SEEED RS 232 Shield


I am trying to interface with and MBED board. My question is where is VCC and GND that the shield is using? Moreover, does the Shield uses 5 or 3.3 Volts? How can I identify PINS 33-38? Where can I get data sheets so I can interface safely?

Thank you in advance

RS232 Shield is compatible with Arch Mbed board, and you don’t need to care about the volta of each other due to the MAX232D chip. By the way, this is the wiki of RS232 shield :

Could you show me more details.