On 2017-12-02 11:24, Gene Heskett wrote:
I'd have really serious doubts anybody ever considered the transmission
line termination characteristics needed to preserve a perfect square
wave anyway. And if I asked that of the guy at Lowes spooling off 100
feet of that cable for me, he'd think I was suddenly talking in swahili.
Many MODBUS/RS485 papers are talking about 120 ohms bus termination and
signal reflection effects.
http://www.ti.com/lit/an/slla272c/slla272c.pdf
My VFD has a switch to active this termination on the MODBUS input.
Here is an extended study:
http://support.fccps.cz/download/adv/frr/RS485/RS485.html
However, I do not know if that is really important for the particular
case of a spindle encoder.
Just another of my war stories from 40 years in broadcast engineering. :)
I was sure that will recall nice stories about radio ;-)
Thanks.
Frederic (callsign F1OAT)
http://cnc.f1oat.org
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