Telebyte Optoverter 276A Reference Manual

Model 276A

Optoverter

Page 1 of 3

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

Reference Manual

0315-0306 Rev. B

Printed 02.04.02

Table of Contents

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.

1.0 General Description

–

d

quipp

d

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)

Page 2 of 3

Size: 3.5" L x 2" W x .875" H

Environment: 0 to 50 deg

, 5 to 95% RH (no condensation)

C

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.

2

14

7

Data Direction

Data I/O
Data I/O +

Signal Groun

DB-25F

3.2 Fiber

The fiber optic end has been optimized for operation with 62.5/125-micron cable and comes
e

ed with ST-type fiber optic connectors.

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

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
to the far-end "T."

4.0 Operation

5.0 Power

p

y

e

o

e

e

p

e

t

p

t

r

r

p

r

p

o

r

y

p

e

a

y

-

Distributed by:

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

Page 3 of 3

If you require assistance, please call Telebyte Customer Service at [phone], fax us at
[phone] or e-mail us at [e-mail]

.

Warrant

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
date it is delivered for use. TELEBYTE's sole obligation under this warranty shall be t
furnish parts and labor for the repair or replacement of products found by TELEBYTE to b
defective in material or workmanship during the warranty period. Warranty repairs will b

erformed at the point of manufacture. Equipment approved for return for warranty servic

shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freigh

repaid, except for non-continental U.S.A. locations. Non-continental deliveries will be sen

COD freight plus import/export charges.

The above warranty is in lieu of all other warranties, expressed or implied, statutory o
otherwise, including any implied warranty of merchantability or fitness for a particula

urpose. TELEBYTE shall not be liable for any damages sustained by reseller or any othe

arty arising from or relating to any equipment failure, including, but not limited t
consequential damages nor shall TELEBYTE have any liability for delays in replacement o
repair of equipment.

Out of warranty equipment may be returned to the Greenlawn, NY customer service facilit

repaid as described above. Return shipping charges will be billed to the customer. Th
repaired unit will have a 90-day warranty. In those cases where "NO TROUBLE" is found,
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
and can be obtained by calling [phone] or 1-[phone], by faxing (631) 385

8184/7060 or by e-mailing us at [e-mail]. 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

®

L-com

45 Beechwood Drive

North Andover,MA 01845

E-mail: [e-mail]

Fax: [phone]

Toll Free:800-343-1455

CONNECTIVITY

www.L-com.com

PRODUCTS