Hello all.
Up to now, ive been using a daq6211 in conjunction with a renco hollow shaft encoder using the linear encoder positioning vi . It works perfectly counting the A & B channels and im using it on a single axis platform. I since have added an extra axis to my system and thus I am now using another hollow shaft encoder on this additional platform.
My problem is that I cant get both encoders to work at the same time on the daq 6211 while sharing the 5v and gnd on board supply. When i connect them both up, nothing happens but when i take one of them off the 5v power supply the other works fine. It seems that the power requirement for both encoders is exceeding that of the 5v on board supply
I then tried to give each of them a separate 5v supply. One with the 6211 and the other from a daq 6008 5v supply. The one connected to the daq 6211 works perfect but the one recieving the daq 6008 5v supply gives spurious results making it seem as if theres a ton of noise
distorting the signal. Ive even tried powering both the encoders with a separate usb device that has a 5v supply but both of the encoders give spurious resullts.
If i try each encoder individually powered by the daq 6211, they work perfectly.Would a separate 5v dedicated supply work for me here or do the encoders need to have the supply directly from the device thats counting, i.e. the daq 6211. If i do get a separate power supply will i have to limit its current as I imagine the signal lines will carry the supply current to the daq and damage it. Maybe Im totally off here?.
What is the usual protocol when multiple sensors are connected to USB daqs and their overall power requirement exceeds that of the 5v on board supplies?
Apologies for the long winded post guys but clearing this up will really help. I'm really lost this time and I would really appreciate if anyone has any input on this matter.
Thank you in advance.
