Doubt with encoders and UMI7774

[Giridhar_Rajan]

Hi all,

I have NI, PCI7344 motion controller with UMI 7774. I am trying to read the counts of an encoder. The encoder gives 3 signals, i.e. A,B and Index. The encoder does'nt give A bar , B bar and Index bar signal. Can I still read the encoder pulses in labview with the above hardware? Is there a work around?  Earlier I had UMI 7764 with PCI-7344 in my previous project. I had used this kind of encoder successfully with UMI7764. Do I need to change my encoder and get the one which gives the inverted pulses too, to use it with UMI7774.

Regards,

Giridhar Rajan

Automation Engineer, Design

Cruiser Controls

Mumbai, India

[Giridhar_Rajan]

Got it. I used IC7404 NOT gate to get the inverted signals of A,B and Index. It works fine.

Regards,

Giridhar Rajan

Automation Engineer, Design

Cruiser Controls

Mumbai, India

[mayihelpu]

Hi,

Hey that OK you have used 7404.But I would suggest using AM26C31 which is quadrature differential line driver.

In this particular you will give the Input and in Output you will be getting Input as well as the inverted input.i.e

If you give A as an Input , In Output you will be getting A as well as A bar.

Regards

Manish karnik

Application Engineer

Mumbai, India

[Giridhar_Rajan]

Thanks Mr.Manish. I was just wondering how I can get a perfect 5V signal at the output of 7404. You reply seems to have solved my problem. I think I should try AM26C31 driver for better results with high resolution encoders. Thanks a lot.

Regards,

Giridhar Rajan

Automation Engineer, Design

Cruiser Controls

Mumbai, India