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...at interface it uses. The chips inside are just voltage comparators and doesn't seem to have a proper "serial" data interface, it only has a small board containing a pair of opto couplers going to the DB9 plug. You can see pictures of the output board here (onedrive): http://1drv.ms/1A3ryEp http://1drv.ms/1A3ryEp The only pins used seems to be 2, 4 and 5. ?Is it a RUPS interface? ?What cable pinout do I need to build? Thanks!!! -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.alioth.debian.org/pipermail/nut-upsuser/attachments/2015042...