... with a multiple interface circuit that can handle RS-232 serial interfaces and multi-mode or single- mode fiber ... signal-mode 20KM, 40KM, 60KMCommunication Standard Accord EIA RS-232standard RS-232 signalIN, OUT, GND Fiber signalIN, OUT Working ... , auto serial band rate testFiber wavelengthMulti-mode 850nm, signal-mode 1310nm Electricity port transmissionRS-232 port 15MOptic port transmission Multi ...