Black Box V.24/X.21 Manuale utente

FEBRUARY 1998

IC933A

IC944A

V.24/X.21 Interface Converter

X.21/V.24 Interface Converter

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]

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

1. Specifications

Speed — Up to 200 Kbps

Length — 6.5 feet (2 m)

Operation — Synchronous, full- or half-duplex

Interfaces — RS-232C/V.24, X.21

Connectors — IC933A: (1) DB25 (male) DTE,

(1) DB15 (male) DCE;

IC944A: (1) DB25 (male) DCE,

(1) DB15 (female) DTE

Power — 6.3 volts DC (35 mw) from pin 2,

4, or 20 of the RS-232 interface

Size — 0.9"H x 2.1"W x 4.3"D

(2.2 x 5.5 x 9 cm)

Weight — 0.8 lb. (0.4 kg)

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

2. Features

•Converts RS-232/V.24 to X.21 interface

and vice versa.

•Equipped with cable and connectors.

•Transparent to protocol.

•Installs immediately.

•Operates without AC power.

•Compact and lightweight.

•Bidirectional data transfer.

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

3. General

The V.24/X.21 Interface Converter Model IC933A

connects and converts from V.24 DTE to X.21

DCE. Model IC944A connects and converts from

X.21 DTE to V.24 DCE. Users can take advantage

of high-speed trunk lines with X.21 interfaces and

still use existing V.24 multiplexers, modems, and

terminals. The compact, lightweight conversion

unit provides complete electrical and mechanical

conversion. It operates without mains power supply

by using ultra low power from the standard

RS-232C/V.24 data and control signal voltages.

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

4. Applications

Model IC933A installs between a V.24 terminal

or multiplexor and an X.21 modem and Model

IC944A installs between an X.21 terminal or

multiplexor and a V.24 modem. Figures 4-1

and 4-2 illustrate these applications.

Figure 4-1. Typical Application of the IC933A.

Figure 4-2. Typical Application of the IC944A.

X.21

MODEM

TERMINAL OR

MUX

IC933A

V.24/X.21

V.24

X.21

MODEM

TERMINAL OR

MUX

IC944A

X.21/V.24 V.24

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

5. Installation

5.1 Installing the V.24 DTE/X.21 DCE (IC933A) Model

To install the unit, simply plug its DB25 (male)

connector directly into the DB25 (female)

connector on the RS-232/V.24 device (DTE).

Attach the unit’s DB15 (male) connector to the

DB15 (female) connector on the X.21 device

(DCE).*

5.2 Installing the X.21 DTE/V.24 DCE (IC944A) Model

To install the unit, simply plug its DB15 (female)

connector into the DB15 (male) connector on the

X.21 device (DTE). Attach the unit’s DB25 (male)

connector to the DB25 (female) connector on the

V.24 device (DCE).*

*NOTE

If you need to change the gender of the unit’s connectors,

use gender changers or short cables. Do not use extreme

lengths of cable. Since the unit operates at low power,

using cables that are too long will affect the unit’s operation.

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

6. Pinning Diagrams

Figures 6-1 and 6-2 show the pinning of each unit.

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

Figure 6-1. IC933A Pinning.

RTS 410

C-b

C-a

CTS

V.24 DTE/X.21 DCE

Schematic Diagram

V.24 (DTE) X.21 (DCE)

DB25 (Male) DB15 (Male)

DCD

I-b

I-a

S-b

S-a

T-b

T-a

R-b

R-a

DSR

DTR

Signal GND

Protective

GND

Shield

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

Figure 6-2. IC944A Pinning.

I-b

I-a

C-b

C-a

S-b

S-a

T-b

T-a

R-b

R-a

Shield

Signal GND

RTS

DCD

X.21 DTE/V.24 DCE

Schematic Diagram

Protective GND

Signal GND

DSR

DTR

Ck In

Data In

Ck In

Data Out

Elastic

Buffer

V.24 (DCE)

DB25 (Male)

X.21 (DTE)

DB15 (Female)

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