Serial RS232 / RS422 / RS485 to Ethernet Converter Network Module ezTCP CSE-M73A | eBay
GitHub - xanthium-enterprises/ATmega328p-to-PC-RS485-communication-tutorial: Tutorial on interfacing your PC with an ATmega328P microcontroller using RS485 Protocol for Bidirectional Communication.
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Smart ARM SAM SAM D21 USB RS232 RS485 Module Board - Sammy-D21 Plus V1.0
32DI 32-channel Digital Switch Input Button State Information Acquisition Modbus RTU Module RS485 RS232 Industrial Controller
ATSAMD51 ARM Cortex M4F Control Module for IoT, Sensors, Automation – BDMICRO, LLC