Delock isolator 1 x serial RS-232 DB9 female to 1 x serial RS-232 DB9 male 3 kV. RS-232 DB9 female to RS-232 DB9 male. This RS-232 isolator by Delock protects all connected devices such as computers, machines, controllers and measuring devices from electromagnetic and electrostatic discharges as well as from overvoltages. The complete galvanic isolation of the connected devices ensures continuous data transmission even in the event of earth or ground loops. The isolator can be used as a coupling directly between two DB9 connections without an additional power supply.