Changing range

Hallo everybody,

I have to change the range from -5V - 5V to a more suitable range of 0V -
10V, or better 0V - 5V. I have the ni_labPC board. I tried using the
comedi_get_range() function passing argument
    range=1
for having the range set on the 0 -10 scale. This thing does not works while
I'm trying to write this value on the board, I'm still measuring the
range -5 - 5 V, even if I'm telling the board to wirte values between 0V -
9.99V

Does anybody has an idea how can I simply manipulate the range to the
desired one? Should I set the comedi_krange structure? how?

thanks,
	Regards,
		Daniel

here's my sample code:

int subdev = 1;
int chan = 1;
int range = 1;  //range between 0 and 10.. hopefully...
int aref = AREF_GROUND;
lsampl_t data;
comedi_t *device;
comedi_range *rangeC;
float PHYdata = 9.99; //set this to change the desired output

  device=comedi_open("/dev/comedi0");

  rangeC = comedi_get_range( device,
                             subdev,
                             chan,
                             range);

  printf("CRange - min: %f  max: %f unit: %d\n", 
			rangeC->min, rangeC->max, rangeC->unit);

  int maxdata = comedi_get_maxdata(device, subdev, chan);

  data=comedi_from_phys(PHYdata,rangeC,maxdata);

  comedi_data_write(  device,
                      subdev,
                      chan,
                      range,
                      aref,
                      data);

Received on 2003-06-06Z18:53:50