D-line boards should have come with a serial cable & a jumper cables to run the data to the next board. You can run straight off computer serial port or get a usb to serial cable and software. With the Bib,rank & time showing on boards at finish the crowd really gets into it on the finish of the 2nd run as top racers get instant results. 2 boards really make the finish the place to be. When setting up SST Display be carefull to cut the display time of the boards down to 15 seconds or less on the 2nd run because program shows 2nd run for that amount of time then shows combined time and rank for next 15 seconds. With a 30 second interval between racers you can set it for 30 seconds on the 1st run but cut it down to 15 for the 2nd run. Use two usb com ports off your computer, one for timer, one for boards, save a 3rd for out to live-timing. Make sure all com ports are labled 1-10 any higher and Split seceond will not recognize the com port. Don't try to hang the boards to high and get hurt falling off lader coated in ice. Its easy to hang them high today but at o-dark 30 you will be stressed if you have to go high.