I recently got a Seeed studio RFID reader, and am on the way to getting started.
One odd request that the datasheet asks for, is to “please cut off the connection between P1 and
UART via a little knife, and solder P1 and I2C together” (Pg. 7) so that its I2C library can be used.
I’m unsure of how to do that exactly; I haven’t seen something like this before.
I attached a screenshot of the section of the datasheet in question, and here is a link to the reader and its datasheet.