By default, the Arduino is in receive mode. Half duplex means that a device can only receive or transmit at a time. TX Enable Pin – because this is a 2-wire RS485 network, it is only half duplex.Here is the list of options, depending on the number of ports available on your Arduino model: Serial Port – this tells the library which Serial port to use. It’s important to ensure there are no duplicate addresses on the network. The address can be any number between 1 and 247 address 0 is reserved for the master. In other words, it’s how other devices in the network know who is talking.
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