Grove Keypad to Linkit One

Hi,

I’m trying to get a keypad working with the linkit one with no success.

Here’s the keypad I’m using:
https://wiki.seeedstudio.com/Grove-12-Channel-Capacitive-Touch-Keypad-ATtiny1616-/

The keypad is using a TX RX connection, which is present on the Linkit One, but I can’t seem to get any input from the keypad when using serial monitor. Any example code will be helpful!