Is it possible to define which pins on a 7i92 an encoder uses?
- trainwreck
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21 Oct 2023 03:27 #283413
by trainwreck
Is it possible to define which pins on a 7i92 an encoder uses? was created by trainwreck
Hello everybody, I picked up a cheap ebay MPG and went to wire it in to my system, but realized I don't have the ability to use the pins that encoder 0 exists on. I have attached my hal files, but a short summary below for convenience.
In my .hal file I updated my loadrt statement so that it does have 1 encoder, and mesaflash tells me that encoder 0 is on pins 30, 31, and 32, but those pins are on my G540 and already in use by my limit switches. Is there any way that I can reassign the encoder pins to something like pins 013 and 015 on the 7i75 board?
thanks for any help!
In my .hal file I updated my loadrt statement so that it does have 1 encoder, and mesaflash tells me that encoder 0 is on pins 30, 31, and 32, but those pins are on my G540 and already in use by my limit switches. Is there any way that I can reassign the encoder pins to something like pins 013 and 015 on the 7i75 board?
thanks for any help!
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- tommylight
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21 Oct 2023 06:09 #283425
by tommylight
Replied by tommylight on topic Is it possible to define which pins on a 7i92 an encoder uses?
7i75???
Probably not without flashing new firmware, not sure if there is something ready made for G540 and 7i77 or 7i85 as that should have encoders on the other header, but still the first encoder would remain on the main header sooooo....
Better wait for PCW to answer this before i give you headache !
Probably not without flashing new firmware, not sure if there is something ready made for G540 and 7i77 or 7i85 as that should have encoders on the other header, but still the first encoder would remain on the main header sooooo....
Better wait for PCW to answer this before i give you headache !

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21 Oct 2023 14:27 #283445
by trainwreck
Replied by trainwreck on topic Is it possible to define which pins on a 7i92 an encoder uses?
Is the 7i75 not a good card? It's been working well for me so far although I think I might end up regretting trying to save some money and not just buying the 7i76 from the get-go. I thought I would never need that much IO but here I am having nearly completely filled what I have available...
I'm fine with flashing firmware as long as I can get someone to walk me through how to compile it because I really don't want to brick my 7i92!
I'm fine with flashing firmware as long as I can get someone to walk me through how to compile it because I really don't want to brick my 7i92!
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21 Oct 2023 21:27 #283457
by tommylight
Replied by tommylight on topic Is it possible to define which pins on a 7i92 an encoder uses?
Mesa boards are very, very good, all of them.
I never used 7i75 hence the question mark as i have no clue what it does.
If i can manage, i will have a look later and see if there is something ready for it.
Right now i have 4 of 7i92 in machines, plenty more on machines that are gone to shops being used every day, all day.
I never used 7i75 hence the question mark as i have no clue what it does.
If i can manage, i will have a look later and see if there is something ready for it.
Right now i have 4 of 7i92 in machines, plenty more on machines that are gone to shops being used every day, all day.
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22 Oct 2023 00:40 #283470
by tommylight
Replied by tommylight on topic Is it possible to define which pins on a 7i92 an encoder uses?
From the Mesa website :With protections and terminals, nice, i could have used some of those...
Well i can not see anything usable for you, all included firmwares have encoder 0 on P2, you would need it on P1.
You should wait a bit more ...
The 7I75 is a breakout card for Mesa's 25 pin I/O FPGA cards.
Well i can not see anything usable for you, all included firmwares have encoder 0 on P2, you would need it on P1.
You should wait a bit more ...
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22 Oct 2023 14:00 #283502
by trainwreck
Replied by trainwreck on topic Is it possible to define which pins on a 7i92 an encoder uses?
Thanks Tommy, I'll hang around for others to respond

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22 Oct 2023 19:44 #283529
by PCW
Replied by PCW on topic Is it possible to define which pins on a 7i92 an encoder uses?
For a MPG, you would probably want a INM module, as this supports the
1x mode that gets you one count per detent
Do you have a 7I92 or 7I92T?
1x mode that gets you one count per detent
Do you have a 7I92 or 7I92T?
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22 Oct 2023 21:02 #283536
by trainwreck
Replied by trainwreck on topic Is it possible to define which pins on a 7i92 an encoder uses?
Thanks PCW!
I have the 7i92M (not T, this is a few years old). I don't mind getting a quad signal per detent, I have my hal set up to adjust the scaling by dividing by 4.
I don't know what INM is and google is failing me, could you explain?
I have the 7i92M (not T, this is a few years old). I don't mind getting a quad signal per detent, I have my hal set up to adjust the scaling by dividing by 4.
I don't know what INM is and google is failing me, could you explain?
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22 Oct 2023 22:47 - 22 Oct 2023 22:48 #283540
by PCW
Replied by PCW on topic Is it possible to define which pins on a 7i92 an encoder uses?
INM is the input module and it has up to 4 MPG encoders built in
Its described in the hostmot2 manual page
Also what firmware are you using currently?
Its described in the hostmot2 manual page
Also what firmware are you using currently?
Last edit: 22 Oct 2023 22:48 by PCW.
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22 Oct 2023 23:02 - 22 Oct 2023 23:12 #283542
by trainwreck
Replied by trainwreck on topic Is it possible to define which pins on a 7i92 an encoder uses?
I'm using the firmware you provided for me in
this thread. I'll have a read through the man page.
EDIT: it's interesting that none of the writeups or documentation I could find (other than the man page for hostmot2 as mentioned) actually use the inm module, they always use the raw encoders from the mesa cards. Is there any particular reason for that other than people not being aware of the inm modules?
EDIT: it's interesting that none of the writeups or documentation I could find (other than the man page for hostmot2 as mentioned) actually use the inm module, they always use the raw encoders from the mesa cards. Is there any particular reason for that other than people not being aware of the inm modules?
Last edit: 22 Oct 2023 23:12 by trainwreck.
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