This cable assembly provides access to serial channel 4 and the USB interface available at the auxiliary connector of the SSR-1U serial data logger. The serial channel is presented as three pins (transmit, receive, and ground) at 0.100 inch spacing on a miniature circuit board, and the USB channel is presented in a microUSB connector on a miniature circuit board. The USB Enable line (UEN) of the SSR-1U is tied to USB +5V by default (through jumper R1 on the board). UEN is also accessible as a 0.040 inch hole on the circuit board.