Bb-electronics FOSTC - Datasheet User Manual download pdf

FOSTC-0812-1/6

www.bb-elec.com [email protected] [email protected]

International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104

European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445

PRODUCT INFORMATION B&B ELECTRONICS

FOSTC

RS-232

RS-422

or RS-485

Device

Duplex

Multimode

Fiber

or System

RS-232

RS-422

or RS-485

Device

or System

SW1:6 = OFF SW1:6 = OFF

Point to Point

FOSTC

RS-232

RS-422

or RS-485

Device

Multimode

Fiber

or System

RS-232

RS-422

or RS-485

Device

or System

FOSTC

RS-232

RS-422

or RS-485

Device

or System

FOSTC

RS-232

RS-422

or RS-485

Device

or System

SW1:6 = ON

Multi-Drop Ring

Model FOSTC

RS-232, 422 or 485 Signals Up To

2.5 Miles with Fiber Optic Modem

Description

Fiber optic cabling has inherent resistance to EMI/RFI and transient immunity, making it ideal for industrial and utility

data communication applications.

The FOSTC was designed to provide the most versatile connection possible between any asynchronous serial

equipment using Fiber Optic cable. The FOSTC can be used for point-to-point communications between serial devices,

or in a multi-drop fiber ring configuration, allowing multiple serial devices to communicate with each other.

It allows any two pieces of asynchronous serial equipment to communicate full or half-duplex over two fibers at typical

distances up to 2.5 miles (4 km). To extend the distance of the fiber link beyond 2.5 miles, use B&B model FOSTDRP

Fiber Optic Repeater.

Features/Applications

Point-to-point or multi-drop ring configuration

RS-232, RS-422, or RS-485 operation

Use as a converter from RS-232 to RS-422/485

RS-422/485 data rates up to 500 kbps

RS-485 Automatic Send Data driver control

Inherent EMI/RFI and transient immunity.

Eliminate ground loops

Extend serial signals up to 2.5 miles

Uses popular ST type fiber connectors

Standard DB25 female (DCE) for serial connections

12VDC powered (separate supply required)

Figure 1: Typical Setups

Fiber Optic Connections

The FOSTC uses a separate LED emitter and photo-detector operating at 820 nm wavelength. Connections to the

emitter and detector are on ST type connectors. Almost any multimode glass fiber size can be used including 50/125

m, 62.5/125 m, 100/140 m, and 200 m. One fiber is required for each connection between a transmitter and

receiver. In a point-to-point configuration, two fibers are required between the two modems, one for data in each

direction. A multi-drop ring configuration requires one fiber between TX and RX around the loop. See Figure 1 for

typical point-to-point and multi-drop configurations.

The most important consideration in planning the fiber optic link is the “power budget” of the fiber modem. This value

represents the amount of loss in dB that can be present in the link between the two modems before the units fail to

perform properly. This value includes line attenuation as well as connector loss. For the FOSTC the typical connector-

1 2 3 4 5 6

Summary of Contents

Page 1 - Model FOSTC

Page 2 - RS-232 Connections

Page 3 - 485 2 Wire Device

Page 4 - FOSTC-0812-4/6

Page 5 - Specifications/Features

Page 6 - DECLARATION OF CONFORMITY

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