problem with usbtmc-communication

wrw at mac.com wrw at mac.com
Wed Dec 12 03:21:06 CET 2012


On Dec 11, 2012, at 3:48 PM, Jean Dubois <jeandubois314 at gmail.com> wrote:

[byte]

>> 
>> OK - I see where the examples came from, and I notice -
>> 
>>         int my_inst;
>>         my_inst=open(“/dev/usbtmc1”,O_RDWR);
>>         write(my_inst,”*RST\n”,5);
>>         close(my_inst);
>> 
>> and similarly in another place -
>> 
>>         retval=write(myfile,"*IDN?\n",6);
>> 
>> Note that both write commands contain a byte count of the number of characters to be written (\n counts as one character).
>> Again, the read commands contain byte counts.  I'm very suspicious that a write command with no byte count writes nothing, but does move a buffer pointer.
>> 
>> -Bill
> 
> Does Python support/implement simular commands? Can I use
> usbkeith.write("*IDN?\n",6) and  something simular for the reading
> commands?
> 
> thanks,
> jean
> -- 
> http://mail.python.org/mailman/listinfo/python-list

Yes of course.  BUT, that isn't really a python question, it depends on how the device driver implements the function call.

-Bill




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