I think that would depend on the machine you are placing the cards in.  A SFF 
(Small Form Factor) machine will require a low profile card while a regular 
desktop will take a full size card.

Joe

----- On 11 Jul, 2018, at 13:13, yomin estiven jaramillo munera 
yejm...@gmail.com wrote:

> Hi, Gene. we have decided to use the Mesa 5i25 for our application, in this
> case could you recommended us to use the standard profile or the low
> profile?, so i would like to known, how is the installation process of this
> card in the machine? thanks you.
> 
> El mar., 10 de jul. de 2018 a la(s) 21:53, Gene Heskett (
> ghesk...@shentel.net) escribió:
> 
>> On Tuesday 10 July 2018 20:13:27 yomin estiven jaramillo munera wrote:
>>
>> > Hi guys, I need configure 2 parallel ports  PCI express (
>> > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?WCH) for a application of 6
>> > axis. however I am having some problems with the recognition of
>> > parallel ports in Debian.
>> > Someone knows what can I do with that?
>> > I need that linuxcnc recognizes the 2 ports. but i must do a initial
>> > configuration from terminal.
>> > can you help me?
>>
>> Does this machine have a std pci slot? If it does, a Mesa 5i25 card will
>> give you a pair of parports, independent of the machines own parport,
>> and do it with more i/o bandwidth than you'll get from adding another
>> parport card. I have 2 machines setup with the 5i25, and both work well.
>> A 4 axis G0704, which uses both ports and and a 7x12 lathe that so far
>> is only using one of them.
>>
>> You can use 2 more or less std parport breakout boards, and I highly
>> recommend the SainSmart boards for that as they have no signal
>> distorting opto-isolators in any output. They do isolate the inputs
>> however, which limits the speed of any spindle encoders involved unless
>> the opto is snipped out of the circuit and bypassed in those two inputs.
>> I am an old C.E.T., so thats easy for me to do.
>>
>> I have no clue if Peter (mesanet) has a pci-express version of that card.
>> You might ask, or an old off lease Dell usually has a pair of pci slots,
>> and can be had for less than a 100 dollar bill from places like
>> pcliquidater.com.
>>
>> Another, more pricey way might be to use a 7i90HD and a trio of 7i42TA's,
>> which are required to protect the 3 volt circuitry of the 7i90, which I
>> am running a converted Sheldon 11x36 with, that gives you 72 gpio's and
>> several choices of FPGA configs. So I am doing what needs to be done to
>> run this lathe and still have around 25 gpio's I haven't used. This card
>> can be driven from a parport, or from an SPI, which I am doing from a
>> raspi 3b on that machine.
>>
>> I hope this helps, yomin estiven jaramillo munera, where are you?
>>
>> --
>> Cheers, Gene Heskett
>> --
>> "There are four boxes to be used in defense of liberty:
>>  soap, ballot, jury, and ammo. Please use in that order."
>> -Ed Howdershelt (Author)
>> Genes Web page <http://geneslinuxbox.net:6309/gene>
>>
>>
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