... is a RS-232/RS-485/RS-422 serial fiber modem, designed according to industrial standard. The hanging designs ... protection function, because it transmits the optical signal through fiber cable, Features Zero delay automatic transmission; Adopt automatic monitoring ... /120SC/FCExternalDC5V/1AFM280S-S20/40/60-SC/FC10/100Single-fiber single-modeWDM 1310/155025/40/60SC/FCExternalDC5V/1AFM280S-S80 ...