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What information you need I think your question is to large do you need information about the rs485 or you want to do domitic application with rs485 network give me more info and I will help you. But I think is not the best way to do domitic. Give me more info about your project and I will help you firstname.lastname@example.org
If you want I will sent example microcontroller code for PIC devices
with Hardware UART or Software serial interface. RS485 communication is simple.
Only different is that you must bring up enable pin of the RS485 driver chip during transmit to disable receiver module. That is valid for half-duplex multi-drop transmition
and 2-wire connection. If you want only to expand rs-232 to 1200 meters you do not need
driver with three level state output, and may use 4-wire connection (for example ADM488 Analog Devices). In multi-drop they are some physical characteristics in wire bus, but there is too long to explain.
That is right. Nothing dificult in rs-485.
RS-485 is only physical comunication standart. All other thigs are in software, e.g protocol. Protocol must contain header, message body, checksum and trailer.