Sending non-printable ascii characters via serial port

[Paul Groot]

Jay,

You can use the WriteBytes function for this:

Dim arrData(4) As Integer
arrData(0) = 40
arrData(1) = 30
arrData(2) = 35
arrData(3) = 30
arrData(4) = &H2A

Serial.WriteBytes arrData

With some additional code you could make a nice function out of this that
automatically calculates and adds the checksum value.

Best,
Paul



On 25 June 2014 22:20, Jay Hennessy <tjay.hennessy at gmail.com> wrote:

> Hi all,
>
> Maybe someone can help me with this problem.
>
> I want to send a string to a serial port to control a TMS machine during
> an EEG experiment. I already know how to send strings using Serial.Write
>
> The problem is that the standards for the TMS machine require the last
> character of the string to be a check bit. You calculate it by first adding
> up the hexadecimal equivalents of the other characters then taking the
> inverse. This is now your check bit or check character added to the end of
> the string.
>
> example: if i want to send @050
>
> ascii      hex
>
> @     =    40
> 0       =    30
> 5       =     35
> 0       =     30
>
> 40+30+35+30 = D5
>
> so the inverse is = 2A
>
> and 2A in hex is * in ascii
> so I would send the string @050* and everything should work.
>
> The problem is that if my check bit becomes a non-printable ascii
> character, how should I send it?
>
> for example my check bit might be 1C in hex which is 'file seperator' in
> ascii. This isn't a character I can send using Serial.Write in Eprime (at
> least that I know of).
> Can anyone think of a way around this problem?
> I might be able to send bits instead of a string. Is sending bits
> something Serial.Write can do? can eprime convert things to bits?
>
> Any help would be appreciated.
>
> Thanks
>
> jay
>
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