Here is detailed Logic Supply tutorial on how to enable the BeagleBone Black to communicate over an RS-485 bus.
The RS-485 standard defines a serial communication protocol that uses differential signalling over a twisted pair of wires as a shared bus to create local networks of up to 32 devices. The natural noise immunity of differential twisted pairs makes RS-485 well suited for spanning much greater physical lengths than other serial protocols like RS-232.
The BeagleBone isn’t capable of generating the differential signals required by RS-485, but there are many RS-485 transceiver ICs available that can convert between RS-485 and TTL serial levels, enabling the BeagleBone to communicate over an RS-485 bus using its built-in UARTs. This example will show how to do so with the Logic Supply serial cape, using its on-board Zywyn ZT3485 half-duplex RS-485 transceiver connected to UART4.
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