olemus
avatud sideprotokoll (Modicon, 1979 )
elektroonikaseadmete vaheliseks andmevahetuseks
jadasiini kaudu,
= a protocol that was developed in 1979 to make communication possible between automation devices

ülevaateid
https://www.techopedia.com/definition/4504/modbus

http://www.modbus.org/faq.php

https://en.wikipedia.org/wiki/Modbus

http://www.interlog.com/~speff/usefulinfo/modbus_protocol.pdf

veebisait
https://modbus.org/