Arduino Uno Pinout. January 13, 2013 by P ... They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms.

its a rs232 cable w/ a resistor in one end. thats all i know, i dont know which end it needs to be in, or what size of resistor. try checking google about that, they might have more info about ...