* Input Status is sometimes called Discrete Input. * Holding Register or just Register is also used to store values in the slave. * Examples of use: A Coil can be used to drive a lamp or LED. A ...

This sketch is supposed to test Dragino RS485-BL (Modbus master), using an Arduino UNO as a Modbus slave. The Dragino will be configured to read data stored in Arduino variables (an array), when ...