Best RS232 Serial Adapter Cable to Bare End, DB15, Shielded, Molded Plug (Male) or Plug (Female) with Bare Wires, Length to Choose From: 1.5m, 3.5m or 4.6m; Each cable is a separate color for easy identification and they are labeled with the pin to which they are connected. Those with DB9, DB15, and DB25 connections are RS-232, so they transmit data between computers and equipment. The knurled screws on these connectors have slots so they can be tightened with a screwdriver in tight spaces.