Serialtest: RS-232/RS-422/RS-485 Serial Protocol Analyzer Serialtest is the world’s leading serial protocol analyzer. Serialtest has been tried, tested and trusted worldwide for over 20 years in a wide range of industries. Serialtest supports sniffing and debugging Asynchronous RS-232, RS-422, RS-485 serial communications. Serialtest.com~Site InfoWhoisTrace RouteRBL Check