With Tripp Lite's P450-000 Null Modem Adapter Kit, you can set up PC-PC Serial connections up to 100-ft. (30.5 m) apart using readily available Cat5/Cat6 patch cables. The finished connection results in a Null wiring configuration: 1+6 - 4, 2-3, 3-2, 4 - 1+6, 5-5, 7-8, 8-7, with Full Handshake capability. Slotted, knurled thumbscrews provide easy and secure attachment to your computers. 2pc DB9F to RJ45 Null Modem Adapter Kit Uses readily available Cat5 Patch Cables Null Modem Serial Connections up to 100-ft. (30.5 m)