Black Box Mini Driver 4W-S Manuale utente

DECEMBER 1998

ME749A-F

ME749A-M

Mini Driver 4W-S

CUSTOMER SUPPORT INFORMATION

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX

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

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

Web site: www.blackbox.com • E-mail: [email protected]

TRADEMARKS

TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are acknowledged to

be the property of the trademark owners.

MINI DRIVER 4W-S

1. Specifications

Transmission Mode — Synchronous, full-duplex

Transmission Line — Unconditioned/unloaded

4-wire (2 twisted pairs),

19 to 26 AWG

Transmission Level — -6 dBm

Transmission Range (miles) —

Speed (bps) Wire Gauge

19 24 26

19,200 3.5 2.5 2

9600 5.5 3.5 2.5

4800 7.5 5 3

2400 8.5 5.5 3.5

1200 11 7.5 5.5

NOTE: Multiply by 1.6 to derive ranges in km.

Baud Rates — 900, 1200, 1800, 2400, 3000,

4800, 7200, 9600, 14,400,

and 19,200 bps

Transmit Timing — Internal

CHAPTER 1: Specifications

Connectors — ME749-F: (1) DB25 female

and (1) 5-screw terminal

block;

ME749-M: (1) DB25 male

and (1) 5- screw terminal

block

Operating Temperature — 32 to 122°F (0 to 50°C)

Humidity Tolerance — Up to 95%, noncondensing

Power Supply — Supplied from the RS-232

interface

Size — 0.9"H x 2.1"W x 4.3"L

(2.2 x 5.3 x 11.0 cm)

Weight — 3.3 oz.(90 g)

MINI DRIVER 4W-S

2. Description

The Mini Driver 4W-S is a synchronous full-duplex,

4-wire short-haul modem with a range of up to eleven

miles. It is small in size, packaged inside a connector

cover. It can handle data rates of 900 to 19,200 bps.

The modems are to be used in pairs, one at each

end of the line.

The Mini Driver 4W-S requires no AC power supply,

batteries, or EIA test voltages. Very low power is derived

from the RS-232 data and control lines. It generates

positive and negative signals in compliance with the

RS-232 standard, even when Transmit Data is constantly

a MARK.

The Mini Driver 4W-S is isolated from the line by

balanced transformers. These transformers, together

with the electronic circuitry, protect the modem against

voltage transients.

The Mini Driver 4W-S’s low transmit level minimizes

crosstalk onto adjacent lines in the same cable. The use

of differential diphase modulation provides immunity

to background noise, eliminates line distortion, and

permits efficient transmission and reception of data.

MINI DRIVER 4W-S

Data is transmitted and received at a balanced imped-

ance which ensures excellent immunity to circuit noise.

The Mini Driver 4W-S is transformer-isolated from the

telephone line to protect against voltage spikes.

A typical installation is shown in Figure 1.

Figure 1. Typical Installation.

Unconditioned

4-Wire

(2 Twisted Pair)

Mini

Driver

4W-S

Mini

Driver

4W-S

Sync Terminal

Sync Host

MINI DRIVER 4W-S

3. Installation

1. Open the unit by pressing in the tabs on the side

of the cover with a small screwdriver.

2. Separate the top half of the case from the bottom

half.

3. Set the baud rate switch to the desired setting as

shown in Table 1. The factory default is 9600 bps.

See Figure 2 for the location of the switch. The

switch settings for the available baud rates are

printed on the underside of the circuit board.

Remove the circuit board from the case to access

this information.

Table 1. Baud Rate Settings

Baud Rate (bps) Switch Setting

900 9

1200 8

1800 7

2400 6

3600 5

4800 4

7200 3

9600 2 (Factory setting)

14,400 1

19,200 0

MINI DRIVER 4W-S

Figure 2. Baud Rate Setting Switch.

4. Connect the twisted-pair cable to the transmit

and receive screw-terminals. See Figure 3.

Figure 3. Installation Diagram.

5. Be sure that the screw locks for the RS-232

connector are in their mounting holes. Align

the top cover with the bottom cover and snap

them together.

MINI DRIVER 4W-S

6. Repeat steps 1 to 4 for the remote Mini Driver 4W-S.

Make sure the local transmit terminals are connected

to the remote receive terminals and that the local

receive terminals are connected to the remote

transmit terminals (see Figure 3).

7. Plug each Mini Driver 4W-S into the computing

device and tighten the screwlocks to prevent the

Mini Driver 4W-S from being disconnected from

the computer.

8. Each Mini Driver 4W-S is now ready for operation.

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

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