It has no interface card. It is connected directly to this J5 connector on the main and only board of a small Chinese time clock. If we follow the tracks we will see that there are 10 wires. And I have the BR8223 datasheet but what's the use of discovering only the RX TX wires? Without knowing which commands this reader obeys, it would be little progress. I guess.
still to expensive?
https://de.aliexpress.com/item/32834946780.htm
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