... dispense with steeling electricity of serial port, high adaptability.>Single or ... optic to RS485,single fiber, FC port, 2km1310/1550FC2BT-MS2F-2A/BMultimode optic to RS232, single fiber, FC port, 2kmBT-MS542F-20A/BMultimode optic to RS/485/422/232, single fiber ... optic to RS485, dual fiber, SC port, 60kmSC60BT-SS542F-100A/BSingle mode optic to RS485/422/232, single fiber, FC port, 100kmFC100 Fiber Modem ...