Black Box Short-Haul Modem-FSK Bedienungsanleitung

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]

AUGUST 1997

ME840A-M

ME840A-S

MD3317

MD3318

Short-Haul Modem-FSK

RS-485 Modules

SHM-FSK

RxD TxD LPBK PWR

FCC STATEMENT

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.

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.

SHORT HAUL MODEM (SHM-FSK)

TRADEMARKS

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

SHORT HAUL MODEM (SHM-FSK)

CONTENTS

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

2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 Master Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 Remote Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.4 Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5. Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.1 DCE and DTE Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2 Transmitter Output Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.3 Receiver Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.4 Carrier Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.5 Chassis Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.6 Half Duplex Operation/Carrier Control . . . . . . . . . . . . . . . . . . . . . 17

6. LED Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7. General Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.1 Tuned Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.2 Proper Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.3 Loopback Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8. RS-485 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

SHORT HAUL MODEM (SHM-FSK)

1. Specifications

Data Format — RS-232C (RS-422/485 optional)

Operation — Full-duplex or half-duplex controlled carrier,

serial asynchronous data

Mode — Point-to-point or multipoint

Data Transmission Speed — Up to 9600 baud

Modulation — Frequency shift key; carrier signal inductively

and capacitively isolated

Distance — Up to 48,000 feet (9.1 miles or 14.6 km) on single twisted pair

Operating Temperature — 32 to 140 °F (0 to 60 °C)

Enclosure — All-metal enclosure, 16 gauge steel; polyurethane paint

Interface — DTE/DCE jumper selectable; Female DB25 connector for

RS-232C; green two-position pluggable terminal block for carrier; black two-

position pluggable terminal block for power

LED Indicators — Carrier Detect, Receive Data, Transmit Data, Power

Power Requirements — 120 VAC 50/60 Hz at 9.6 watts or 24 VDC at 10 watts

Size — 1.75” H x 7.5” W x 10.5” D (4.45 x 19.1 x 26.7 cm)

Weight — 4.5 lb. (2 kg)

SHORT HAUL MODEM (SHM-FSK)

2. Introduction

The Short Haul Modem (SHM-FSK) is a private-line modem that allows

half- and full-duplex RS-232 data communications at 9600 bps over a single

dedicated wire pair and across sliding contacts. The SHM-FSK operates using

pure Frequency Shift Key (FSK) at high carrier frequencies (100KHz,

106.5KHz to 150KHz, 156.5KHz). These high frequencies make the

SHM-FSK particularly immune to crosstalk and outside noise interference,

providing highly reliable, continuous data transmission over distances

of several miles in harsh industrial environments.

The SHM-FSK converts digital signals to modulated high-frequency sine-

wave carrier signals that can be transmitted much longer distances, with

greater noise immunity, than square-wave digital signals. The digital Space

and Mark (or 0 and 1) are converted in the transmitter to carrier signals

having two slightly different frequencies that are identified by the receiver

and reconverted to the digital signals. The SHM-FSKs are configured as either

Master or Remote units and can be used for either point-to-point or multi-

drop data communications.

The SHM-FSKs send data asynchronously. They are transparent to protocol,

and to data rate from DC to 9600 baud.

The SHM-FSK can be configured as a master unit or as a slave unit.

See page 13 for more information.

2.1 SHM-FSK Master Units (part number ME840A-M)

The SHM-FSK Master unit transmits at 106.5/100 KHz (Space/Mark) and

receives at 156.5/150 KHz. A green pluggable two-position terminal block

at the back of the unit is used for connection to the data line. There is no

polarity to the data-line connection.

2.2 SHM-FSK Remote Units (part number ME840A-S)

The SHM-FSK Remote unit transmits at 156.5/150 KHz and receives at

106.5/100 KHz. It has the same data-line connector as the Master unit.

Both the Master and Remote SHM-FSKs are powered by nominal 24 volts

DC, which is supplied to a black two-position plugabble terminal block (+ on

the left, if you’re facing the pins) on the rear panel. The units are delivered

from the factory with 120VAC to 24DC wall transformers which have a black

plug attached. An external 24VDC supply can also be used to power up the

MDLs. The current draw is 250mA.

SHORT HAUL MODEM (SHM-FSK)

2.3 Operating Mode

The SHM-FSKs can be operated in either point-to-point or multipoint polling

mode.

For multi-drop data communications, the SHM-FSK can be operated with

one Master and typically up to eight Remote units. The transmitter in each

Remote unit is controlled by the intelligent device it is connected to. The

Master unit’s transmitter remains on all the time. The green two-position

pluggable terminal block at the receptacle marked “LINE” on the back of the

SHM-FSK unit is used with any two-wire cable (does not need to be twisted).

Since the FSK signal is AC, there is no polarity required on any of the data-

line connections.

2.4 Diagrams

Figure 2-1 shows the location of the LEDs on the front of the SHM-FSK.

CD RxD TxD LPBK PWR

Figure 2-1. Location of LEDs on the SHM-FSK.

SHORT HAUL MODEM (SHM-FSK)

Figure 2-2 is a pinout of the RS-232 port.

SECONDARY TRANSMITTED DATA

DCE TRANSMITTER SIGNAL ELEMENT TIMING

SECONDARY RECEIVED DATA

RECEIVER SIGNAL ELEMENT TIMING

LOCAL LOOPBACK

SECONDARY REQUEST TO SEND

DATA TERMINAL READY

SIGNAL QUALITY DETECTOR

RING INDICATOR

DATA SIGNAL RATE SELECTOR

DTE TRANSMITTER SIGNAL ELEMENT TIMING

TEST MODE

PROTECTIVE GROUND

TRANSMITTED DATA

RECEIVED DATA

REQUEST TO SEND

CLEAR TO SEND

DATA SET READY

SIGNAL GROUND / COMMON RETURN

RECEIVED LINE SIGNAL DETECTOR

+ VOLTAGE

- VOLTAGE

SECONDARY RECEIVED LINE SIGNAL INDICATOR

SECONDARY CLEAR TO SEND

SIGNAL

DESTINATION

NUMBER

SIGNAL

DESTINATION

Figure 2-2. Pinout of the RS-232 Port.

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