I'm a certified emissions inspector here in GA and I might be able to help you out. When it says "not ready", it just means the monitors in the computer are not ready. Do you have the OBD2 work around done on your car? Have you reset you're computer(disconnect battery, reset cel, etc.)within the last couple days/weeks? If so, you have to take your car through the drive cycle to get the monitors ready. All makes and models have different drive cycles. I can get the drive cycle for you at work tomm. if you need it. Let me know if you need it.
Danny