Siemens S7200 communicating with radio's

I am new to Siemens but I have an s7 cpu226 as a main station with a churchill microlink radio which is receiving information from 2 other microlinks each stationed at a borehole with an s7 cpu224. The 2 radios are sending information from the 2 boreholes and the microlink at the main station is receiving. To be clear what we are trying to achieve is that the s7 cpu226 is able to retrieve the data from the 2 s7 cpu224's.

How do I turn on my I/O or registers to send to the radio's etc. I am lost. I know exactly what I want to do but have a little trouble doing it.

Any help would be great, thanks