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Amazon.com: Isolated RS485 RS232 Expansion HAT Board for Raspberry Pi 4B/3B+/3B/2B/Zero/Zero 2 W/Zero 2 WH,Adopt SC16IS752 UART Expansion Chip,SPI to RS485 and RS232 Up to 921600bps Data Rate : Electronics
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Renkforce RF-4011279 Raspberry Pi® add-on PCB Suitable for (single board PCs) Raspberry Pi® A, B, B+ 1 pc(s) | Conrad.com
![2-Channel Isolated RS232 Expansion HAT for Raspberry Pi, SC16IS752+SP3232 Solution, with Multi Onboard Protection Circuits 2-Channel Isolated RS232 Expansion HAT for Raspberry Pi, SC16IS752+SP3232 Solution, with Multi Onboard Protection Circuits](https://www.waveshare.com/img/devkit/accBoard/2-CH-RS232-HAT/2-CH-RS232-HAT-details-intro.jpg)