7i80 and 7i77

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16 Dec 2013 00:19 #41629 by sneci
sneci replied the topic: 7i80 and 7i77
Many thanks, I do it...
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17 Dec 2013 06:57 #41660 by uli12us
uli12us replied the topic: 7i80 and 7i77
I have an additional question. Is it possible to connect a differential encoder to the single ended inputs of the 7i76/77 card. Or otherwise to connect the A.B_ and A_.B together on the A and B inputs of the card?
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17 Dec 2013 07:18 #41661 by andypugh
andypugh replied the topic: 7i80 and 7i77

uli12us wrote: I have an additional question. Is it possible to connect a differential encoder to the single ended inputs of the 7i76/77 card. Or otherwise to connect the A.B_ and A_.B together on the A and B inputs of the card?


7i77 encoders are jumper-selectable as single-ended or differential.
The 7i76 has differential encoder inputs that can be configured for single-ended use.
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07 Jan 2014 00:53 #42387 by DaBit
DaBit replied the topic: 7i80 and 7i77

andypugh wrote:

andypugh wrote: I have a 7i80, Let me see if I can make it work. This may take some time.

I have it working behind me. :-)


Do you still have it working, or did you already put the 7i80 back in the closet because it was buggy?
For my new mill I need more I/O, faster step generation and faster encoder counting than the humble parallel port on an Intel D525MW can provide. I also had a D525MW board break and they are becoming hard to get. New, locally sourced hardware is much worse in the latency department than the D525MW.
So I am really considering one of the Mesa cards. If only they were not so close to impossible to obtain I would already have gotten one :(

I would like to avoid the PCI bus if possible. The PCIe solutions are quite expensive. That leaves the 7i43 and 7i80. The 7i80 had more I/O and I really like the Ethernet connection.

I am not afraid of performing the install RT-preempt kernel / compile LinuxCNC / etc. steps mentioned, but will this result in a system that just works when I need to make a part? I do like to tinker, but I also use a mill to, uhm, do some milling from time to time.
Also, I am not really in a hurry. Building a CNC mill from scratch takes a couple of months anyway before the axes move under computer control.
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07 Jan 2014 01:02 #42388 by andypugh
andypugh replied the topic: 7i80 and 7i77

DaBit wrote: Do you still have it working, or did you already put the 7i80 back in the closet because it was buggy?

I didn't find it to be especially buggy, but neither do I have any real job for it, so it went back on the shelf.

I would like to avoid the PCI bus if possible. The PCIe solutions are quite expensive.

That's a pity, because I would have said that the obvious choice is probably either a 5i25 or 6i25 and a suitable daughter board.
The 7i80 is still somewhat experimental, and typically will tie up the ethernet port (not such a problem with an internal WiFi card, I suppose).
Duzi.cz do claim to have a 7i80HD in stock,
www.duzi.cz/shop_cnc/index.php?main_page...h=1_4&products_id=54
I am not sure how good the latency/jitter is with an ethernet connection.
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07 Jan 2014 03:19 #42395 by DaBit
DaBit replied the topic: 7i80 and 7i77
Hmm, I was not aware of the 6i25. Price of that board is quite OK. But of course nobody in Europe stocks it. But I might be able to order directly from Mesa. I don't care much about the standard breakout boards; I do have my own with all the extra functions I want and it is rock solid.

But even then I still like the Ethernet link. Single, small cable from (panel-)PC to control cabinet, galvanically isolated communication. One might have to add a supported Ethernet card, but Intel Pro/1000 cards are affordable and good.
I also cannot imagine much variable latency in a point-to-point 100Mbit full duplex link where only UDP packets are exchanged, but that is only from a hardware point of view. There is a lot of software in between.
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07 Jan 2014 03:27 #42396 by andypugh
andypugh replied the topic: 7i80 and 7i77

DaBit wrote: But I might be able to order directly from Mesa.


Mesa have entered the 20th century and now have a web shop:

store.mesanet.com/index.php?route=produc...e=6i25&product_id=58
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07 Jan 2014 03:31 #42397 by andypugh
andypugh replied the topic: 7i80 and 7i77

andypugh wrote: store.mesanet.com/index.php?route=produc...e=6i25&product_id=58


Postage is a killer though, $52 with USPS and $356 (!!!) with UPS.
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07 Jan 2014 06:43 #42410 by DaBit
DaBit replied the topic: 7i80 and 7i77
Even then it is approximately the same price. 7i80 for example:

duzi.cz: EUR 165.45 plus EUR 23,05 shipping with Czech mail = EUR 188,50.
mesanet webshop: USD 149.00 plus USD 43.75 shipping = USD 192,75 = ~EUR 145. But customs might catch the package and add VAT, import duty, etc., And then total price goes up towards the duzi.cz price.

Cannot compare the 6i25 since duzi.cz does not stock it and the other European distributor's website is offline.
But since duzi.cz is not a serious distributor in my opinion (most cards are 'sold out' for months already) the choice is not that difficult.

Can one use multiple 6i25's in one system if it turns out that i need 8 encoders and 5 step drivers?
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07 Jan 2014 07:07 #42412 by andypugh
andypugh replied the topic: 7i80 and 7i77

DaBit wrote: Can one use multiple 6i25's in one system if it turns out that i need 8 encoders and 5 step drivers?


Yes. In fact you could have as many 6i25s as there are PCIe ports, as many 7i43s as there are parallel ports, as many 7i80s as you can afford routers for. At some point it would all run out of CPU at the PC end.

it might be possible to have 8 encoders and 5 step drivers all on one 6i25 though. A 7i76 + 7i77 config (the 6i25 and 5i25 have two ports, one on a header) has 5 step drivers + a spindle encoder on the 7i76 and then
The 7i77 has several real encoders and also some (onboard) MPG encoders.
I think there are 3 encoders on the (small, cheap) 7i73 board, and you can hang one of those off of the 7i76 (and most of the other DB25 cards) and 8 of them off of the 7i74 board.
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