Rdm6300 rfid, no response

Was playing around with a rdm6300 reader with esphome.
But have issues with it not reacting at all.

To make sure that the reader is working I connected it directly to a USB-UART and can see in Termite that the reader spams the tag-id as long as I have e tag near the antenna. so the reader works.

On esphome there is no signs of life.

Inside common i have WIFI, OTA and API settings

  name: test
  platform: ESP8266
  board: esp12e

<<: !include common/common_ex_logger.yaml

  baud_rate: 0

  rx_pin: GPIO3
  baud_rate: 9600

I use a bare esp12 on a devboard.
The TX pin on the reader is connected to the RX pin on the ESP12

If I have understood the documentation correctly on https://esphome.io/components/binary_sensor/rdm6300.html
I should have received: Found new tag with ID ‘XXXXXXX’

Any ideas?

Got it working!
Switching RX from GPIO3 to GPIO13 made it work.
Think there might be a interference from the dev-board’s USB to UART ic (a Silabs CP2104).