You do not need an UPS for that. The way you described it, you would end up with some 50% efficiency or even less.Quote:
Originally Posted by agentofchange
A simple microcontroller with one input line and RS232 port will do the job. They can be easily programmed in C and the program should not take more than 20 lines. Just watch the input pin and send a word/sequence of bytes over the RS232 when the pin goes high (or low). On the Mac side another simple program would listen on the serial port for a pre-defined word and perform "shutdown now" when it receives it. I used to do this back in 2002 in the first version of my install and it worked without any problems.