Machsupport Forum
Third party software and hardware support forums. => Modbus => Topic started by: johnblagg on September 18, 2012, 07:40:05 PM
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Hello to everyone and thanks for all the work you've done
Im totally new to cnc and the hardware and software but I have managed to get enough together to build my first rough draft machine and get modbus working with a arduino and mach 3 but have yet to connect my controllers up to the arduino due to having no clue what pins to use with Shillings modbus sketch I found posted on here.
can anyone help out with which pins I use for these connections?
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I have exactly the same issue. I have a DIY machine and therefore have no "manufacturers specs" of which pins to use. The other issue I also seem to share with you is that I have asked the question (on a support forum) but yeah well, you get lots of views but no support?
Getting discouraged >:( >:(
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Found this on the CNC zone forum
two arduino modbus threads at the Machsupport forum
Maybe other place to look?
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Thanx been there too, that post is ref back to where we are now, Machsupport and the two threads they refer to there also don't have much....
But I have studied the PDF that the author of the Modbus pde file for the arduino and Mach typed, and it seems that (perhaps I am getting close to understanding it better) one has to have the register tables and reference sheets printed out and have them next to the laptop/PC when within a brain as it seems that specific kind of in-outputs and functions have specific addresses in Modbus and is seemingly also restricted to specific registers. So perhaps having these next to the PC it might be easier to write a brain that will be functional.
All I need to do now is to write a couple of small test brains and see if I can get some reaction from any of the features on my machine.