I'm wondering of this might be the right cable

It says null modem but I don't see anything about "keyspan adapter"

Dan


Theater: 565/562v, 519, Analog speakers (NHT & Velodyne) Pioneer LaserDisc, Sony PS3, Comcast Cable
Office: 561, DSP5000.2, NHT rears, Acurus Amp, Technics Turntable, Sony SACD Changer, PC Digital out