Black Box ME1791A-F Manuale utente

JULY 2003

ME1791A-F ME1794A-F

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]

Ultra-Miniature

Asynchronous Short

Range Modems

Description 1

ME1791A-F, ME1794A-F

1. Features

Ultra-miniature asynchronous short range modems:

• Ultra-miniature modems using hybrid technology

• Asynchronous transmission up to 19.2 kbps

• Transmission range up to 21 km (13 miles)

• No AC power required

• 9-pin RS-232/V.24 connector

• Can be used with both STP and UTP

• Compact, lightweight, easy to install.

Versions

The following versions of the modem are available:

• ME1791A-F – modem with female DCE connector and terminal block line

connector

• ME1794A-F – modem with female DCE connector and RJ-45 line connector.

Application

Async

Computer

Asynchronous

Ter mi na l

4-wire

ME1791A-F,

ME1794A-F

ME1791A-F,

ME1794A-F

Figure 1. Typical Application

2. Description

ME1791A-F and ME1794A-F, ultra-miniature asynchronous short range modems,

are used for local data distribution, connecting full duplex asynchronous DTEs to

computers.

The modems ensure integrity of data transmission, using unconditioned 4-wire

dedicated lines at data rates up to 19.2 kbps. It operates over distances up to

21 km (13 miles) depending on wire gauge and data rate (see Table 1).

ME1791A-F, ME1794A-F

2 Description

Table 1. Typical Transmission Ranges

19 AWG 24 AWG 26 AWGData Rate

[kbps] [km] [miles] [km] [miles] [km] [miles]

19.2 14 9 6 4 4 3

9.6 14 9 6 4 5 3

4.8 14 9 7 4 5 3

2.4 16 10 8 5 7 4

1.2 21 13 11 7 8 5

The modems incorporate innovative circuitry design, which enables the units to

operate without connection to the mains supply, by using ultra low power from

the standard RS-232/V.24 data and control signal voltages. The modem operates

fully even if only Transmit Data is connected (i.e. without the DTE sending Request

to Send or Data Terminal Ready signals). Both positive and negative signals are

generated in compliance with RS-232/V.24 standards, regardless of constantly low

or constantly high Transmit Data. Table 2 provides the DCE connector pinout.

Table 2. DCE Connector Pinout

Pin Designation Function

1 DCD Data Carrier Detect (output)

2 RD Receive Data (output)

3 TD Transmit Data (input)

4 DTR Data Terminal Ready (input)

5 GND Ground

6 DSR Data Set Ready (output)

7 RTS Request To Send (input)

8 CTS Clear To Send (output)

9 RI (+V)

The low transmit level minimizes cross-talk onto adjacent circuits within the same

cable. Data is transmitted and received at a balanced impedance, ensuring

excellent immunity to circuit noise.

The line side of the modems offers connection to the RS-232 plug ground.

This may be connected to the shield of the STP wiring to provide end-to-end

ground continuity. Table 3 provides the pinout of the RJ-45 line connector.

ME1791A-F, ME1794A-F

Technical Specifications 3

Table 3. Line Connector Pinout (RJ-45)

Pin Function

1 Not connected

2 Ground

3 RCV-

4 XMT-

5 XMT+

6 RCV+

7 Not connected

8 Not connected

3. Technical Specifications

Line Interface Line Type 4-wire unconditioned dedicated line

(two twisted pairs)

Transmission Mode Asynchronous, full duplex

Transmission Level -6 dBm

Range See Table 1

Connector • ME1791A-F: 4-screw terminal block

• ME1794A-F: RJ-45

DCE Interface Type RS-232/V.24

Data Rate Up to 19.2 kbps

Control Signals DSR (Circuit 107) and DCD (Circuit 109) turn

on immediately after the terminal raises DTR

(Circuit 108.2);

CTS (Circuit 106) turns on immediately after

the DTE raises RTS (Circuit 105)

Connector D-type, 9-pin, female

Power No external power supply is required; the

modems use ultra low power from the

RS-232/V.24 data and control signals

Physical Height 19.8 mm / 0.8 in

Width 31 mm / 1.2 in

Depth 61 mm / 2.4 in

Weight 26g / 0.9 oz

Environment Temperature 0–50°C (32–122°F)

Humidity Up to 90%, non-condensing

ME1791A-F, ME1794A-F

4 Installation

4. Installation

Installation of the modems is simple and straightforward, just follow these steps:

1. Connect the 4-wire dedicated line to the line connector; transmit pair to

‘XMT’ and receive pair to ‘RCV’.

Observe the following pin polarity between the local and remote units:

 Local XMT+ connected to remote RCV+

 Local XMT- connected to remote RCV-

 Local RCV+ connected to remote XMT+

 Local RCV- connected to remote XMT-.

2. Connect the modems directly to the 9-pin connector of the DTE or the

computer and fasten with the two screws – one on each side of the modem

connector.

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