[Scilab-users] ?==?utf-8?q? help for RS232 programming

[Samuel Gougeon]

Hello Philipp,
Thanks for the device pointer: very helpful to help you.

Le 16/08/2016 16:27, Philipp Mühlmann a écrit :
> OK,
>
> it seems I need stopbit = 2;  // at leas a working C-code has this setting
>
>
> so:
>
>  h = openserial(1," 9600,n,8,2");
.
Beware about the leading space: ," 9600,n,8,2" or  "9600,n,8,2"?
>
> but with this, I get as a result the command back as a string when I 
> use "readserial()"
>
>
> Example:
>
> h = openserial(1," 9600,n,8,2");
>
> ret = writeserial(h, " *A_r_106_0 " );
.
Same remark: there should not be any leading and trailing space: 
"*A_r_106_0"
Moreover:

  * leading "*": in the doc, it is not clear whether this char must be
    explicitly prepended to the actual command, or if it is always
    automatically prepended. Or if it must be sent apart, alone, before
    the actual command.
    You may try each method.

  * trailing "§": AFAIU the doc, it looks necessary to append "§" to
    each command. For many devices, ascii(10)==\n is used, but for this
    device, it looks to be "§". You may try with it.

>
> result = readserial(h);
.
Before reading, you may try inserting a sleep(..) to wait the answer 
before reading it. When not waiting, usually we get nothing in the 
output buffer. Noticeably because here the connection here is slow (9600 
bauds)
Try first with a quite long sleep -- say 1 second -- and when you will 
have the connexion and a proper answer, you will be able to decrease and 
tune this wait time.

HTH
Samuel

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