Black Box ME1240A-F Bedienungsanleitung

Interconnect sync equipment

without a modem.

Interconnect sync equipment

without a modem.

Sync Modem Eliminators—Nonpowered (SME-NPR)

FREE 24-hour Tech Support: 724-746-5500

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FEATURES

• Depending on the model, you can

transmit at speeds up to 19.2, 38.4,

64, or 224 kbps.

• All models emulate switched or

dedicated services and can transmit

in half- or full-duplex operation.

• Enable two RS-232 DTE devices to

exchange sync data without the need

for expensive synchronous modems.

• Easy to install and configure.

• Choose between high-speed and

standard models.

Choose this inexpensive alternative to a pair of sync modems.

OVERVIEW

Sync data transmission meets savings with our Synchronous

Modem Eliminators-Nonpowered (SME-NPR). They enable two

RS-232 DTE devices (terminals, PCs, mainframes, workstations,

etc.) to exchange sync data without the need for expensive

synchronous modems. Choose between high-speed or

standard models.

The RS-232 High-Speed Sync Modem Eliminator-

Nonpowered (ME242A-M) supports six selectable rates, from

7 kbps up to 224 kbps. To emulate switched or dedicated

service, the delay can be set to either 0 or 6.6 ms.

Our standard RS-232 Synchronous Modem Eliminators-

Nonpowered (ME1240A-F) are available with top speeds

of 38.4 kbps.

To emulate switched or dedicated service, the delay

can be set to 0, 6.6, or 53 ms.

The ME900A-M and ME900A-F are similar to the

ME1240A-F, with maximum speeds of 19.2 kbps.

All our Synchronous Modem Eliminators-Nonpowered

(SME-NPR) units derive their power from the RS-232 interface.

The SME-NPRs feature two male or female DB25 connectors.

In addition, these units can transmit in half- or full-duplex

mode.

All models feature tri-state LEDs to monitor receive data,

request to send, and data carrier detect on each side of the

device. The carrier can be configured as “constantly on”

or “controlled by RTS.”

For any questions on these or other BLACK BOX®products,

call our FREE Tech Support.

Synchronous Modem Eliminator—

Nonpowered 38.4 kbps, DB25

Female (ME1240A-F)

Host Computer

Controller

RS-232.

RS-232, also known as RS-232C and TIA/EIA-232-E, is a

group of electrical, functional, and mechanical specifications

for interfaces between computers, terminals, and modems.

The RS-232 standard was developed by the Electrical Industries

Association (EIA), and it defines requirements for connecting

data communications equipment (DCE)—modems, converters,

etc.—and data terminal equipment (DTE)—computers,

controllers, etc.) devices.

The standard, which is functionally equivalent to ITU

V.24/V.28, specifies the workings of the interface, circuitry,

and connector pinning. Both sync and async binary data

transmission fall under RS-232. Most PCs use the RS-232

interface to transmit data to modems, and some printers

even use it.

Although RS-232 is a “standard,” you cannot necessarily

expect seamless communications between two RS-232 devices.

Why? Because different devices have different circuitry or

pinning, and different wires may be designated to perform

different functions.

The typical RS-232 connector is DB25, but some PCs and

other data communication devices have DB9 connectors.

To connect 9-pin PC ports to devices with 25-pin connectors,

you need a simple adapter cable. The most commonly used

interface, RS-232 is ideal for transmitting data at speeds up

to 20 kbps and over distances up to 50 feet (15.2 m).

Technically Speaking

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TECH SPECS

DCD — Constantly ON or controlled by RTS (selectable per port)

Operation — Emulates point-to-point, half- or full duplex switched or

dedicated line

Ring Indicator — Constantly ON

RTS/CTS Delay — ME242A-M: 0 or 6.6 ms (selectable per port);

ME1240A-F, ME900A-M, ME900A-F: 0, 6.6, or 53 ms

(selectable per port)

Speed — ME242A-M: 7, 14, 28, 56, 112, or 224 kbps (selectable);

ME1240A-F: From internal clock: 1200, 2400, 4800, or

9600 bps; 19.2 or 38.4 kbps (selectable);

From external clock: 38.4 kbps;

ME900A-M, ME900A-F: 1200, 2400, 4800, or 9600 bps; 19.2 kbps

(selectable)

Interface — RS-232 synchronous

Connectors — ME242A-M, ME900A-M: (2) DB25 male;

ME1240A-F, ME900A-F: (2) DB25 female

Indicators — (2) Tri-state LEDs for Receive Data (RD), Request to Send

(RTS), and Data Carrier Detect (DCD)

Power — From the interface

Size — 1.2"H x 2"W x 5.3"D (3 x 5.1 x 13.5 cm)

Item Code

High-Speed Sync Modem Eliminator-Nonpowered

224 kbps, DB25 Male ME242A-M

Synchronous Modem Eliminators-Nonpowered

38.4 kbps

DB25 Female ME1240A-F

19.2 kbps

DB25 Male ME900A-M

DB25 Female ME900A-F

You might also need…

RS-232 Cable, 25-Conductor,

10-ft. (3-m) ECM25T-0010

(For other RS-232 cable lengths, call our FREE Tech Support.)

Modem eliminators.

Understanding the process of elimination.

If your office environment has sync equipment, and if that

equipment is also used for local data communications, you

should consider replacing those modems with cost-effective

and versatile modem eliminators.

What does a modem eliminator do?

One modem eliminator can connect a local terminal and

computer port in lieu of the pair of modems that they would

normally connect to. Plus, a modem eliminator enables

DCE-to-DTE data and control-signal connections that are

not easily achieved by standard cables or connectors in a

sync environment.

Basically, a modem eliminator simulates a sync data link.

It does this two ways. First, it provides clocking, which is

mandatory for sync devices to communicate. Second, it

provides the handshaking that DCEs do.

Three reasons to use a modem eliminator:

One—if you have two sync DTEs in the same room or close

to each other, you will need a modem eliminator.

Tw o — if you have a network with routers, you just found

the perfect equipment tester.

A modem eliminator can enable in-house bench testing

of routers or existing equipment. There’s no need to place

routers all over your network only to find out they don’t work

once you test the LAN. A modem eliminator tells you what

equipment passes your tests before you install.

Three—a modem eliminator makes good economic sense.

One does the job of two modems—and it does the job better.

You get a high return on your investment.

Technically Speaking

ME1240A-F

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