Black Box SHM-B Plus Async Series Manuel utilisateur

JUNE 2002

ME800A-PLUS

ME800AE-PLUS

Short-Haul Modem B (SHM-B)

Plus Async

CUSTOMER SUPPORT INFORMATION

Order toll-free in the U.S.: Call 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 fax 724-746-0746

Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

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

NORMAL

LOOPBACK

FCC/IC RFI STATEMENTS, TRADEMARKS

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.

It 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 Interference Regulation of Industry Canada.

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

applicables aux appareils numériques de classe A prescrites dans le Règlement sur le

brouillage radioélectrique publié par Industrie Canada.

TRADEMARKS USED IN THIS MANUAL

BLACK BOX and the logo are registered trademarks of Black Box

Corporation.

Any other trademarks mentioned in this manual are acknowledged to be the property of the

trademark owners.

SHM-B PLUS ASYNC

NORMAS OFICIALES MEXICANAS (NOM)

ELECTRICAL SAFETY STATEMENT

INSTRUCCIONES DE SEGURIDAD

1. Todas las instrucciones de seguridad y operación deberán ser leídas antes

de que el aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberán ser guardadas para

referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de

operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo,

cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca,

etc..

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales

que sean recomendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea

recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más

allá a lo descrito en las instrucciones de operación. Todo otro servicio

deberá ser referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera que su posición no

interfiera su uso. La colocación del aparato eléctrico sobre una cama,

sofá, alfombra o superficie similar puede bloquea la ventilación, no se

debe colocar en libreros o gabinetes que impidan el flujo de aire por los

orificios de ventilación.

NOM STATEMENT

10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor

como radiadores, registros de calor, estufas u otros aparatos (incluyendo

amplificadores) que producen calor.

11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del

tipo descrito en el instructivo de operación, o como se indique en el

aparato.

12. Precaución debe ser tomada de tal manera que la tierra fisica y la

polarización del equipo no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no

sean pisados ni pellizcados por objetos colocados sobre o contra ellos,

poniendo particular atención a los contactos y receptáculos donde salen

del aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las

recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las

lineas de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no

sea usado por un largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean

derramados sobre la cubierta u orificios de ventilación.

18. Servicio por personal calificado deberá ser provisto cuando:

A: El cable de poder o el contacto ha sido dañado; u

B: Objectos han caído o líquido ha sido derramado dentro del

aparato; o

C: El aparato ha sido expuesto a la lluvia; o

D: El aparato parece no operar normalmente o muestra un cambio en

su desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

SHM-B PLUS ASYNC

Contents

Chapter Page

1. Specifications .............................................................. 5

2. Introduction ............................................................... 8

3. Installation and Configuration .................................. 9

3.1 Making the Four-Wire Connection .................... 9

3.2 Making the RS-232 Connections ...................... 12

3.3 Setting the DTE/DCE Switch (S1) ................... 13

3.4 Setting the Flow-Control Switch (S3) ............... 15

4. Operation .................................................................. 17

5. Troubleshooting ....................................................... 19

CHAPTER 1: Specifications

1. Specifications

Data Rate and Maximum Distance:

Data Rate (bps) AWG (mm)

24 (0.5) 26 (0.4)

Distance in miles

115,200 0.8 0.7

57,600 1.2 0.8

38,400 1.3 0.9

19,200 1.5 1.2

9600 2 1.5

4800 2.6 2

2400 4 3

1200 4.8 4

NOTE: The above specifications are valid for 24- or 26-AWG unshielded

twisted-pair telephone cable insulated by polyethylene with a

mutual capacitance of 0.083 pF/mile (0.52 pF/km). Shielded

twisted-pair cable will reduce the distance to one-third of the table

value, due to the additional capacitance contributed by the cable’s

shielding. Actual distances may vary depending on your specific

operating equipment and the cable you use.

Protocol: Asynchronous

Operation: 4-wire, full duplex, point-to-point

Line Interface: Balanced current loop; receive lines are

protected through optical isolators rated at 1500 volts

SHM-B PLUS ASYNC

Equipment Interface: TIA/EIA RS-232/ITU V.24

interface with a hardware handshake (selected through

use of an external switch); Data Carrier Detect (DCD)

true (high) indicates operating short-haul modem at the

remote end of the loop; interface is switch-selectable for

DTE/DCE configuration (pins 2 and 3 reversed, pins 4

and 5 reversed with pin 8, pin 6 reversed with pin 20)

Connectors: (1) DB25 female, (1) 4-screw terminal

block, (1) RJ-11 female (6 positions, 6 contacts),

(1) 4-pin mini-DIN female

Diagnostics: Loopbacks provided by a front-panel switch:

Analog loopback on a 4-wire loop and digital loopback

on equipment interface (RS-232)

Indicators: (2) Front-mounted bi-color LEDs indicate

the status of the RS-232 transmitter and receiver: green

indicates a “low” logic level (-3 to -15V), red indicates a

“high” logic level (+3 to +15V)

Temperature Tolerance: 32 to 112°F (0 to 50°C)

Humidity Tolerance: Up to 90% noncondensing

Enclosure: High-impact plastic

CHAPTER 1: Specifications

Power: From external power supply (no more than

16 Vrms is present in unit):

Input (ME800A-PLUS): 115 VAC ±10%, 60 Hz, 5 watts

(12 watts maximum);

Input (ME800AE-PLUS): 230 VAC ±10%, 50/60 Hz;

Output (both models): 17 VAC, 700 mA

Size: 1.3"H x 4"W x 4.2"D (3.3 x 10.2 x 10.7 cm)

Weight: 1.4 lb. (0.6 kg), standalone, including

transformer

SHM-B PLUS ASYNC

2. Introduction

The Short-Haul Modem Model B Plus Async (SHM-B

Plus Async) is a standalone asynchronous full-duplex

4-wire line driver/receiver which allows two TIA/EIA

RS-232 devices to communicate at distances of up to

4.8 miles (7.7 km) or at data rates up to 115.2 kbps.

In addition to the transmitter and receiver circuits, the

SHM-B Plus Async includes RS-232 control-line

interfaces, status-monitor LEDs, and a loopback switch.

The 115-VAC version is product code ME800A-PLUS;

the 230-VAC version is product code ME800AE-PLUS.

The SHM-B Plus Async is designed to operate over a

4-wire metallic circuit. Optimum performance is

obtained with twisted-pair cable (see Chapter 1). Most

types of twisted-pair cable may be used, often with little

or no performance degradation.

The SHM-B Plus Async is designed for maximum

operator safety. There are no voltages greater than

12 VDC or 16 VAC present on the circuit board of the

unit. The Receive lines are protected from potential

ground differences through optical isolators rated at

1500 volts.

CHAPTER 3: Installation and Configuration

3. Installation and Configuration

You can install and configure the SHM-B Plus Async in

three basic steps: making the four-wire connections,

making the RS-232 connection, and setting the switches.

3.1 Making the Four-Wire Connections

Connect a pair of SHM-B Plus Async modems to each

other through either their terminal blocks or their RJ-11

connectors. Figure 3-1 on the next page shows the

location of the terminal block and the RJ-11 jack.

a) TERMINAL BLOCK:

Refer to Figure 3-2 to make the proper connections

between two SHM-B units using the terminal block.

NOTE: Transmit + (TX+) on one modem is wired

to Receive + (RX+) on the other modem; Transmit -

(TX-) is wired to Receive - (RX-).

1. Strip each of the four wires about 1⁄8".

2. Loosen the screw terminals in the terminal block.

Insert the wires into the terminal strip; tighten the

screw terminals.

Ce manuel convient aux modèles suivants

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