On Wed, 25 Mar 2020, Curtis Dutton wrote:
Date: Wed, 25 Mar 2020 12:10:22 -0400
From: Curtis Dutton <curtd...@gmail.com>
Reply-To: EMC developers <emc-developers@lists.sourceforge.net>
To: EMC developers <emc-developers@lists.sourceforge.net>
Subject: [Emc-developers] pktuart -> rs-485
My current project is connecting a pktuart -> 6i25 -> 7i84 ->yaskwa rs-485
encoder.
Did you mean 7I85?
I was able to compile custom hostmot2 firmware with 4 pktuart and 4 sserial
components.
I have a provisional hal component that is able to send data through 2
pktuart modules that wired together via the 7i84 and send bits back and
forth at 2 Mbps which is the frequency that yaskawa encoders function at.
The encoders use a 2 wire bi-directional rs-485 protocol so I purchased
some mesa 485x1 Rs-485/RS-422 adaptors.
I can't seem to get them to work.
Are the RS-485 enables connected to PktUART TXEN pins and do they have the
correct polarity? (Active low)
Note that there is a fairly recent fix in the TXEN delay function of the PKtUART
so it should probably be set to 0 for testing
My testing plan is to get pktuart 0 to communicate with pktuart 1 with 2 of
the RS-485 adapters in between them. This will give me confidence that
everything is working properly and can then move on to communicating with
the yaskawa encoders.
I'm not sure exactly how to wire the adapters and I haven't gotten lucky
yet with my attempts.
Does anyone have a diagram or information on how to use these adaptors?
Do I even have the correct approach here?
Thanks,
Curtis
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