Serial Data signal Generation

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Ibnul Feraji Alam 2022-3-9

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https://ww2.mathworks.cn/matlabcentral/answers/1667314-serial-data-signal-generation

评论： Benjamin Thompson 2022-3-15

How to generate a signal of fixed length of 6 bytes. The massage are transfered in 15ms cycle. Baud rate 38400, data bits 8, parity none, stop bits 1, CRC 16.

Example signal : AA 20 AA 02 IC IE.

Serial Data Format

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Benjamin Thompson 2022-3-9

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https://ww2.mathworks.cn/matlabcentral/answers/1667314-serial-data-signal-generation#answer_913814

See if one of the examples on the File Exchange will work for you:

https://www.mathworks.com/matlabcentral/fileexchange/?category%5B%5D=simulink%2Findex&q=serial

Then if you run into problems ask a specific question and post your work.

If your device needs software flow control, the Instrument Control Toolbox functions do not support that. But if STX and ETX can just be at the beginning and end of your byte string then just send 8 bytes every time instead of 6. You can combine bytes together into a vector using the mux or vector concatenate blocks per my sample diagram. Use the serial configuration block to set up your baud rate and other parameters. You want your model, or at least the serial send block, to have a step size of 0.015 seconds, and run the model in Real Time mode (use the Simulation Pacing option under the Run button in Simulink). Your CRC algorithm could probably be coded up in a MATLAB Function Block for Simulink, or maybe try the "General CRC Calculator" block in the instrument control toolbox library.

Remember that Windows is only a soft real time OS at best, so for timing you are probably only going to be in the +/- 10-15 ms range on the timing accuracy.

I am not sure what you are meaning by convert all byte to ASCII, but the ASCII to String block in the Simulink String library may help with something like that.

Ibnul Feraji Alam 2022-3-15

I am having trouble over sending the signal over serial send block.

Which generator signal I need to use. Like if I want to send hex "AA" or decimal "170" or binary "10101010" which "create and connect generator" I need to use. Also If you could tell me the parameters that would be helpful.

Is there anything needed to be changed for the header and terminator?

Thank you.

Benjamin Thompson 2022-3-15

I don't know what the "create and connect generator" does. Connect a constant source block to your Serial Send Block input. Give the constant block a value of 170 decimal, and configure its output data type to uint8.

As for the other parameters, it is your device. The header and terminator could be your STX and ETX characters. Blocking mode, you may have to try it with and without that checked to see what works best for timing.

Then when you are sure the serial port is sending out three bytes (STX + 170 + ETX), then make the middle part the full six bytes long using the mux block like I showed in my example.

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