Trigger Cable: 2 x DB25 male to 1 x DB37 male. Pins 2-9 of DB25 A to pins 1-8 of DB37 and pins 2-9 of DB25 B to pins 9-16 of DB37. Pin 25 of each DB25 to pin 37 on DB37. Cable suitable for connecting two independent stimulus computers with parallel ports to ActiveTwo trigger input port. Two 15 foot lengths of nine conductor cable – 15 feet between each DB25 and the DB37 connector.