Black Box LD485A-MP User manual

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

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AUGUST 1999

ME836A-R3

ME836C-R3

BC00702

FA520A-R2

RS-232 Asynchronous

Multipoint Line Driver

(LD485A-MP)

LD485A-MP

RX TX RTS CD PWR

NORMAL

DLB

FCC STATEMENT

FEDERAL COMMUNICATIONS COMMISSION

AND

CANADIAN DEPARTMENT OF COMMUNICATIONS

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 the Canadian

Department of Communications.

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 le ministère des Communications du

Canada.

INSTRUCCIONES DE SEGURIDAD

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.

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

INSTRUCCIONES DE SEGURIDAD

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.

RS-232 ASYNCHRONOUS MULTIPOINT LINE DRIVER (LD485A-MP)

TRADEMARKS

All applied-for and registered trademarks are the property of their

respective owners.

RS-232 ASYNCHRONOUS MULTIPOINT LINE DRIVER (LD485A-MP)

CONTENTS

1. Specifications. . . . . . . . . . .............................8

2. Introduction . . . . . . . . . . .............................10

3. Installation . . . . . . . . . ...............................11

3.1 Jumper and Switch Configuration ...................11

3.2 DCE/DTE Configuration...........................17

3.3 Typical Application . ..............................24

Appendix: Pinning ....................................29

RS-232 ASYNCHRONOUS MULTIPOINT LINE DRIVER (LD485A-MP)

1. Specifications

Interface

—(1) asynchronous RS-232 port (DTE/DCE selectable),

(1) asynchronous RS-584 port

Connectors

—(1) DB25S, female RS-232 port, (1) four-wire terminal block

RS-485 port

Pins Supported

—RS-232 port: TD, RD, RTS, CTS, CD, DTR, DSR, SG,

and FG, RS-485 port: TXA, TXB, RXA, RXB

Data Rate

—0 to 64 Kbps, transparent to data

Indicators

—(5) LEDs (TX, RX, RTS, CD, and PWR)

Temperature

—

Operating

: 32 to 122 °F (0 to 50 °C),

Storage

: -4to158°F

(-20 to 70 °C)

Humidity

—0 to 95% relative humidity, non-condensing

Mean Time Between Failures

—Approximately 180,000 hours (ground

benign environment)

Operation

—Point-to-Point or Multipoint, Half or Full Duplex, Transparent

to data, Selectable RTS to CTS delay, DTE or DCE configurable RS-232

port, Normal or loopback operation

Timeout Delay

—1 msec, 100 msec, or 1 sec (for the RS-485 driver enabled

by data feature)

Power

—Wall-mount transformer, 115 VAC, 8.5 watts or 230 VAC, 8.5

watts

Size

—Standalone unit: 1.8”H x 5.5”W x 8.5”D (4.5 x 13.9 x 21.5 cm),

Rackmount card: 4.7”H x 7.4”L (11.9 x 18.8 cm)

Weight

—Standalone unit (unit only): 1 lb. (454 g), Power supply only:

0.5 lb. (227 g)

RS-232 ASYNCHRONOUS MULTIPOINT LINE DRIVER (LD485A-MP)

Typical Speed Versus Distance

—(4-wire point-to-point 26 AWG twisted

pair)

Speed Distance

1,200 bps 4.0 miles

2,400 bps 3.0 miles

4,800 bps 2.3 miles

9,600 bps 1.7 miles

19,200 bps 1.2 miles

38,400 bps 0.9 miles

64,000 bps 0.75 miles

NOTE

Speed and distances will depend on actual operating conditions.

RS-232 ASYNCHRONOUS MULTIPOINT LINE DRIVER (LD485A-MP)

2. Introduction

The LD485A-MP Line Driver is an RS-232 to RS-485 interface converter

that operates in much the same way as a modem. It allows an RS-232

device to transmit data over much longer distances than is normally

possible (up to 4 miles at 1200 bps). The advantage of the LD485A-MP

over other line drivers and modems is that it can also operate in multipoint

applications. Depending on the operating environment, as many as 64

devices can be linked together using twisted-pair cable.

The LD485A-MP can be jumpered for a user-selectable port timeout.

After the last character is sent from one of the ports and a specified period

of time passes (1 msec, 100 msec, or 1 second), the LD485A-MP disables any

transmission from that port. This timeout would be used in a multipoint

application to prevent one port from monopolizing the line. For example,

if one line driver was still enabled and no data was being sent, the other line

drivers would not be able to transmit or receive data until the one driver

was disabled. Thus, the line would be tied up, with no useful data

communication taking place. The port timeout feature keeps the line free

by disabling inactive ports.

Additional features include a manual loopback test to check the system

wiring for both the RS-232 and RS-485 interfaces, and transient protection

on the RS-485 interface to help prevent damage due to voltage transients

on the data line.

Although designed specifically to connect to other LD485A-MP line

drivers, the RS-485 port may be connected to any device with an RS-422 or

RS-485 interface. This would be useful in an industrial application, for

example, where RS-485 and RS-422 devices would be connected to the

same LD485A-MP.

The LD485A-MP is available in standalone and rackmount versions. The

rackmount card (part number ME836C-R3) is designed to be installed in

the multi-function rack (part number RM700).

A cable and adapter are included with each Driver.

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