Use absolute encoder to get positioning

[melvinfeng]

HI,

i am actually refering to the  vi attached. which i missout in my previous post. 

And the error can be found by compare the datasheet of the encoder and the output of the vi. 

i actually found that number in the text file changed randomly instead of followed the pattern on the data sheet. 

Therefore i am quite unsure if i program the encoder wrongly or the encoder is spoiled. 

can you suggest why it happens?

Thank you very much !  

Best regards, 

Melvin 

[melvinfeng]

 Thanks for your reply. 

 The DAQ set i am actually using is NI USB-6218 BNC, there are 8 digital input channels. 

And the encoder has 8 output pins, therefore i connect the 8 output pins to 8 digital input channels. Then i convert the input boolean array to number and output to the text fie, which i need the continuous data. 

However, i actually found that the output of the data does not follow the pattern in the datasheet, could you suggest why it happens?

Thanks a lot! 

Best regards, 

Melvin 

[melvinfeng]

Hi, 

Yes it is GrayCode, but i actually treat GrayCode as a form of boolean array, and convert it to the decimal numbers, which i plan to do a one-to one map to the datasheet in the next stage.

is this wrong?

Thanks a lot for your reply 

Best regards, 

Melvin 

[BFeigum]

Your latest VI still has 8 DAQ VIs. The problem with this is that they will not run at the same time! You are still sampling each input one at a time. 

You need to take a look at apok's reply and change the way that you are sampling the DAQ. You need to have ONE DAQ VI that samples all 8 inputs at the same time. 

[melvinfeng]

Hi Apok, 

 I am currently using an old version labview 10.0. 

Is it possible for you to help me to convert the vi to labview 10.0 compatible? I am refering to the digital_SW_timed inut.vi attached. 

Thank you very much! 

Best regrards, 

Melvin 

[melvinfeng]

Hi, 

Thanks for your reply. 

 I am currently using an old version labview 10.0. 

Is it possible for you to help me to convert the vi to labview 10.0 compatible? I am refering to the digital_SW_timed inut.vi attached. 

Thank you very much! 

Best regrards, 

Melvin 

[apok]

you could always goto the version conversion forum...did you look through your NI shipped Examples?