google "cmbus" On Mon, 22 Mar 2004 Michael.Dillon@radianz.com wrote: I envisage a standard control module with two external serial ports. One serial port is for a daisy-chained serial bus that can allow one control module to talk to other boxen. The other serial port is where the modem connection goes and could probably be designed to take either an RJ11 phone cable or an RJ45 serial terminal cable. The 1U box's power supply has a built-in relay that is switched by the control module. All external switches and indicators go through the control module. --Michael Dillon --matt@snark.net------------------------------------------<darwin>< Flowers on the razor wire/I know you're here/We are few/And far between/I was thinking about her skin/Love is a many splintered thing/Don't be afraid now/Just walk on in. #include <disclaim.h>