Black Box SHM-B Sync Manual de usuario

DECEMBER 1999

ME801A

ME801A-E

ME801-C

Short-Haul Modem-B Sync

(SHM-B Sync)

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]

SYNC SHORT HAUL MODEM

TD RD

NORMAL

LOOPBACK

FCC/IC RFI STATEMENTS

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 J 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

Any trademarks mentioned in this manual are acknowledged

to be the property of the trademark owners.

SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)

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.

SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)

Contents

Chapter Page

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

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

3. Configuration ........................................................................ 9

4. Installation ........................................................................... 12

4.1 Installing Standalone Units ........................................ 12

4.2 Installing Card Units .................................................. 15

4.3 Initial Testing .............................................................. 18

5. Operation ............................................................................. 19

5.1 Normal Operation and LED Functions .................... 19

5.2 The RS-232 Signals, Flow Control, and

Synchronous Timing ............................................... 20

6. Troubleshooting .................................................................. 24

6.1 Loopback Mode .......................................................... 24

6.2 Common Problems ..................................................... 26

6.3 Calling Black Box ........................................................ 31

6.4 Shipping and Packaging ............................................. 32

Appendix A: Distances, Data Rates, and Cable Specifications .. 33

Appendix B: Block Diagram ........................................................ 34

CHAPTER 1: Specifications

1. Specifications

Compliance — FCC Part 15 Subpart J Class A,

IC Class/classe A

Interfaces — RS-232-C (DCE) to attached local device;

Proprietary balanced 4-wire to line

Protocol — Synchronous

Clock Source — Local internal (each SHM-B Sync unit

independently generates its own clock)

Operation — 4-wire full-duplex

Flow Control — Hardware (RTS and/or DTR), local only

(control signals are not passed across the

4-wire line—see Section 5.2); transparent

to software (X-ON/X-OFF, etc.)

Data Rate — 19,200, 9600, 4800, 2400, 1200, or 600 bps

(user-selectable)

Maximum

Distance — See the table in Appendix A

Loopback — Simultaneous local loopback to attached

RS-232 device and remote loopback to

remote SHM-B Sync (user-controllable)

SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)

User Controls — (1) Front-mounted pushbutton to turn

loopback ON and OFF;

(6) Internal pairs of jumper posts for setting

the data rate;

(3) Internal pairs of jumper posts for setting

CTS delay

Indicators — (2)Front-mounted bicolor LEDs for transmit

status and receive status; these light green

for a “low” logic level (–3 to –25 V) or red

for a “high” logic level (+3 to +25 V)

Connectors — RS-232: (1) Rear-mounted DB25 female;

Line: (1) Internal 4-position screw-terminal

block

Leads/Signals

Supported — RS-232: Transmit Data (TD), Receive Data

(RD), Request to Send (RTS), Clear to

Send (CTS), Data Set Ready (DSR), Signal

Ground (SGND), Carrier Detect (CD),

Transmit Clock (TC), Receive Clock (RC),

and Data Terminal Ready (DTR)—

Pins 1 through 8, 15, 17, and 20

respectively;

Line: TX+, TX–, RX+, and RX–

CHAPTER 1: Specifications

Power — ME801A: From utility-power (mains) outlet

through wallmount transformer:

Input: 108 to 132 VAC, 60 Hz, at ~160 mA

(20 watts);

Output: 17 VAC CT at 700 mA;

ME801A-E: From utility-power (mains) outlet

through desktop transformer:

Input: 198 to 242 VAC, 50 or 60 Hz, at

~90 mA (20 watts);

Output: 17 VAC CT at 700 mA;

ME801-C: 17 VAC CT at 700 mA from rack’s

electrical-power bus

Surge Protection — Internal opto-isolators (effective up to

20 VDC) on transmit and receive lines

Temperature

Tolerance — 32 to 122˚F (0 to 50˚C)

Humidity

Tolerance — Up to 95% noncondensing

Enclosure — ME801A, ME801A-E: High-impact plastic

Size — ME801A, ME801A-E: 1.4"H x 4.3"W x 4.5"D

(3.6 x 10.9 x 11.5 cm);

ME801-C: 4"H x 0.5"W x 4.5"D

(10.2 x 1.3 x 11.5 cm)

Weight — ME801A, ME801A-E: 1.3 lb. (0.6 kg)

including power supply;

ME801-C: ~3 oz. (~85 g)

SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)

2. Introduction

The Short-Haul Modem-B Sync (SHM-B Sync for short)

is a synchronous full-duplex 4-wire line driver and

receiver that makes it possible for two RS-232-C devices

to communicate across distances up to 5 miles (8 km), at

data rates up to 19,200 bps. In addition to its transmitter

and receiver circuits, the SHM-B Sync also features status

LEDs, a loopback switch, and support for RS-232 clock

and control signals.

The SHM-B Sync is designed to operate with 4-wire

cable. See Appendix A for optimum cable specifications

and supported distances/data rates.

The SHM-B Sync is also designed for maximum

operator safety. There are no voltages greater than

12 VDC or 17 VAC present on the unit’s circuit board.

Opto-isolation circuits protect both the transmit and

receive lines against voltage surges (up to 20 VDC) such

as those caused by lightning.

The SHM-B Sync is available in either a 120-VAC

(ME801A) or 220-VAC (ME801A-E) standalone version

or a card version (ME801-C) that will fit in our ME810

or RM007 card chassis.

CHAPTER 3: Configuration

3. Configuration

Before you install a pair of SHM-B Sync units, you

should set their configuration jumpers as necessary.

CAUTION!

If you have the card version, make very sure that the

SHM-B Sync card is not installed in a powered chassis

when you configure it. If you have the standalone version,

make sure that it is unplugged and is disconnected from

any other devices. No voltages greater than 17 VAC are

ever present on the board even when it is powered, but the

possibility of electric shock should always be avoided.

When you handle the SHM-B Sync’s circuit board, take

every reasonable precaution against damaging the board

with static electricity. At the very least, discharge yourself

by touching a fixed metal surface before handling the

board; if possible, stand on an anti-static mat and wear a

grounding strap or anti-static gloves.

There are two sets of jumper posts mounted on the

SHM-B Sync’s circuit board:

• Six pairs of posts are used to set the SHM-B Sync’s

data rate. They’re at the front of the left-hand side

of the board (the ones labeled “DATA-RATE

SELECTION” in Figure 3-1). The six possible data-

rate settings are 600, 1200, 2400, 4800, 9600, and

19,200 bps. The factory-default value is 9600 bps; if

your RS-232 equipment is using one of the other

data rates, set the jumpers in both units accordingly

by moving the jumper to the appropriate pair of

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