The +5V supply line (VCC) of the module is linked to the 5V line of ... only a few external components are needed to build a relay-driver circuit. Yes, there is a chance to realize one simple ...

Simply, it’s an Arduino library for communicating with Modbus slaves over RS232/485 via RTU (remote terminal unit) protocol. In conclusion, the Modbus 2-channel 5V relay module is a very useful device ...