Assign the M1XIN to a new address depending on how many wireless sensors you need to add — for example set the M1XIN from existing Address #2 to Address #6 then connect the M1XRFTWM at address #2 and perform the Bus Module Enrollment. Next you will need to Delete Hardwired Group 2 and recreate those zones starting at Zone 81 (M1XIN Address #6), create Wireless Group 2 and start your Wireless Zones at #17