BeagleBone Black RS-485 Tutorial #BeagleBoneBlack @TXInstruments @BeagleBoardOrg
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.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.