The RACETIME2 can either be connected to the PC using a direct connection to the 15pin, DB15 or through the 4 pole input connection box.

Page 27>28 in the RACETIME2 manual.

The direct connection to the DB15

Ground = 10 <> Pin 5 DB 9
Data transmit = 14 <> Pin 2 DB 9
Data receive = 15 <> Pin 3 DB 9

Pin 10 will also be used for the impulse ground so you need to take care jumping another cable onto the ground pin. Use shrink tubing to isolate it.

Connection to the 6 pin DIN Plug that connects to Serial I/O (display) output on the connection box.

Pin 1 = Data Transmit <> Pin 2 DB9
Pin 5 = Ground <> Pin 5 DB9
Pin 6 = Data Receive <> Pin 3 DB9 (not really needed for TOD transmit to PC)