connect Serial device to RB 433L

Hello ,
want to know if it is possible to connect a serial to this RB
I can see there is a Rx,Tx,GND where the connector should be
maybe using a RS232-TTL (if necessary)

Thank ,

I would guess that it will not work. Anyway it would just be easier to buy the board already with the serial.

http://routerboard.com/RB433