It is important to make sure that the firmware in the M1 is version 5.2.10 and the firmware in the M1XRFTW is version 1.2.48.
To view the ELK-6030 motion sensor please see these links –
Canada – http://www.absoluteautomation.ca/elk6030wirelessmotionsensor.aspx
USA – http://www.absoluteautomation.com/ek6030-elk-6030-wireless-motion-sensor/