Modbus - Wikipedia
https://en.wikipedia.org/wiki/Modbus
Modbus is a data communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs).
The Modbus Organization
https://modbus.org/
Modbus Organization Replaces Master-Slave with Client-Server The Modbus Organization Board of Fieldbus International releases WirelessHART adapter with Modbus RTU interface: the T910.
All about Modbus RTU protocol: advanced Modbus RTU...
https://www.virtual-serial-port.org/articles/modbus-rtu-guide/
How to test Modbus RTU protocol with Modbus RTU monitoring software. The Modbus RTU protocol is a means of communication that allows data exchange between programmable logic...