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|Table of Contents|
|Table of Contents
1.0 General Description
1.0 General Description
The Model 276A Optoverter(, 2 wire RS-485 to Fiber Optic Line Driver/Converter, provides the capability of extending the distance of an RS-485 network to 6600 feet. At the same time it provides the inherent advantages of transmission over fiber optic cable, immunity to interference, safety, secure communications, etc.
2.1 Electrical: Half duplex RS-485, 2 wire
2.2 Fiber Interface: Optimized for 62.5/125 micron fiber cable
2.3 Wavelength: 850nm
2.4 Speed: 0-1.0 MHz
2.5 Power Budget: with 62.5/125 micron fiber 12dB
Fiber - 2Km (distances could exceed 2Km depending on fiber loss.)
RS-485 - per RS-485 specification
2.7 Connectors: Fiber = ST, RS-485 = DB-25 Female
2.8 Power: 115 VAC/60 Hz (220 VAC/50 Hz optional)
2.9 Size: 3.5" L x 2" W x .875" H
2.10 Environment: 0° to 50° C, 5 to 95% RH (no condensation)
The RS-485 connector to the Model 276A allows for half duplex operation through a DB-25 female connector. Refer to the following chart for pin assignments.
The fiber optic port has been optimized for operation with 62.5/125 micron cable and comes equipped with ST type fiber optic connectors for the transmit and receive fibers.
The Model 276A can be connected to any RS-485 device running at speeds up to 1 MHz. To connect the units, the connections 'Data In' are connected to the 2 wire data from the RS-485 equipment and the 'Data Out' provides a signal to the receive data pins of the RS-485 equipment. To connect the 276A to another 276A the fiber connector marked T should be connected to the far end fiber connector marked R, and the local R to the far end T.
The Model 276A is powered by a small DC power adapter that supplies reduced DC voltage. In addition, power can be applied to the Model 276A by using pin 9 on the DB25 female connector and pin 7 as the ground connection. When using this pin, the input voltage should be +12VDC.
If any assistance is required call Bomara Associates at (800)-5BOMARA or (978)-452-2299.
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Document No. 0315-0306
Telebyte warrants the equipment to be free from defects in material and workmanship, under normal and proper use and in its unmodified condition, for 12 months, starting on the date it is delivered for use. TELEBYTE's sole obligation under this warranty shall be to furnish parts and labor for the repair or replacement of products found by TELEBYTE to be defective in material or workmanship during the warranty period. Warranty repairs will be performed at the point of manufacture. Equipment approved for return for warranty service shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freight prepaid, except for non- continental U.S.A. locations. These deliveries will be sent COD freight and import/export charges.
THE ABOVE WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, STATUTORY OR OTHERWISE, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TELEBYTE SHALL NOT BE LIABLE FOR ANY DAMAGES SUSTAINED BY RESELLER OR ANY OTHER PARTY ARISING FROM OR RELATING TO ANY EQUIPMENT FAILURE, INCLUDING, BUT NOT LIMITED TO CONSEQUENTIAL DAMAGES NOR SHALL TELEBYTE HAVE ANY LIABILITY FOR DELAYS IN REPLACEMENT OR REPAIR OF EQUIPMENT.
Out of warranty equipment may be returned to the Greenlawn, NY customer service facility prepaid as described above. Return shipping charges will be billed to the customer. The repaired unit will have a 90 day warranty. In those cases where "NO TROUBLE" is found, a reduced charge will be billed to cover handling, testing and packaging.