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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2020-11-21 from rev ebbf146d86c1+.

RS232

Pinout

Rx/Tx RTS/CTS/DTR/DSR

Signal Level converts

MAX 232 is from an RS-232 serial port to signals suitable for use in TTL circuit.

USB to COM chip

PL-2303:

http://www.prolific.com.tw/eng/products.asp?id=59
about/overview
http://www.prolific.com.tw/eng/downloads.asp?ID=23
datasheet download page
http://www.prolific.com.tw/eng/downloads.asp?id=31
driver download page