... RS485 Data 3 Levels Lightning Proof, Dual Power Input, 32CH Video Digital Video Optical Transceiver 19" 2U Cabinet, Support Max. 80CH 232/485/ ... a transmitter, a receiver and related accessories. Pls note following: 2, Power adaptors included in quotation, 220V AC default. Pls ... : 2KM / 20KM / 40KM / 80KM/ 100KM. Default distance is 20KM;5, All equipments, if no special note, are 10bit, 20KM distance ...