Greetings Peter;

The new vfd materialized here today, and I see it actually has what it 
calls an RS485 interface, a teeny little white 3 pin socket on its 

And I have one or two 422 to 485 translators, the $2 variety, that I 
believe are duplex capable as I had to wire them to a solid logic level 
on the 5i25 end of them before they would take the balanced signals from 
the encoder I put on the spindle motor of my G0704, and make nice 5 volt 
rail to rail square waves to feed the 5i25.

If I jury rig the separate 422 lines end of that to the 422 terminals on 
that 7i76D, can I talk to a huan yueng lookalike?  That is what I 
supposedly bought but the instruction booklet makes no brand claims.

It is a YL-620-A, and it also has the usual analog interface too.
It claims no ascii, but supports the modbus RTU protocol, and mentions 
modbus several times..  Am I better off useing the analog, or is the 
RS-485 the better control?

I also see an AO output, but its reads like 0-5 volts, which doesn't 
sound like it would work to indicate the achieved speed via one of the 
A/D's on the 7i76D when the 7i76 goes to about 38 volts full scale.

This is the first vfd I've had that actually has braking R terminals, and 
says optional, but if used s/b 100 ohms, 100 watt.  What advantage would 
hooking one of those up amount to?

Thanks for any advice Peter.

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <>

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