On Thu, 11 Apr 2019, Gene Heskett wrote:
Unfortunately you cannot do this currently since MODBUS is not supported by
the Hostmot2 UART driver
Date: Thu, 11 Apr 2019 17:56:45 -0400
From: Gene Heskett <ghesk...@shentel.net>
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)" <firstname.lastname@example.org>
Subject: [Emc-users] For PCW
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?
Analog control may be better for things like rigid tapping since the normal
MODBUS driver is a userland task (and I'm not sure how real time the MODBUS
implementation in the VFD is.
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.
If you have a spindle encoder, that a better way to get speed feedback
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?
Fater slow-down and faster reversals if tapping (better control of depth)
Thanks for any advice Peter.
Cheers, Gene Heskett
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