Converts RS-232/422/485 signal: To FC/SC Single-mode fiber with MODEL277SM To ST Multi-mode fiber with MODEL277MM Extends RS-232/422/485 transmission distance: Up to 20 km with Single mode?MODEL277SM Up to 2 km with Multi mode?MODEL277MM Plug & Play Compact size Decreases signal interference Protects against electronic degradation/chemical corrosion Supports baud rate up to 115.2 Kbps Introduction The Model277 Series converter is equipped with a multiple interface circuit that can handle RS-232, or RS-422/485 serial interfaces and multi-mode or single- mode fiber. Model277 converters are used to extend serial transmission distance up to 2 km (multi-mode fiber) or up to 20 km (single- mode fiber). Note that the RS-232 and RS-422/485 interfaces cannot be used on the same Model277 at the same time to convert to fiber. Auto Baud Rate Detection The Model277 Series incorporates a method for automatically detecting the serial signal baud rate by hardware. This is an extremely convenient feature for the user. Even if a device?s baud rate is changed, the signal will still be transmitted through the RS-232 or RS-422/485 to fiber converter without any problem.