Lora-E5 channel pairs

Greetings! I am considering Lora-E5 for a project involving industrial communication. As far as i understood from the datasheet (AT commands table 3-7) there are 3 pairs of frequencies available for the EU standarts. So I need to know if I can switch the Lora-E5 between the standarts to generate more of channels if i need to? I suppose only one device can operate on a single channel?!
Can you tell me a little bit more how the module is working and operating within these channels? As far as I understood i need 1 channel for transmition and 1 channel for the incoming data.