These are pretty much impossible to get hold of. This design uses a standard 3x2 Dupont shell and three female pins to break out GND, TXD and RXD to give a standard TTL (5V) serial port for the loadvu script or any other software which communicates over serial. Pinout (viewed from end of connector): GND 1 o o 2 NOC NOC 3 o o 4 NOC TXD 5 o o 6 RXD