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Product Description
The Model 276A provides the capability of transmitting an RS-485 signal
via a fiber optic link. For applications where the transmission medium
must be protected from electrical interference, lightning, atmospheric
conditions or chemical corrosion fiber optics is the perfect solution.
The Model 276A RS-485 to Fiber Optic Converter accepts half-duplex data
rates to 1 MBPS. The RS-485 electrical interface is a balanced,
half-duplex, digital interface which is implemented in a female DB-25
connector. In an RS-485 network the control of data flow is determined
by the designer. In order to provide the greatest versatility the Model
276A enables the RS-485 transmitter when data is detected at the fiber
optic receiver. The fiber optic ports are implemented using the industry
standard ST connectors. Mating cables should be 62.5/125 micron fiber
cable. The optical signal wavelength is approximately 850nm. The optical
power budget for the Model 276A is 12dB. A pair of Model 276A's will
provide reliable communications over fiber where the loss is limited to
12 dB. This translates to distances of at least 2 km (6,600 ft). Power
to operate the Model 276A is supplied by a small, wall-mounted
transformer and line cord.
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