1. Interface characteristic: compatible the standards of RS-232C and RS485/RS-422 issued by EIA/TIA.2. Electric interface: DB9 female connector for RS-232 interface input end, and 10PIN connector for RS-422/RS-485 interface output end.3. Protection grade: +/-15KV ESD protection for RS-232 interface, and 600W surging protection each line for RS-422 and RS-485 interfaces.4.