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...lays I found in town for $5.00 Cdn. The box to put it in cost more than the relay. There is a bunch of extra defines in the .h file that were needed for the larger project this was part of. Just ignore them, they won't hurt. Call this program from your dialplan, and voila. Compile with cc -i lpon.c -o lpon /* * lpon.c Lineprinter ON * *** test program only ** * * (c) David Cook, 1994 * * Set signlal lines on serial port to turn on 5vdc * signal. Used for solid-state relay (low current *...

...blow the sink current on the PC port that drives a standard door lock. A commercial door strike is about $100. The program to run the port is childs play. Here is a test prog I used for turning on a power hungry last printer. Change the comments and the sleep time and you're done. /* * lpon Lineprinter ON * *** test program only ** * * (c) David Cook, 1994 * * Set signlal lines on serial port to turn on 5vdc * signal. Used for solid-state relay (low current * draw on RS232C port) to sw...