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Modbus subset RTU commands for 2 & 4 channel RS485 Relay PLC Controller UART Serial port Switch
Minimum modbus subset for working with less-than-$10 modbus relay modules now available on eBay. (search product listings for "modbus", sort by price+shipping=lowest to higest)
##Using the node red module:
Select or create a new configuration node:
Edit the module's configuration node to specify serial port and either RTU or ASCII (RTU currently supported).
This project uses the following node npm packages: Modbus-serial, serialport