Best RS232 Serial Adapter Cable to Bare wire End, DB25, Shielded, molded Socket (Female) with Bare Wire Leads, 5 feet length of choice; Each wire lead is a separate color for easy identification and they are labeled with the pin that they are connected to. Those with DB9, DB15, and DB25 connections are RS-232, so they transmit data between computers and equipment. The thumb screws on these connectors have slots so they can be tightened with a screwdriver in tight spaces.