Black Box ME1240A-F Manuale utente

JULY 2003

ME1240A-F ME1243A-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]

Miniature Modem Eliminators

Features 1

ME1240A-F, ME1243A-M

1. Features

Miniature modem eliminators:

• Synchronous operation

• Selectable data rates up to 38.4 kbps (ME1240A-F) or 64 kbps (ME1243A-F)

• V.24 (ME1240A-F) or V.35 (ME1243A-F)

• Range of 30m/99 ft (ME1240A-F) or 75m/247 ft (ME1243A-F) on each side

• Selectable RTS to CTS delay

• Carrier controlled or constantly ON

• Easy to install and configure

• Miniature, lightweight.

Versions

The following versions of the modem eliminators are available:

• ME1240A-F – modem eliminator with RS-232/V.24 interface, operating with

internal or external clock at data rates of up to 38.4 kbps

• ME1243A-F – modem eliminator with V.35 interface, operating with internal

clock at 64 kbps.

Application

Host Terminal

ME1240A-F,

ME1243A-F

Figure 1. Typical Application

ME1240A-F, ME1243A-M

2 Technical Specifications

2. Description

ME1240A-F and ME1243A-F are miniature modem eliminators, which replace two

synchronous modems by permitting direct port-to-port connection, as shown in

Figure 1.

The modem eliminators operate at to 38.4 kbps (ME1240A-F) or 64 kbps

(ME1243A-F), connecting two synchronous DTEs at ranges of up 30m/99 ft

(ME1240A-F) or 75m/247 ft (ME1243A-F) on each side.

The delay between RTS and CTS can be independently set on either port to 0, 6.6

or 53 msec for ME1240A-F or 0, 7, or 64 msec for ME1243A-F.

The DCD signal can either be set to constantly ON, or used as a port-to-port

handshaking signal, where RTS on one port is converted to DCD on the other port.

Physical connection between ME1240A-F and its associated terminal and

computer is via D-type 25-pin female connectors.

Physical connection between ME1243A-F and its associated terminal and

computer is via two 34-pin V.35 female connectors on 85 cm (2.8 ft) cable.

3. Technical Specifications

Transmission Format Synchronous

Mode Emulates half or full duplex lines

Data Rate ME1240A-F: 2.4, 4.8, 9.6, 19.2, 38.4 kbps

ME1243A-F: 64 kbps

Range ME1240A-F: 30m (99 ft) on each side

ME1243A-F: 75m (247 ft) on each side

RTS/CTS Delay ME1240A-F: 0, 6.6 or 53 msec

ME1243A-F: 0, 7, or 64 msec

DCD Continuously ON or controlled by RTS from

the DTE on the other side

Interface ME1240A-F: V.24

ME1243A-F: V.35

Connectors ME1240A-F: D-type, 25-pin, female

ME1243A-F: 34-pin, female

Power No external power supply is required

Physical ME1240A-F

Height 30 mm / 1.2 in

Width 50 mm / 2.0 in

Depth 135 mm / 5.3 in

Weight 100g / 3.5 oz

ME1240A-F, ME1243A-M

Technical Specifications 3

ME1240A-F

Height 30 mm / 1.2 in

Width 50 mm / 2.0 in

Depth 130 mm / 5.1 in

Weight 300g / 10.5 oz

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

Humidity Up to 95%, non-condensing

ME1240A-F, ME1243A-M

4 Installation

4. Installation

This is a delicate instrument. Be careful when setting jumpers or performing any

actions within the product so that you do not break or shake any components.

Installation of the modem eliminators is simple and straightforward, just follow

these steps:

1. Separate the two parts of the plastic cover by firmly pressing the marked places

on the sides. If this is difficult, insert a small screwdriver into the slot, where

there is a small opening. Lift the handle, gently levering the tip of the

screwdriver down. The cover will separate without pressure.

Do not insert the screwdriver straight into the middle of the slot, as this may break

off the prongs which snap the cover together.

2. Configure the unit according to the desired mode, referring to Figure 2,

Figure 3 and Table 1.

DLY1

JP1 JP5

DLY2

J1 J2

JP7

GND

0 ms 0 ms

6.6 ms 6.6 ms

53 ms 53 ms

JP3

JP2

XMT

TIMING

BAUD RATE JP6JP4

ONON

CTRCTR

CARR2CARR1

EXT

INT

9.6

4.8

2.4

19.2

38.4

Figure 2. ME1240A-F Internal Jumper Locations

DLY-1 DLY-2

0 msec 0 msec

7 msec 7 msec

64 msec 64 msec

CD 1

CD 2

CTR

Figure 3. ME1243A-F Internal Jumper Locations

Table 1. Internal Jumper Settings

Jumper Function Possible Settings Default Setting

XMT TIMING

(ME1240A-F only)

Selects transmit timing for

ME1240A-F unit

INT – Internal

EXT – External from DTE

EXT

BAUD RATE

(ME1240A-F only)

Selects data rate for

ME1240A-F unit

38.4 – 38.4 kbps

19.2 – 19.2 kbps

9.6 – 9.6 kbps

4.8 – 4.8 kbps

2.4 – 2.4 kbps

9.6

Caution

ME1240A-F, ME1243A-M

Installation 5

Table 1. Internal Jumper Settings (Cont.)

Jumper Function Possible Settings Default Setting

CARR1 (ME1240A-F)

CD1 (ME1243A-F)

Selects the carrier to be

constantly ON or controlled

by RTS (port 1)

ON – Constantly ON

CTR – Controlled by RTS

CARR2 (ME1240A-F)

CD2 (ME1243A-F)

Selects the carrier to be

constantly ON or controlled

by RTS (port 2)

ON – Constantly ON

CTR – Controlled by RTS

DLY1 Selects delay between

receipt of RTS and CTS

(port 1)

ME1240A-F:

0ms

6.6 ms

53 ms

ME1243A-F:

0ms

7ms

64 ms

6.6

DLY2 Selects delay between

receipt of RTS and CTS

(port 2)

ME1240A-F:

0ms

6.6 ms

53 ms

ME1243A-F:

0ms

7ms

64 ms

6.6

GND (ME1240A-F only) Controls connection of the

protective ground to the

signal ground

Jumper plug is on –

Protective ground (AA) is

connected to the signal

ground (AB)

Jumper plug is off –

Protective ground (AA) is

disconnected from the signal

ground (AB)

Jumper plug is on

3. Close the unit and connect to the computer and terminal.

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