SF Cable, DB9 Male to RJ45 Modular Adapter (10 Pieces)
Allow the use of low cost flexible UTP instead of bulky RS-232. Screw together hoods with an RS-232 connection on one end and an RJ-45 telephone jack on the other end.  This unit allows you to configure your own specific pinouts. When trying to run a serial connection over a very long distance, it is better to use a ethernet line to do so. It will cut down on signal loss and interference.