The SIT3485ISO is a capacitive isolated half duplex RS-485 transceiver, and bus port ESD protection capacity of more than 15kV HBM. It is a RS-485 transceiver fully meet the requirements of TIA/EIA-485 standard. The SIT3485ISO includes a driver and a receiver, both of which can be enabled and closed independently. When both are disabled, both the driver and the receiver output are high resistance state. SIT3485ISO has 1/8 load, which allows 256 SIT3485ISO transceivers to be connected to the same communication bus. It can realize error-free data transmission up to 500kbps. The SIT3485ISO has the functions of fail-safe, over temperature protection, current-limiting protection, over-voltage protection, etc.