Black Box ME251A-R3 User manual

Replaces a pair of modems to connect

IBM mainframes, minicomputers, and controllers.

Replaces a pair of modems to connect

IBM mainframes, minicomputers, and controllers.

Synchronous Modem Eliminator (SME-4M)

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

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2 of 3

FEATURES

• Replaces two modems in point-to-point

applications.

• Speeds up to 38.4 kbps.

• Small and lightweight. Easy to install

or replace in the field.

• LEDs show DSR, CTS, and TXD for

both ports.

• Front-panel switches set signals and

select test mode.

• Operates transparently, sync or async.

IBM compatibility at two different speeds. Runs sync or async, too!

OVERVIEW

The Synchronous Modem Eliminator (SME-4M) enables

a mainframe or minicomputer to communicate locally with

another mainframe, minicomputer, or remote controller.

And best of all, it saves you money because the SME-4M

replaces the two modems or line drivers normally needed

for such communication.

Just one versatile SME-4M enables asynchronous,

synchronous, or bisynchronous communications between

two DTEs over RS-232C cable.

In synchronous mode, the unit operates at data rates that

top out at 38.4 kbps. Plus the SME-4M operates transparently

in either synchronous or asynchronous mode. You can also

configure the SME-4M to operate at some nonstandard data

transmission speeds. To set the SME-4M for one of these

speeds, configure the unit according to the chart on the right.

The SME-4M is small and lightweight, so it’s easy to handle.

And because no special tools are needed, installation is simple.

The modem eliminator’s front panel has six LEDs and

three switches. The six LEDs indicate Clear To Send (CTS),

Transmitted Data (TXD), and Data Set Ready (DSR) for each

port. The three switches include Ring Indicator (RI) and

Control Data Set Ready (CON) signals, and (LB) selects the

Digital Loopback Test Mode.

Use the SME-4M’s diagnostic loopback capability to test

asynchronous applications. Simply press the switch and enter

data at the host terminal or computer. That data should

return to you exactly as you sent it.

The unit fits neatly on a desktop. Each SME-4M is shipped

with a 115-VAC power transformer and a user’s manual.

SME-4M

(ME251A-R3)

IBM®

mainframe

RS-232 Cable

(ECM25C)

RS-232 Cable

(ECM25C) S/3X or

AS/400®host

2/22/2007

#10205

724-746-5500 blackbox.com

Strap Position Transmission Rate (bps)

a 76,800

b 153,600

38,400 38,400

19,200 19,200

9600 9600

4800 4800

2400 2400

1200 1200

Crystal Frequency 2.4576 MHz

Buyer’s Guide Transmission Speeds

3 of 3

TECH SPECS

Clock — Internal or external

Diagnostics — Bidirectional loopback (async)

Operation — Full or half-duplex

Protocol — Async or sync

Speed — 1.2, 2.4, 4.8, 9.6, 19.2, and 38.4 kbps

User Controls — (3) switches: Ring Indicator (RI), Control Data Set Ready

(CON), Digital Loopback Test Mode (LB)

Interface — RS-232

Connectors — (2) DB25 F

Indicators — (6) LEDs: DSR, CTS, TXD for each of the two ports

Power — 115 VAC/60 Hz, 10 watts

Size — 1.8"H x 5.5"W x 8.6"D (4.6 x 14 x 21.8 cm)

Weight — 2 lb. (0.9 kg)

Item Code

Synchronous Modem Eliminator (SME-4M) for RS-232

38.4-kbps

Standalone (115-VAC) ME251A-R3

For optimum performance and a 20% savings, order…

RS-232 Cable, 25-Conductor, 10-ft. (3-m) ECM25C-0010

2/22/2007

#10205

Recognize any of these situations?

• You wait more than 30 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

far 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.

Why Buy From Black Box? Exceptional Value.

Exceptional Tech Support. Period.

724-746-5500 blackbox.com

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