Lnk-277 series is an industrial grade rs-232 / rs-422/ rs-485 to fiber optic converter which converts a standard rs-232 / rs-422 / rs-485 transceiver to a fiber optic link as to extend the serial signal up to 2km on multimode fiber and 80km on single mode fiber. This unit is enclosed in an industrial wall mount compact size rugged steel case. StandardEia /tia rs232, rs-422, rs-485 Fiber connectorSc standard, st/fc optional Fiber distance50/125um mmf: 2km, 62.5/125um mmf: 5km, 9/125 smf:20/40/60/80km Serial connectorRs-232: db9, rs-422, rs-485: phoenix terminal Serial distanceRs232: 15 meters, rs-422, rs-485: 1500 meters Rate0-120kbps Baud rate300 baud to 115, 200 baud Rs-232In, out, gnd Rs-485D+, d-, gnd Rs-422R+, r-, t+, t-, gnd Power supplyDc2.5 5v(9v-48v) Power rate2w Static protection15kv electric static discharge (esd) protection Surge protection1500w/sec surge protection Operation temperature-25°c to +70°c Storage temperature-40°c to +85°c Storage humidity5%~90% non-condescending Dimensions110(l)*104(w)*28(h) mm Weight0.3kg/pcs Standard packaging: carton packaging(support customer logo)