I'm interested in how diseqc motor works. I mean how satellite receiver communicates with it etc. Is there some literature explaining this? Which field of electronics is related to this? Maybe digital electronics?
You might want to look at Eutelsat's page on the topic: http://www.eutelsat.com/en/support/technical-support/diseqc.html But put really briefly, the diseqc protocol consists of a 22 kHz tone with at least 600mV amplitude from your set top box or a diseqc 2.0 capable outdoor unit (ODU), such as a Unicable II LNB. Using long and short bursts of 22 kHz you can send binary 1's and 0's to make up a command, such as E0 10 38 FC to select a certain satellite position and polarization from a monoblock LNB (as an example)