R
Another communications standard we might consider for control outputs is the X10. Control modules are available from Levition & Radio Shack as well as others. While not suitable for heavy duty industrial control, it is a reasonable option for commercial and residential building automation. It is slow and limited to 256 addresses, but would allow list members to test the LinuxPLC at home. I remember running across several Linux programs to implement the X10 communications, but I don't remember where. If anyone is interested I will attempt to find my references. Ralph