Black Box SHM-FSK Manual de usuario

Protects data against

crosstalk and outside

noise interference.

Point-to-point or

multipoint operation,

full- or half-duplex.

Rates up to 9600 bps.

Uses Fre uency Shift

Keying modulation.

Provides highly

reliable, continuous

data transmission.

Optional modules

available for 2-wire

RS-485 and 4-wire

RS-422.

he Short-Haul Modem-FSK

is a private-line modem that

supports 9600-bps half- and full-

duplex RS-2 2 operation over a

single dedicated wire pair and

across sliding contacts. The

modem uses pure Frequency Shift

Keying (FSK) modulation at high

carrier frequencies (100 kHz,

106.5 kHz to 150 kHz, 156.5 kHz).

These high frequencies make the

modem particularly immune to

crosstalk and outside noise

interference, so you get highly

reliable, continuous data

transmission over distances of

several miles in harsh industrial

environments.

Extend communications over a single pair—

even in the noisiest environments!

KeyFeatures

SHORT-HAULMODEM-FSK(SHM-FSK)

The modem operates in point-

to-point or multipoint applications.

For multipoint applications, the

modem can be operated with

one master unit and up to eight

remote units.

The master unit (ME840A-M)

transmits at 106.5/100 kHz

(Space/Mark) and receives at

156.5/150 kHz.

The remote slave unit

(ME840A-S) transmits at 156.5/

150 kHz and receives at 106.5/

100 kHz.

Since RS-485 interfaces are

common in industrial applications,

we also offer a 2-wire RS-485

module (MD 17) and a 4-wire

RS-422 module (MD 18). Simply

plug the module into the modem’s

RS-2 2 connector and you’ve got

your extra connection.

The modem has several

diagnostic LEDs: Carrier Detect,

Receive Data, Transmit Data,

Loopback, and Power.

The modem interface is

DTE/DCE jumper selectable, so

it’s easy to configure to suit your

application. The default configur-

ation for the Modem is DCE. To

change this configuration, just

move the jumpers on blocks P1

and P2 (located directly behind

the DB25 RS-2 2 connector on the

rear panel).

The modem also includes

jumpers for cofiguring carrier

detect, chassis ground, receiver

gain, and transmit power.

Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: [email protected]

Black Box Corporation.

11/21/200 #18966

Data Format:

RS-2 2C (RS-485 2-wire with

optional MD 17 module, RS-422

4-wire with optional MD 18

module)

Distance (Maximum): 48,000 ft.

(146 0.4 m) on single twisted pair

Operation: Full-duplex or half-

duplex controlled carrier, serial

asynchronous data

Mode: Point-to-point or multipoint

with RS-2 2

Modulation: Frequency shift keying

(FSK); carrier signal inductively

and capacitively isolated

Speed (Maximum): 9600 bps

Interface: DTE/DCE jumper

selectable

Connectors: (1) DB25 F for RS-2 2C

(RS-422 and RS-485 modules),

(1) 2-position terminal block for

carrier, (1) 2-position terminal

block for power

Operating Temperature:

2 to 140°F (0 to 60°C)

Power: 120 VAC, 60/50 Hz @

9.6 watts or 24 VDC at 10 watts

Si e: 1.75"H (1U) x 7.5"W x 10.5"D

(4.4 x 19.1 x 26.7 cm)

Weight: 4.5 lb. (2 kg)

Specifications

Ordering Information

ITEM CODE

Short-Haul Modem-FSK (SHM-FSK)

Master.................................................................ME840A-M

Slave......................................................................ME840A-S

Optional Modules

2-Wire RS-485..........................................................MD 17

4-Wire RS-422 .........................................................MD 18

Recogni e any of these

situations?

• You wait more than 0

minutes to get through to a

vendor’s tech support.

• The so-called “tech” can’t

help you or gives you the

wrong answer.

• You don’t have a purchase

order number and the tech

refuses to help you.

• It’s 9 p.m. and you need help,

but your vendor’s tech

support line is closed.

According to a survey by Data

Communications magazine, 90%

of network managers surveyed

say that getting the technical

support they need is extremely

important when choosing a

vendor. But even though network

managers pay anywhere from 10

to 20% of their overall purchase

price for a basic service and

support contract, the technical

support and service they receive

falls short of their expectations—

and certainly isn’t worth what

they paid.

At Black Box, we guarantee

the best value and the best

support. You can even consult

our Technical Support Experts

before you buy if you need help

selecting just the right component

for your application.

Don’t waste time and

money—call Black Box today.

WhyBuyFromBlackBox?ExceptionalValue.ExceptionalTechSupport.Period.

he SHM-FSK performs data

communication by converting

digital signals to modulated high-

frequency sine-wave carrier

signals. These converted signals

can be transmitted across much

longer distances with greater

noise immunity on wires than

square-wave digital signals. The

digital space and mark (0 and 1)

are converted in the transmitter

to carrier signals that have two

slightly different frequencies. The

two frequencies are identified by

the receiver and reconverted to

the digital signals.

The ME840A-M and ME840A-

S support RS-2 2 point-to-point

and multipoint communications.

Optional modules support point-

to-point. They send data

synchronously, and they’re

transparent to protocol and to

data rates up to 9600 baud.

TechnicallySpeaking

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