Share 'The computer side of things'

I'm happy to be playing with the CYE8 sensor that I finally got wired up, and it's all connected to the I2C/SMBus interface on the linux PC/104 system and merrily blinking the LED when there's motion in front of the sensor. However, even though I've read countless times how the protocol works from a physical standpoint, and I'm looking at the CYE8 documentation for what commands to send to get it…