Telebyte Optoverter 276A User manual

Model 276A
Optoverter
Reference Manual
0315-0306 Rev. B
Printed 02.04.02
Table of Contents
1.0 General Description
2.0 Specifications
3.0 Installation
3.1 RS-485
3.2 Fiber 3
4.0 Operation
5.0 Power
6.0 Help
1.0 General Description
The Model 276A Optoverter is a two-wire RS-485 to Fiber Optic Line Driver/Converter that
can extend the distance of an RS-485 network to 6,600 ft. At the same time it provides the
inherent advantages of transmission over fiber optic cable, immunity to interference, safety,
secure communications, and more.
Pa
g
e 1 of 3

2.0 Specifications
Electrical: Half-duplex RS-485, two-wire
Fiber Interface: Optimized for 62.5/125 micron fiber cable
Wavelength: 850 nm
Speed: 0-1 MHz
Power Budget: 12 dB (with 62.5/125 micron fiber)
Distance: Fiber 2 km (distances can exceed 2 km depending on fiber loss)
RS-485: Per RS-485 specification
Connectors: Fiber (ST), RS-485 (DB-25 Female)
Power: 115 VAC/60 Hz (220 VAC/50 Hz optional)
Size: 3.5" L x 2" W x .875" H
Environment: 0 to 50 deg C, 5 to 95% RH (no condensation)
3.0 Installation
3.1 RS-485
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.
DB-25F Data Direction
2 Data I/O
–
14 Data I/O +
7 Signal Groun
d
3.2 Fiber
The fiber optic end has been optimized for operation with 62.5/125-micron cable and comes
e
q
ui
pp
ed with ST-t
yp
e fiber o
p
tic connectors.
4.0 Operation
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 I/O-" and "Data I/O+" are connected to the two-wire
Pa
g
e 2 of 3
data from the RS-485 equipment. Pin 7 is Logic Ground (if the customer's equipment
requires it). 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" should be connecte
d
to the far-end "T."
In addition, power can be applied to the Model 276A by using Pin 9 on the DB-25 female
connector and Pin 7 as the ground connection. When using this pin, the input voltage should
be +12 VDC.
6.0 Hel

5.0 Power
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 DB-25 female
connector and Pin 7 as the ground connection. When using this pin, the input voltage should
be +12 VDC.
6.0 Hel
p
If you require assistance, please call Telebyte Customer Service at [phone], fax us at
[phone] or e-mail us at [email protected]
.
Warrant
y
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 th
e
date it is delivered for use. TELEBYTE's sole obligation under this warranty shall be t
o
furnish parts and labor for the repair or replacement of products found by TELEBYTE to b
e
defective in material or workmanship during the warranty period. Warranty repairs will b
e
p
erformed at the point of manufacture. Equipment approved for return for warranty servic
e
shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freigh
t
p
repaid, except for non-continental U.S.A. locations. Non-continental deliveries will be sen
t
COD freight plus import/export charges.
The above warranty is in lieu of all other warranties, expressed or implied, statutory o
r
otherwise, including any implied warranty of merchantability or fitness for a particula
r
p
urpose. TELEBYTE shall not be liable for any damages sustained by reseller or any othe
r
p
arty arising from or relating to any equipment failure, including, but not limited t
o
consequential damages nor shall TELEBYTE have any liability for delays in replacement o
r
repair of equipment.
Out of warranty equipment may be returned to the Greenlawn, NY customer service facilit
y
p
repaid as described above. Return shipping charges will be billed to the customer. Th
e
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.
Whether in or out of warranty, a Return Material Authorization (RMA) number is necessar
y
and can be obtained by calling [phone] or 1-[phone], by faxing (631) 385
-
Pa
g
e 3 of 3
8184/7060 or by e-mailing us at [email protected]. You can also visit us on the web
at www.telebyteusa.com/rma.htm. Reference the RMA number on the outside container.
Document No. 0315-0306/Rev. B
Distributed by:
L-com
®
CONNECTIVITY
PRODUCTS
45 Beechwood Drive
North Andover, MA 01845
www.L-com.com
E-mail: [email protected]
Fax: [phone]
Toll Free: 800-343-1455