How to send an ASCII code via matlab : fwrite or fprintf ?

How to send an ASCII code via matlab : fwrite or fprintf ? For example the code 'A30005". Do I need to add something like %s : fprintf(com1,'%s","A30005') Best regards Stanislas

Answer 1

[Walter Roberson]

You an use either call. fprintf() like Thorsten shows, or

fwrite(com1, 'A30005')

If you need to send a terminator (CR or LF) then fprintf() is usually easier

fprintf(com1, '%s\n', 'A30005')

[Stan sdsd]

What does "terminator (CR or LF)" mean pleas ? and what does the "/n" after the %s (that I know already). Thanks for your quick response by the way.

[Walter Roberson]

CR is Carriage Return, the 13'th ASCII character.

LF is Linefeed, the 10'th ASCII character.

Different systems mark the ends of lines in different ways. Some want just CR, some want just LF, some want CR followed by LF. There is no "right" way; you just have to match what the hardware demands.

In formats, \n (backslash, not forward slash) stands for "line terminator". It will be converted in to whatever character or character pair has been configured for the Terminator property associated with the serial port, which is the same sequence that fgetl() or fscanf() would look for to mark the end of a line when it is input from the serial port.

[Stan sdsd]

Okay, I have from my communication settings, a terminator in LF, so linefeed. And the terminator associated seems to be in wikipedia U+000A. So I have to use fprintf with %s\n and "my text", and after I have to send "U+000A" ? Best regards Stan

[Walter Roberson]

If you use %s\n as your fprintf() format, then the U+000A will automatically be sent. The \n means to send the linefeed, which is U+000A

Answer 2

[Thorsten]

Just make sure to get the marks right:

fprintf(com1, '%s', 'A30005')

[Stan sdsd]

oh nice, I didn't notice my mistake