Serial communication with hex code

Question

Deo 2017-5-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/340723-serial-communication-with-hex-code

回答： 상휘 김 2022-1-7

I have one device using an asynchronous HDLC framing. And my matlab versions are 2016a and 2015b.

This device is connected to my computer via USB, but this is recognized as COM port device due to USART driver.

Anyway, I need to send hex code "0x7E, 0x23, 0x02, 0x00, 0x7D, 0x31, 0x24, 0x01, 0x0C, 0x25, 0x01, 0x0E, 0x26, 0x01, 0x03, 0x3A, 0x7E" to this device and receive response. (Terminator is 0x7E which means "~" or "126").

Can you help to make this serial communication code?

For serial setthing, I set the code like below, but I am asking this question because my code with fopen/query or fwrite and fread did not work properly.

=======================================

clear;

instrreset();

s = serial ('COM3','baudrate',115200);

set(s,'parity','none');

set(s,'databit',8);

set(s,'stopbit',1);

set(s,'timeout',1);

===============================================

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Answer 1

Jan 2017-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/340723-serial-communication-with-hex-code#answer_267385

编辑：Jan 2017-5-17

在 MATLAB Online 中打开

Perhaps:

Str = '7E2302007D3124010C25010E2601033A7E'
D   = sscanf(Str, '%2x');
fwrite(s, D, 'uint8')

This is a bold guess only. I'm still confused when somebody wants to send hex codes. Hex codes are actually a string, a vector of type char. I assume that the bytes should be sent, which are represented by these hex codes. Or do you really want to send the characters '7', 'E', ... ?

Note: I cannot test this code. Please try if it must be '%.2X' instead of '%2X'.

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Deo 2017-5-17

Jan, I solved the problem. Your code was correct, and I had problem in inverted checksum, such as "3A" at last 3rd and 4th digits of Str. Also, I added fread function like "data=fread(s);" Thanks for your help.

Jose Ignacio Mora Cordero 2021-5-24