Hi this is my project using digital modbus using rs485 connection to fanless pc.
This is the dasboard gui.DI1,DI2,DI3,DI4 all to respective address as in the manual of modbus configuration of rs485 connection.
As you guys can see,my first address when i let the current flow from external wire it will affect my third address.
This is my modbus and cpu configurations using rs485 connection
Why did the voltage affect with each other in the address of modbus rtu?