Hi William and All,
Thanks to all for the offers and clarifications. I may have located
a cable locally and if not will probably make one up per William's
and Phil's instructions.
And as William and others have said - do not use anything as an SWI
cable unless you know it's an original SWI cable or have made up the
cable yourself according to the original SW pin out diagrams.
Thanks again for all the support.
Best,
Jeff
Carl:
I have checked with Xantrex. I would not make a declaration on the
Wrenches forum to my esteemed colleagues unless I was quite certain.
Find the "SWI Stacking Cable wiring diagram" on our web site at:
http://millersolar.com/resources/resources.html under
"Manufacturer's data". This diagram came directly from a Xantrex
engineer. I have no reason to doubt it's authenticity. This is not
the pin out for a "standard" DB25 cable. Not also the link just
below it for "Not an SWI cable" This is your "standard" cable. I
fished this out of my attic this evening and scanned it still in the
package. Note it is listed as a "straight through" cable. This
means pin 1 connects to pin 1, pin 2 to pin 2, etc. This is not the
same wiring as depicted in the SWI stacking cable diagram.
I believe you have suggested twice that solar installers grab the
nearest "standard" DB25 cable and give it a try. I feel compelled
to correct the record publicly. These are not the same cables and
unspecified damage could occur. I know I once shorted out a sync
cable for Heart Interface inverters and blew two of them up
catastrophically two days before Christmas. It was a very
unpleasant surprise for the client (who had guests coming) and for
my self. These cables are a direct link to the FET control circuits
and need to be treated with the utmost caution.
I don't know what would happen to two SW inverters if connected with
your straight through cable, but I recommend strongly against trying
it. Please do not recommend practices unless you are quite certain
they will cause no harm.
Respectfully,
William Miller
PS: Printer cables were never DB25-DB25. They were DB25 to Centronics.
Wm
At 10:01 AM 3/31/2009, you wrote:
William,
I used an off the shelf cable to use with the SW and PS remote,
it was a double male ended 25 pin cable. They were formally used
as printer/computer cables. I believe the stacking cable is the
same style. You could check with Xantrex.
Carl Hansen
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