Belden 4640FDW.00305 is a single-pair cable for OSDP RS-485 transmission, as well as instrumentation and computer cabling. This exact variant is supplied as an orange 305 m reel, making it suitable for cable runs planned from a continuous reel.
The pair uses 24 AWG (7×32) tinned copper conductors with foam polyethylene insulation. A laminated foil shield and tinned-copper drain wire surround the pair to provide the specified shield construction. The cable has a low-smoke, zero-halogen outer jacket and a nominal overall diameter of 5.10 mm.
Belden rates the cable at 300 V and specifies a nominal characteristic impedance of 120 Ohm. These details identify its electrical and physical construction for OSDP RS-485 and related instrumentation or computer cabling applications.
