... connector 220V or 48V RS485 Fiber Modem, Dual Fiber Mini Rack Fiber Optical MultiplexerSPD-RS485-D-20-131SRS485 Fiber Modem, Single ... Fiber, 20km, 1310nm, SC/FC connector 220V or 48V, Mini rack RS485 Fiber Modem. We test each piece of RS485 Fiber ...