M.E.S.S.I Board

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08 Feb 2023 08:30 - 08 Feb 2023 08:36 #264012 by DSS
M.E.S.S.I Board was created by DSS
I am getting ready to do some more bench testing / filming out in the shed with my new M.E.S.S.I Board and thought others may find it interesting.

What is a M.E.S.S.I Board? It is a ” Mesa Electronics Smart Serial Interface ” Board. It provides us with a means to connect a Mesa Smart Serial board to the 7I92. Not only that; it can also be used to add more Smart Serial connections to boards that already have one when you may need a second as long as you have two free fpga pins. It is 3.3v / 5v tolerant and can be powered by either while sending 5v up to 1.5a to down stream Smart Serial boards. RJ45 led indicators are used for showing when a smart serial board is properly connected ( yellow ) and when the board is communicating with LinuxCNC ( flashing green )





Last edit: 08 Feb 2023 08:36 by DSS.
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08 Feb 2023 12:37 #264034 by tommylight
Replied by tommylight on topic M.E.S.S.I Board
Price? Awailability?

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08 Feb 2023 19:07 #264070 by DSS
Replied by DSS on topic M.E.S.S.I Board
Not sure, it was just something I needed in house. If there was enough interest I could definitely look into making a batch or putting together a data package with schematics, gerbers, B.O.M ect. so any one could make their own.
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08 Feb 2023 21:20 #264076 by tommylight
Replied by tommylight on topic M.E.S.S.I Board
Thank you.
I had plenty of issues getting stuff here, now it has become nearly impossible due to some dumb politicians here, our country is removed from every list on the planet.
Nice work, could have used a few three months back.
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09 Feb 2023 03:21 #264094 by cmorley
Replied by cmorley on topic M.E.S.S.I Board
Interested.
Also what is the brand name of the terminal blocks?
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09 Feb 2023 05:57 #264102 by DSS
Replied by DSS on topic M.E.S.S.I Board
The terminal block used on this revision is made by Phoenix Contact P/N 1771062.
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11 Feb 2023 19:55 #264309 by DSS
Replied by DSS on topic M.E.S.S.I Board
A quick video testing the board with my 7i92 and 7i73 so far so good, testing went well.
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13 Apr 2023 19:38 #268989 by DSS
Replied by DSS on topic M.E.S.S.I Board
Back on this while I wait for parts to arrive for my Taig mill encoder build. I have setup a new Github page " here ". I will try to post any relevant designs / code there. Currently I am redoing the board in KiCad V7 in preparation for posting the files, I thought it best to better organize and clean up my work before publishing. 



While I am at it the thought of adding ESD protection crossed my mind. Would this be desired or needed?

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14 Apr 2023 03:32 #268998 by blazini36
Replied by blazini36 on topic M.E.S.S.I Board
Probably gonna want to keep those boards pretty close to the controller since it's single ended in the controller side. I assume those are a differential transmitter and receiver on the RJ45 side

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14 Apr 2023 20:29 - 14 Apr 2023 20:37 #269029 by DSS
Replied by DSS on topic M.E.S.S.I Board
Correct on both accounts, I plan on placing my m.e.s.s.i board directly next to the Mesa 7i92 that provides the RX/TX lines. The differential lines will be connected to my Mesa 7i73 outside of the main electrical enclosure on the other end of a 15-20ft cable bundle near the monitor.

I am using the 7i73 for physical button, lcd dro and encoder inputs. Currently no noise / communication problems during bench testing, however everything is mounted to the same structure with very short cable runs. I also want to keep the m.e.s.s.i board pretty universal for a variety of use cases outside of just the 7i73 so anyone can make and use one to add a smart serial connection.
Last edit: 14 Apr 2023 20:37 by DSS.

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