RS-232 Expansion Card
The RS-232 Expansion Card is a community-designed expansion card that adds a serial RS-232 port to any Framework laptop. Created by Josip Medved (medo64) and first published in May 2022, the card is based on a Microchip MCP2221 USB-to-UART bridge and a Texas Instruments MAX232 RS-232 transceiver, supporting communication up to 115,200 baud.