Black Box SHM-NPR Series Manual de usuario

MARCH 1997

ME6100A-F

ME6100A-M

ME6101A-F

ME6101A-M

ME6102A-F

ME6102A-M

Async SHM-NPR

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]

Async

SHM-NPR

ASYNC SHM-NPR

TRADEMARKS

All applied-for and registered trademarks are the property

of their respective owners.

ASYNC SHM-NPR

CONTENTS

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

2. Introduction . . . . . . . . . . . . . . . . . . . . . . . .7

2.1 Description . . . . . . . . . . . . . . . . . . . . .7

2.2 Features . . . . . . . . . . . . . . . . . . . . . . .9

3. Installation . . . . . . . . . . . . . . . . . . . . . . . . .10

ASYNC SHM-NPR

1. Specifications

Transmission Mode — Asynchronous, full or

half duplex

Transmission Line — 4-wire unconditioned

telephone line (two twisted pairs)

Data Rates — Up to 19,200 bps

Transmission Level — -6 dBm

Transmission Controls — DCD (Circuit 109) turns

on after recognizing the receive signal from the

line; CTS (Circuit 106) turns on 1 or 12 msec

(selectable) after the terminal raises RTS

(Circuit 105)

NOTE

To ensure proper operation, the equipment connected to

the SHM-NPR should provide at least one of the following

signals: RTS (Circuit 105) or DTR (Circuit 108.2).

Transmission Range — 2 miles (3.2 km) on 24 AWG

wire at all speeds up to 19,200

ASYNC SHM-NPR

Terminal Interface — EIA RS-232C/CCITT V.24,

integral 25-pin connector, choice of male or

female

Telephone Line Interface — 5-screw (4-wire and

ground) connector block with cable strain relief

inside plastic cover

Temperature — 32 to 122 °F (0 to 50 °C)

Humidity — Up to 95%, non-condensing

Power — None required, uses ultra-low power from

the EIA RS-232/CCITT V.24 data and control

signals

Size — 0.9”H x 2.1”W x 4.3”D (2.2 x 5.3 x 11 cm)

Weight — 3.3 oz. (90 g)

ASYNC SHM-NPR

2. Introduction

2.1 Description

The Async SHM-NPR is used for local data

distribution, connecting full- or half-duplex

asynchronous terminals to computers. A pair

of modems ensures integrity of data transmission,

over unconditioned 4-wire telephone lines, for

distances of up to 2 miles (3.2 km).

The SHM-NPR is a high-speed synchronous

modem operating at 76.8 Kbps. The async-to-sync

conversion is performed by over-sampling, allowing

for asynchronous data transmission at data rates up

to 19,200 bps. This design results in a unit that is

insensitive to polarity of wiring (no need to observe

“+” and “-” on the twisted pairs), and is therefore

simple to install and maintain.

ASYNC SHM-NPR

The SHM-NPR features a DCE/DTE switch. This

allows it to operate as a DTE in order to connect to

another DCE, such as a multiplexor port, without

requiring a cross cable. The carrier can be strapped

for either continuous operation (point-to-point

applications) or for switched operation, controlled

by the RTS signal (multi-point applications). Delay

between RTS and CTS is strap-selectable to 1 or

12 msec.

The low transmit level minimizes crosstalk onto

adjacent circuits within the same cable. Data is

transmitted and received at a balanced impedance,

ensuring excellent immunity to circuit noise.

Additionally, the SHM-NPR is coupled to the

telephone line through isolation transformers

which, in conjunction with electronic circuitry,

protect against AC or DC overvoltages.

Innovative circuitry design allows the SHM-NPR

to operate without connection to the main supply,

by using ultra-low power from the standard EIA

RS-232/ITU V.24 data and control signals. To ensure

proper operation, the equipment connected to the

SHM-NPR should provide at least one of the

following signals: RTS (Circuit 105) or DTR

(Circuit 108.2).

ASYNC SHM-NPR

2.2 Features

• Insensitive to wire polarity

• Asynchronous transmission

• Up to 19,200 bps

• Full- or half-duplex

• Point-to-point or multipoint

• Transmission range of up to 2 miles (3.2 km)

• DCE/DTE switch

• Strain relief for line cable

• Lightning-protected

• No AC power required

• Easy to install

• Compact, lightweight

ASYNC SHM-NPR

3. Installation

Installation of the Async SHM-NPR is simple

and straightforward. Follow these steps:

1. Separate the two parts of the plastic cover by

pressing the marked places on the side, starting

at the cable end.

2. Connect 4-wire telephone line to the screw

terminal block: transmit pair to “XMT” and

receive pair to “RCV.” To connect the cable

shield, a ground is provided.

3. Strap the modem according to the strapping

diagram (Figure 3-1) and the strap-selection

table (Table 3-1).

4. To close the unit, simply press the two halves

of the cover together.

5. Plug the modem directly into the 25-pin

connector of the terminal or computer port,

and fasten with the screws on each side of the

connector.

ASYNC SHM-NPR

Table 3-1. Strap Selection.

Strap/Switch Identity Function Position Factory Setting

DCE/DTE Selects SHM-NPR DCE DCE

interface DTE

Carrier Selects carrier On On

constantly on or

switched by RTS Controlled

RTS/CTS Selects RTS/CTS 1 msec 1 msec

Delay delay 12 msec

Figure 3-1. Strapping Diagram.

CARRIER

RTS/CTS DELAY

1 MS 12 MS

DTE

DCE

DCE/DTE

SWITCH

ON CONTROLLED

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