On Feb 27, 2012, at 5:25 PM, Steve Read wrote: > I spent some time reading and thinking about your email and realized that > normal (AC present, battery normal) is at -12V which is a logic low. > I thought this was how I designed it but when I got funny results I convinced > myself that it was +12V. >
Of course, the mark/space terminology and weird logic levels on TXD/RXD don't help the debugging process. I suppose this would also depend on fixing the ground pin, but if you're writing the microprocessor code yourself (and assuming you have a RS-232 line driver installed on the microprocessor board), one other thing to consider is emulating a "smart UPS". This would allow you to monitor voltages and whatnot. It also provides a more solid handshake between the UPS and the server - if the driver pings the UPS and it doesn't respond, you will get log messages. The Megatec protocol has a simple ASCII query/response structure, and would be fairly easy to implement. http://trac.networkupstools.org/projects/nut/browser/trunk/drivers/blazer.c The "vendor" and "rating" strings can be constant, and the "status" is fixed-width fields - so it should be easy to implement even in assembly. Then again, you might not be as obsessed with graphs and logs as I am :-) -- Charles Lepple clepple@gmail _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsuser
