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  • Also see “text a cell number if my dsc pc1550 home security system alarms” and “dsc keybus protocol” and “dsc keybus talk” Commented Mar 7, 2016 at 16:49
  • Wow! Following one link, to another via the comments led me to [link]github.com/dougkpowers/pc1550-interface which makes me feel even more hopeful! I might be able to skip hacking, and move directly to Interfacing! The article didn't really state whether I should connect the wires directly, or use resistors. I'm assuming that the 13.3v is regulated by the arduino, but I'm not sure about the clock and data pins? - thanks @jwpat7 Commented Mar 8, 2016 at 12:58
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    @RobertCole The Arduino I/O pins can take only up to 20mA of current, and a MAXIMUM of 5.5v. But that is not normal operating condition. That is assuming you are using an Arduino Uno, but otherwise the ratings don't change much. Anyway, a simple woltage divider can solve your problem Commented Sep 5, 2016 at 22:24