Hi. Is there any standard in how a UPS could be shuted down via RS232 pins? In the APC-PRO, for example, once you short cicuit pin 1 and 2, the UPS shuts down after a beep. When the short is released and the power is back the UPS is turned on... Thanks. Dennis. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist