bit" first? (which is "right to left" compared to the usual way of writing bit sequences)

Did you remember to take into account that binary 0 is transmitted as MARK condition ("on") and binary 1 is transmitted as SPACE ("off") condition?

[Weiyue]

Dear Walter Roberson, thank you for your answer. I found the question is that each 8-bits data has a start bit and stop bit as you said. So if there are some ways to remove the start bit and stop bit to make the signal continuous? Thank you very much!

[Walter Roberson]

When you are measuring the wire signal levels of RS232, then the Start and Stop bits are unavoidable.

Side note: the Start bit is a different length than the Stop bit. I seem to recall that the Stop bit is half of the length of other bits.

Answer 1

[Supraja]

Hi,

It seems like sending deimal values inside the function would help in this case.

Please use the code as below:

write(app.SerialObject, [85, 86, 87, 88], "uint8"); % Decimal equivalents of binary numbers

Refer to 'write' function documentation below for further reference:

https://in.mathworks.com/help/matlab/ref/serialport.write.html

I hope this helps!