1. U10 FTDI FT232RL USB to TTL chip
2. U12 ZT32433 RS232 Transceiver Driver
3. J4 Mini USB input from PC or Mac
4. P1 Male DB9 RS232 output
5. J14 connect to Raspberry Pi P1 (USB -TTL)
6. R28-R32, Jumper select USB to TTL or USB to RS232
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