Learning how to use a quadrature encoder

[jwolf]

Here is my first post....

My question involves use of NI cDAQ 9411 and a Unimeasure TTL encoder.  This is all very new to me, actually my first endeavor. First off, I am wanting to veryify my pinout connections, I have tried a few configurations based on the help topics I have reviews.  I am unsure if the Ao and B0 channels need to be connected?  I am using the encoders to build up a deflection / load measurement system.  I have seem mutltiple ways to hook these things up.  (The pinout of my devices are in the attached PDF document)

Also, I am curious if there are any tutorials specifically for the NI9411 and an encoder.  I have been trying to use signal express, but I keep getting "Clock" errors.  I have not got  to the point to actually see counting or measuring when I pull on the encoder string.  Perhaps there is a good tutorial explaining the use of clocks? 

Thanks! 

[JB]

See pages 9, 11 and 13 of the user manual.
A0 and B0 are the inverted signals of A and B and are useful in noisy environment or in the case of long cables. The user manual shows both wirings.

I would suggest to first test the wiring with MAX (Measurement and Automation eXplorer).

[jwolf]

JB,

Thank you for your reply.  I am going to go through my hookups again, I will then use the MAX to check verify my wiring.

[jwolf · Accepted solution]

After many hours of searching and help I found a solution to the issue.  The issue had to deal with providing an external power source to the 9411 modules.  THe 9411 apparently could not power my 5 volt encoder.  Fortunalty, this was an easy fix.  Thanks!

My next question is in regards to using multiple encoders with my chassis.  I have been spending the day sorting though the various posts trying to sort through the best way to make this happen.  I am unsure if I should by using "Tasks" or if I should be using the Express DAQ Assistant.  I am using cDAQ 9172 and the 9411 modules in slots 5 and 6.  I would like to aquire continous information from the encoders.

I would appreciate any assistance.

Thanks! ~J