Serin and Serout - which pins?

I’m using a basic atom pro 28 and a bot board. Which pins on the bot board correspond to serin and serout?

-Bill

Sorry, I hit “submit” too quickly. When one does a

serin s_in

or

serout s_out

which pins on the bot board are being used ?

The ATOM PRO is pin compatible with the Basic Stamp 2. The TX (serial out) is pin 1 and the RX (serial in) is pin 2.
The pin numbers on this side are not affected by the extra 4 pins, so they stay the same.