On 12/5/23 11:26, Todd Zuercher wrote:
I think all Fanuc red cap encoders are digital. The question marks are if the
coms signal is differential quadrature or serial and if serial what format, and
what the commutation tracks/signals are or if they are rolled into the absolute
encoder serial signal.
The original red cap encoders were standard quadrature with
index, but with proprietary commutation on 4 Gray-code
signals. Later encoders (serial pulse coder) were all serial
and interpolated a 2048-cycle analog quadrature disc into
some higher resolution code. Anywhere from 32K to 1 million
counts/rev. The digital data is a 77-bit stream at 1.024
MBits/second, at least on the ones I have deciphered.
Obviously, the reason was that sending 1 Million counts/rev
was impractical with quadrature.
Jon
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