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PICList Thread
'Re. Optical encoders and Telescope Control'
1998\01\28@071708 by Philip Cowley

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Many thanks for everyone who has helped me with this subject....

After having a good look at the HCTL2016 chip... I think I can do the whole
job with it alone (ok one for each stream...)

I have a 24bit wide I/O card for my PC with which I can drive the 2016s... A
two chip solution!!!!!!

The only problem I can see is the distance from the encoders to the PC...
about 30 feet!!! If I put the 2016s right by the encoders then I hav a long
parallel cable... Not good! But if I put the 2016s next to the PC then I
have long leads carrying the quadrature signals... Very noisy.... Any
ideas???


Phil

1998\01\28@100005 by Mike Watson

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In message  <01bd2be6$5431bc60$spam_OUT083d11acTakeThisOuTspamheartofgold.satellites.twin.dev>> .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU writes:
> Many thanks for everyone who has helped me with this subject....
>
> After having a good look at the HCTL2016 chip... I think I can do the whole
> job with it alone (ok one for each stream...)
>
> I have a 24bit wide I/O card for my PC with which I can drive the 2016s... A
> two chip solution!!!!!!
>
> The only problem I can see is the distance from the encoders to the PC...
> about 30 feet!!! If I put the 2016s right by the encoders then I hav a long
> parallel cable... Not good! But if I put the 2016s next to the PC then I
> have long leads carrying the quadrature signals... Very noisy.... Any
> ideas???

Put the 2016s by the encoders, put a PIC by the 2016s and use rs232 to
the PC.

Cheers,

Mike

1998\01\28@101804 by Ricardo Seixas

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At 12:14 28/01/98 -0000, you wrote:
>Many thanks for everyone who has helped me with this subject....
>
>After having a good look at the HCTL2016 chip... I think I can do the whole
>job with it alone (ok one for each stream...)
>

       There's also the LS7166 it's a quadrature decoder and 24 bit Up/down cou
nter
and a count frequency up to 10 Mhz !!!
       I'm using these chips with a 2048 pulses per rev. encoder (8192 position
s
in X4 mode),
a 16F84 control the chip and send the data in a RS485 line.
       To test if the chip lose a count, i've attached an elastic line (1 meter
in length)
to the encoder axle and played like a guitar, I'm unable to lose a count even
pushing the line hard !!!


>I have a 24bit wide I/O card for my PC with which I can drive the 2016s... A
>two chip solution!!!!!!
>
>The only problem I can see is the distance from the encoders to the PC...
>about 30 feet!!! If I put the 2016s right by the encoders then I hav a long
>parallel cable... Not good! But if I put the 2016s next to the PC then I
>have long leads carrying the quadrature signals... Very noisy.... Any
>ideas???

       You can do a decoder board with the 2016 or LS7166 and control it with a
PIC
and send the result in a serial line RS232 (RS485 if using more than one
encoder)
       Another solution is to use the encoder with 2 MAX485 and another 2 on th
e
I/O card in a RS485 like aproach.

       You can get the LS7166 datasheets on http://www.usdigital.com

Hope this Helps

Ricardo Seixas

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