I will always mark the modbus terminal as a,b. But unfortunately here i have to use different identification except a, b (example: The 150 mhz cpu module contains 2 mb of sram, 64 mb sdram and 16 mb of flash memory.
Full Duplex Rs 485 Wiring Diagram Wiring Diagram Manual
Modbus rtu in darwin thermometers, thermostats and electronic controllers. Important user information because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each Two conductors are used to carry the rs485 differential voltage signal. Let us interface the soil npk sensor with the arduino nano board using the max485 modbus module.