Black Box ME800A-R2 Bedienungsanleitung

AUGUST 2000

ME800A

ME800A-R2

ME805-C

ME805-C-R2

ME810

Short-Haul Modem B

(SHM-B 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]

ASYNC SHORT HAUL MODEM

TD RD

NORMAL

LOOPBACK

SHM-B ASYNC

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.

SHM-B 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.

SHM-B ASYNC

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 ASYNC

TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are

acknowledged to be the property of the trademark

owners.

SHM-B ASYNC

1. Specifications

Transmission —

Data Rate (bps) Distance (miles/km)

19,200 1/1.6

9600 2/3.2

4800 3/4.8

2400 4/6.4

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 µf/mile. 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

Equipment Interface — EIA-232/CCITT V.24 interface

with a hardware handshake (selected through use of an

internal strap). Carrier Detect (CD) true (high)

indicates operating short-haul modem at the remote

SHM-B ASYNC

end of the loop. Interface is switch-selectable for

DTE/DCE configuration (pins 2 and 3 are reversed)

Connectors — (1) DB25 female, (1) 5-screw terminal

block

Diagnostics — Loopbacks provided by a front-panel

switch: Analog loopback on a 4-wire loop and digital

loopback on equipment interface (EIA-232)

Status Indication — Two bi-color LEDs indicate the

status of the transmitter and receiver. A green light

indicates a “low” logic level (-3 to -25V) on the EIA-232

interface; a red light indicates a “high” logic level (+3 to

+25V).

Operating Temperature — 32 to 112°F (0 to 50°C)

Humidity — 95%maximum, noncondensing

Enclosure — Standalone: High-impact plastic;

Rackmount: Aluminum alloy

Power — Power is supplied by a wall-mounted power

transformer. No more than 16 Vrms is present in unit.

SHM-B ASYNC

Primary: 115 VAC ±10%, 60 Hz, 5 watts (12 watts max.);

Primary: 230 VAC ±10%, 50/60 Hz; Secondary: 17 VAC,

700 mA

Size — Standalone: 1.4"H x 4.25"W x 4.5"D (3.8 x 10.9 x

11.7 cm); Rackmount: 5.25"H x 17"W x 9"D (13 x 43 x

23 cm)

Weight — Standalone: 1.3 lb. (0.6 kg), including

transformer; Rackmount: 3.7 lb. (1.7 kg), including

transformer

SHM-B ASYNC

2. Introduction

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

is an asynchronous full-duplex 4-wire line

driver/receiver which allows two EIA-232 devices to

communicate at distances of up to 4 miles and at data

speeds of up to 19,200 bps. In addition to the

transmitter and receiver circuits, the SHM-B Async

includes EIA-232 control line interfaces, status monitor

LEDs, and a loopback switch. The SHM-B is available in

both a standalone version (ME800A) and a rackmount

version (ME805-C). Models ME800A-R2 and ME805-C-

R2 include cables.

The SHM-B is designed to operate over a 4-wire metallic

circuit. Optimum performance is obtained with twisted-

pair cable (see specifications). Most types of twisted-pair

cable may be used, often with little or no performance

degradation.

The SHM-B 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.

SHM-B ASYNC

3. Installation

Installation involves three basic steps: four-wire

connections; EIA-232 connection; switch settings.

3.1 Four-Wire Connections

Figure 1 shows the location of the terminal block on the

circuit board. Refer to Figure 2 to make the proper

connections between two SHM-B units.

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

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

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

connection is optional.

1. If the unit is assembled, separate the top and

bottom panels at the front of the unit.

2. Push the rear connector to force out the front

panel and printed circuit board.

3. Route the four-wire cable through the open hole in

the rear panel of the enclosure.

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

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