HESC-T-005 is a RS-232 photoelectric isolator. It adopts advanced photoelectric isolation technology, protecting RS-232 serial interface devices from hash environment damage, such as ground loop circuit voltage, surge, lightning, ESD, hot-plug and electromagnetic interference, etc. The damage of RS-232 port is related to communication hardware. For example, when device A connects to device B with RS-232 port, if the voltage difference of ground wire between A and B is up to 50V (usually up to 80V), RS-232 port will not work normally. The isolated voltage of RS-232 port will reach 2500 Vrms instantly, together with 500 VDC Continuous peak voltage difference. It also soaks in ESD and electromagnetic interference, so as to protect RS-232 port. The photoelectric isolation technology is fully isolating the electrical devices and ground loop circuit on both sides. It converts the electrical signal to optic signal, then transmits the signal to another side, finally converts it back to electrical signal. This protects the communication device from ground loop circuit and surge interference, which greatly improves the reliability and stability of the communication system.