On Tue, 25 Nov 2008, Jon Elson wrote:
> Date: Tue, 25 Nov 2008 11:23:40 -0600
> From: Jon Elson <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Using hostmot2 for 7i43
>
> Eric H. Johnson wrote:
>> The cable is a factory made cable and rings out.
>>
> Same problem with my products. If the cable doesn't say "IEEE 1284
> Compliant" right on the cable jacket, it WON'T WORK!
> Others "ring out" fine, but don't have the twisted pairs internally to
> prevent crosstalk. Even WITH the twisted pairs, the crosstalk is pretty
> bad, without it all the signals turn into a massive jumble.
>
> Jon
For the 7I43 I recommend IDC flat cables. Like you say, normal "printer"
cables may not have enough grounds in the right places to prevent crosstalk.
With flat cables and the conservative 300 nS double edge control signal
filters in the FPGA config we seem to be fine up to 12 feet (thats as long as
I've tried and thats in a electrically clean environment)
The double edge filtering is why the FPGA configs require EPP 1.9
Peter Wallace
Mesa Electronics
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