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四口RS-485光纤MODEM
RS-232/485/422单模单纤MODEM
RS-232/485/422单模光纤MODEM(传输距离60KM)
RS-232/485/422光纤MODEM
RS-232/485/422双纤MODEM(内置AC 100-240V电源)
RS-232/485/422双纤MODEM
商业级高性能RS-232无源多模光纤MODEM(传输距离2KM)