[Tutor] Re: sending hex data on port

[Jeff Shannon]

vicki@stanfield.net wrote:

>>What module are you using?  Does it make sense to say
>>port.write(chr(24))?
>>    
>>
>
>That might be it. Is there a function that
>automatically translates between the 0x18 and the chr
>value that I need? I understand how you got the value
>and could write my own, but if it already exists.....
>  
>

This depends on exactly what form you have the 0x18 in.  You can simply 
use port.write(chr(0x18)), but I'm guessing that you want to send the 
contents of a variable, not a constant.  :)  If you have a variable, c, 
which already contains the number 0x18, you can do port.write(chr(c)). 
 If c is, instead, the string "18", and you want to interpret that as a 
hex value, then you can use the radix option of int() -- 
port.write(chr(int("18", 16))).  In essence, your problem now is a 
matter of figuring out how to convert your data source into a series of 
integers, one for each byte you wish to send.

Jeff Shannon
Technician/Programmer
Credit International