Black Box MD940A-F Manual de usuario

June 2015

MD940A-F

MD940A-M

Part Numbers

Fiber Driver - ST/DB25F MD940A-F

Fiber Driver - ST/DB25M MD940A-M

FIBER DRIVER

CUSTOMER

SUPPORT

INFORMATION

Order toll- ree in the U.S.: 877-877-BBOX (outside U.S. call 724-746-5500)

FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or ax 724-746-0746

Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: in o@blackbox.com

Speci ications

Power

Wall-mount Power Supply, 100-240 VAC/47-63 Hz nput,

5 VDC, 1.2 Amp Output, UL/CUL

Interface

E A RS-232-C; CC TT V.24, V.28; SO 2110

Flow Control

Will pass XON/XOFF only.

Size

1”H x 2.7”W x 4.2”L

Weight

1.4 lb. includes supply

Data Rate

Transparent to rates up to 76.8 kbps (high/low speed jumper)

Data Format

Asynchronous, Bi-Directional

Connectors

(1) - DB25 female or male, (2) - fiber optic ST

Switches

(1) - DCE/DTE toggle

Fiber Optic Wavelength

850 nm

Receiver Sensitivity

Typical: 3 uW / -25.2 dBm

Transmitter Co pled Power

Actual coupled power varies in fiber optic applications due to mechanical alignment of components and/or

connector and optical fiber tolerances. The Fiber Driver provides a range select feature that allows the user to

compensate for these variations as needed.

Table 1.1 - Transmitter Coupled Power Settings (W3)

cable type W3=A (short range)

(uW/dBm)

W3=B (medium range)

(uW/dBm)

W3=C (long range)

(uW/dBm)

multimode

50/125 um

4.0/-24.0 12.0/-19.2 20.0/-17.0

multimode

62.5/125 um

10.0/-20.0 28.0/-15.5 46.0/-13.4

Multimode

100/140 um

24.0/-16.2 72.0/-11.4 120/-9.2

(NOTE: Set jumper W3 to the lowest power setting for your application to avoid saturating the far-end unit’s

receiver.)

Example Power B dget and Distance Calc lations

Power Budget = Transmitter Output - Receiver Sensitivity

Distance = Power Budget ÷ Loss/km

Example:

Receiver Sensitivity = -25.2 dBm

Transmitter Output = -13.4 dBm

Fiber cable Loss/km = 3.5 dB/km

Power Budget = 11.8 dB

Distance = 3.4 km

Introduction

The Fiber Driver converts standard RS-232 signals into fiber optic signals, which can then be transmitted over

several kilometers depending on cable type and power setting. These devices support asynchronous, bi-directional

RS-232 data transmission. They are switch selectable for either DTE or DCE applications, eliminating the need for

special cables and preventing confusion during installation. They can be ordered with male or female DB25

connectors for the RS-232 interface. Two units are connected using 50, 62.5, or 100 micron multi-mode fiber optic

cable with ST style connectors.

Installation

Before you begin, make sure all equipment is powered off, including the Fiber Drivers.

Remove the two screws and lift off the cover to access the internal configuration jumpers on the Fiber Driver. Set

jumpers W1, W2, and W3 as appropriate for your application (see Figure 3.1 and Table 3.1). Reinstall the cover, and

then set toggle switch S1 for either DTE to connect to a PC, or DCE to connect to a modem. Connect the two fiber

drivers using multi-mode fiber optic cables with ST style connectors. Make certain that the transmitter output of

each unit is connected to the receiver input of the other unit. Next, connect the Fiber Drivers to your RS232 devices,

either by attaching the Fiber Drivers directly to the RS232 connector on your devices, or using straight through

cables. Power up the Fiber Drivers, and then apply power to your equipment.

J mper

F nction

Use

W1 Pull-up to +5 nstall to assert pin 6 on DB25

W2 High speed filter

nstall to operate at rates above

19.2 kbps

W3 Range select* A-short range, B-medium range,

C-long range

*Range selection is dependent upon the core size of the fiber optic cable used and the distance data is to be

transmitted. Select the shortest range that accurately passes data.

Table 3.2 - RS232 Connector (J1)

Pin - Signal

S1 set to DCE

S1 set to DTE

2 - Transmitted Data

Output

nput

3 - Received Data

nput

Output

4 - Request To Send

connected to pin 5

5 - Clear To Send

connected to pin 4

6 - Data Set Ready

(note 1)

Pulled High

7 - Common

Ground

8 - Data Carrier Detect

connected to pin 20

20 - Data Terminal

Ready

connected to pin 8

22 - Ring ndicator

Open

DCE - Data Carrier Equipment

DTE - Data Terminal Equipment

Set toggle switch S1 for either DTE to connect to a PC, or DCE to connect to a modem.

Note:

1. Pin 6 (DSR) is pulled to +5 volts through jumper W1. Please see Table 3.1 for details.

Troubleshooting

f the Fiber Drivers fail to operate check the following before calling for technical support.

1. Are both units powered on? Check to see if the power supplies are plugged into a working AC outlet.

2. Check to see if the inter-connect fiber optic cable is connected properly; transmitter to receiver.

3. Check to see if the DCE/DTE setting is appropriate for the interfacing equipment.

4. Check transmitter power settings.

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used properly, that

is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. t has

been tested and found to comply with the limits for a Class A computing device in accordance with the

specifications in Subpart B of Part 15 of FCC rules, which are designed to provide reasonable protection against

such interference when the equipment is operated in a commercial environment. Operation of this equipment in a

residential area is likely to cause interference, in which case the user at his own expense will be required to take

whatever measures may be necessary to correct the interference.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s

authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in

the Radio nterference Regulation of ndustry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils

numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par le ndustrie

Canada.

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746

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