Sending non-printable ascii characters via serial port

[Jay Hennessy]

Ok thanks Paul,

I had never seen the use of &H to convert from ascii to hexadecimal. 
that makes things pretty clear.

J

On Saturday, June 28, 2014 6:54:17 AM UTC-4, Paul Groot wrote:

>
> 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.h... at gmail.com <javascript:>> 
> 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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