Black Box MD3450A, MD3451A, MD3452A Specifications

Transmit or receive
data through harsh
conditions at speeds
up to 33.6 kbps.

Connect to any
PLC, RTU, or other
industrial equipment.

Mount easily to DIN
rails or flat panels.

Rugged casing and
protected circuitry.

DC powered—no AC
adapters required.

Windows

®

compatible.

Compliant with
telephone systems
around the world.

Y

ou can eliminate the difficulties

often encountered with
installing office-grade modems
in severe environments. Just
connect these pocket modems
to any programmable logic
controller (PLC), remote telemetry
unit (RTU), or other industrial
equipment. The Industrial Pocket
Modems provide the reliability
and features you need to get the
data through!

Choose from General­Purpose, PLC Self-Dialing, or
RS-422/RS-485 models.

All modems are DC powered,
which means clunky AC adapters
won’t cramp your style. Mount
them to a DIN rail or flat panel.

Generally speaking.

The General-Purpose
Industrial Pocket Modem
(MD3450A) is designed for
electrical enclosures located in
harsh environments. It supports
all AT commands and S-registers,

Their consistent performance and

reliability will redefine industriousness

for industrial modems.

Key Features

INDUSTRIAL POCKET MODEMS

enabling it also to be set up as an
external modem for any PC. Use it
with any telecommunication or
dialup networking software to
establish dialup connections.

When you need a modem
that’s tough enough for some of
the toughest environments, count
on the General-Purpose Industrial
Pocket Modem. It handles the
hazards of Class I, Division 2
(Zone 2) locations, and it operates
in temperature extremes between

-22 to +158°F (-30 to +70°C).

Alarming news that’s good.

In addition to all the features
of the General-Purpose Modem,
the PLC Self-Dialing version
(MD3451A) sports PLC self-dialing
capabilities. It automatically dials
out based upon an alarm using a
PLC coil output.

Once a connection has been
established, the PLC’s system
(programming) port is connected
to the central computer at the

other end of the phone link. At this
time, the PLC may be polled by the
computer as if the computer itself
had originated the call.

When the PLC Self-Dialing
Industrial Modem connects to the
computer, it identifies itself so the
computer can run the appropriate
I/O driver and interrogate the PLC.
The modem works with all brands
and models of PLCs.

Locations that don’t have PLCs
also can originate calls to alert
you to low tank levels,
temperature conditions, or other
alarms—just connect the
appropriate alarm contact to the
modem’s input. When conditions
warrant, the Self-Dialing modem
will dial the pre-stored number
and deliver the ID message to the
computer at the receiving end.
For example, the modem can be
used to report low tank levels with
a level switch.

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

© 2001. All rights reserved.

Black Box Corporation.

05/31/2001 #25663

(continued on page 2)

• (1) 6-ft. (1.8-m) DB9 male/female cable.

• (1) CD-ROM

• Users’ manual

Approvals: CE

Command Modes: All AT and

S-register commands, including
Class 1 & 2 fax commands

Data Compression: V.42 bis, MNP

®

5

Distance: MD3452A: Up to 0.5 mi.

(0.8 km) maximum

Electrical Safety:

AS/NZS3260-1993;
Cenelec: EN61010-1 (IEC1010);
CSA: C22.2/14;
IEC: 950;
UL

®

508

EMC Immunity: EN50082-1

(IEC801-2, 3, 4)

EMI Emissions:

AS/NZS3458-1995;
Cenelec: EN55022;
FCC: Part 15, ICES-003, Class A

Error Correction: V.42, MNP 2–4

Fax Standards: Group III

Flammability: UL

®

94V-0 materials

Hazardous Locations:

Cenelec: EN50021 (EEx nA II T4);
Class I, Division 2, Groups A, B, C,

D (Zone 2);
CSA: C22.2/213-M1987;
UL

®

1604

Modem Standards: ITU: V.34+, V.34,

V.32 bis, V.32, V.23, V.22, V.21;
Bell: 212A, 103

Mounting: DIN rail or panel

Operating Environment:

Temperature: -22 to +158°F

(-30 to +70°C);
Humidity: 5 to 95%

(noncondensing)

Operation: MD3452A only:

RS-422: 4-wire full duplex;
RS-485A: 2- or 4-wire party-line

operation

Protocol: Asynchronous

Ringer Equivalency: 0.3

RS-232 Leads Supported: TX, RX,

CTS, RTS, DCD, DTR, DSR, RI,
GND

Speed: Fax: Up to 14.4 kbps;

Line: Up to 33.6 kbps;
RS-232 port: Up to 115.2 kbps

Surge Withstand: IEEE 472

(ANSI C37.90)

Telecomm Certifications:

ACA: TS 001-1997, TS 002-1997;
FCC: Part 68;
Industry Canada:

CS03-8, CTR21 (98/482/EC)

Vibration: IEC68-2-6

Interface: All: RS-232;

MD3452A only: Also has

RS-422/RS-485

Connectors: All: (1) DB9 F;

MD3450A–MD3451A: (2) RJ-11;
MD3452A: (1) RJ-11, (1) 5-screw

terminal block

Indicators: LEDs: CD (carrier

detected on phone line), TR (host
connected and ready), RD (data
coming from serial port), TD (data
sent from serial port), Power

Power: MD3450A–MD3451A:

10– 30 VDC, 65 mA directly
from 12- or 24-VDC power
source;

MD3452A: 10– 52 VDC, 65 mA

directly from 48-VDC power
source

Size: 1.4"H x 4.8"W x 3.2"D

(3.6 x 12.2 x 8.1 cm)

Weight: 0.5 lb. (0.2 kg)

MD3451A and MD3452A include:

Specifications

Ordering Information

ITEM CODE

Industrial Pocket Modems

General-Purpose .................................................MD3450A

PLC Self-Dialing ...................................................MD3451A

RS-422/RS-485......................................................MD3452A

Y

ou may also want to order cable…

DB9 Extension Cable ...........................EDN12H-0010-MF

With its auto-answer function,
you also can use the PLC Self­Dialing Industrial Pocket Modem
for two-way operation. The unit is
user-configurable—just use the
supplied CD-ROM.

Meeting high standards also is
what this modem is all about. It’s
rated for UL

®

508, CSA, and CE
approvals. Find out today what
the experts already know!

(continued from page 1) More connections— and more

power to you.

The RS-422/RS-485 Industrial
Pocket Modem (MD3452A) also
features the basic functions of
the General-Purpose Industrial
Pocket Modem and includes
an RS-422/RS-485 port. This
additional port supports 4-wire
full-duplex communication to
RS-422 devices and party-line
operation to 2- or 4-wire RS-485
equipment.

This modem can be
connected to existing multi-drop
devices and directly to industrial
inputs and outputs.

The RS-422/RS-485 Industrial
Pocket Modem is powered
directly from a 48-VDC source.

An included CD-ROM enables
you to configure the unit.

They’re built like (think) tanks.

The rugged casing and
protected circuitry keep the
Industrial Pocket Modems
working under conditions that will
cause office-grade modems to
fail. Face it, industrial applications
are demanding. But our modems
handle temperature extremes,
power spikes, and other threats.

All in the family.

Our modems contain an
industrial version of the same
modem chip set found in PC
internal modems. They support
a full set of AT commands and
protocols, plus they are fully
compatible with Windows

®

.

The get-along gang.

These modems are compliant
with telephone systems around
the world. So why not simplify
your industrial communications
and improve your bottom line?
Choose BLACK BOX

®

Industrial

Pocket Modems!