The CCD-Serial RS-232/485/422 Series Media Converter (Modem) is equipped with a multiple-interface terminal block that can connect RS-232, or RS-485/422 serial devices to multi-mode or single-mode fibre. It is used to extend serial transmission distance by up to 2km (multi-mode fibre) or 20km (single-mode fibre). The CCD-Serial RS-232/485/422 Series incorporates a method for automatically detecting the serial signal baud rate, which is an extremely convenient feature for the user. Even if a device's baud rate changes, the signal will still be transmitted through the RS-232 or RS-485/422 to fibre converter without any problems. The RS-232 and RS-485/422 interfaces cannot be used at the same time to convert to fibre. 8-Point Terminal Block (Phoenix Connector) Auto-Sense Serial Signal Rate Auto-Sense Baud Rate 500Kbps Maximum Rate Multiple Interfaces (RS232/485/422) Supports up to 128 Nodes Asynchronous / Point to Point / Multi-Point Multi-Mode 2km 1310nm / Single-Mode 20km 1310nm Transmission Distance: RS-232 (15m) and RS-485/422 (1200m) 100-240V ~50/60Hz to 12V DC 1A Adapter (2W Consumption) Dimensions: 100mm x 69mm x 22mm 5-Year Warranty This product comes as a pair.