The one in the other direction is probably remote shutdown. Where a UPS is used unattended it is common to have software to force a controlled shutdown after a time limit to protect the battery. ----- Original Message ----- From: James Cameron To: Sent: Saturday, July 22, 2000 1:30 PM Subject: [OT]: Help Wanted, UPS Interface > > The UPS is straight analog; there are no digital components on the > PCB, no crystals, no microcontrollers (sadly), just bog standard > things like LM339's. I suspect therefore that the signalling from the > UPS to the PC is just "online" and "low battery", via modem status > lines. But there's a twist; there is an optocoupler facing the other > direction. I can't figure out what function it has. > > -- > James Cameron mailto:quozl@us.netrek.org http://quozl.netrek.org/ > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics