per il connettore della presa intendi questo?
http://www.mijnalbum.nl/Foto-GVTUBMCI.jpg
Pin 1 : PMM signal
Pin 2 : +5 Volt
Pin 3 : RX RS232 Serial data input ( TTL levels(0..5Volt) , ATTENTION !!! NOT RS232 levels(+15,-15 .. +3,-3 Volt)
Pin 4 : TX RS232 Serial data output ( TTL levels(0..5Volt) , ATTENTION !!! NOT RS232 levels(+15,-15 .. +3,-3 Volt)
Shield : Ground