Black Box TL073A-R4 Installation Manual

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INFORMATION

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Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
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APRIL 2000

TL073A-R2
TL073A-R3
TL074A-R2
TL074A-R3

BC00702

FA520A-R2

Modem Splitters

MS-3

1

T

R

O

P

R

O

P

R

O

P

PORT 3

1

T

2

T

PORT 2

PORT 3

R

PO

PORT 5

PORT 6

T 4

MS-6

MASTER

MASTER PORT

1

MODEM SPLITTERS

TRADEMARKS USED IN THIS MANUAL
Any trademarks used in this manual are acknowledged to be the property of the

trademark owners.

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MODEM SPLITTERS

FEDERAL COMMUNICATIONS COMMISSION

AND

CANADIAN DEPARTMENT OF COMMUNICATIONS

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio frequency energy and if not
installed and used properly, that is, in strict accordance with the manufacturer’s
instructions, may cause interference to radio communication. It has been tested
and found to comply with the limits for a Class A computing device in accordance
with the specifications in Subpart J of Part 15 of FCC rules, which are designed to
provide reasonable protection against such interference when the equipment is
operated in a commercial environment. Operation of this equipment in a
residential area is likely to cause interference, in which case the user at his own
expense will be required to take whatever measures may be necessary to correct the
interference.

Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from digital
apparatus set out in the Radio Interference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par Industrie Canada.

3

MODEM SPLITTERS

NORMAS OFICIALES MEXICANAS (NOM)

ELECTRICAL SAFETY STATEMENT

INSTRUCCIONES DE SEGURIDAD

1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de
que el aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc..

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que
sean recomendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá
a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser
referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá,
alfombra o superficie similar puede bloquea la ventilación, no se debe colocar
en libreros o gabinetes que impidan el flujo de aire por los orificios de
ventilación.

10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.

11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del
tipo descrito en el instructivo de operación, o como se indique en el aparato.

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MODEM SPLITTERS

12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen del
aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas
de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.

18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u

B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su

desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

5

MODEM SPLITTERS

1. Specifications

Interface — RS-232-C
Configuration — MASTER Connector is DTE; PORT Connectors are DCE
Pins Supported — 1 (FG), 2 (TD), 3 (RD), 4 (RTS), 5 (CTS), 6 (DSR), 7 (SG),

8 (DCD), 15 (TC), 17 (RC), 20 (DTR)

Connectors — DB25s (female)
Temperature — 32 to 122°F (0 to 50°C)
Humidity — Up to 95% noncondensing
Size — 7.5"H x 2.5"W x 1.3"D (19.1 x 6.4 x 3.3 cm)
Weight — 2 lb. (0.9 kg)

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MODEM SPLITTERS

2. Introduction

The Modem Splitter allows an RS-232-C DCE device, such as a modem, to interface
with up to six RS-232-C DTE devices, such as terminals. The MS-3 will support up to
three additional units. The MS-6 will support up to six additional units. The
MASTER port is configured DTE and PORTS 1–6 are configured DCE. No
jumpers and/or switches are located on the Modem Splitter. See Figure 1 for
typical applications.

A 6-ft. DB25 male/DB25 female extension cable and a serial AT adapter (DB9
female/DB25 male) are included with the TL073A-R3 and TL074A-R3 Modem
Splitters. If you ordered the TL073A-R2 or TL074A-R2 Modem Splitters, you will not

receive the cable or the adapter.

Figure 1. Typical Applications.

Terminals

Terminals

MS-3

MS-6

Modem

Modem

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MODEM SPLITTERS

3. Theor y of Operation

Signals present on the MASTER connector at pins 1, 3, 5, 6, 7, 8, 15, and 17 are
sent to the corresponding pins on each of the PORT connectors. Signals present
on the PORT connectors at pins 2, 4, and 20 are passively stored and sent to the
corresponding pins on the MASTER connector.

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MODEM SPLITTERS

4. Installation

The Modem Splitter is a passive device. The total length of cable connected to the
unit should be less than 50 feet (15.2 m). All connectors on the Modem Splitter
are DB25s (female).

The Modem Splitter is easily installed into a system by plugging the terminals into
the Modem Splitter connectors labeled PORT 1 through PORT 3 or through
PORT 6. The cable from the modem connects to the connector labeled MASTER.
To ensure proper operation, the following guidelines should be followed:

1. The terminal devices connected to the Modem Splitter must be configured as
DTE (Data Terminal Equipment) devices. The modem device they will share
must be configured as DCE (Data Communication Equipment). Refer to your
terminal or modem installation manual if you are unsure of this requirement.
Generally speaking, terminals are DTE devices and modems are DCE devices.

2. Data coming onto the MASTER port on pin 3 of the Modem Splitter goes to
all three or six terminal ports since they are all tied common. However, only
only one terminal may transmit data to the modem at any one time. The
transmit leads (pin 2) are not tied common and all terminals are isolated
from each other by an OR gate.

9

MODEM SPLITTERS

5. Wiring Configuration

Three lines are isolated from each other in the Modem Splitter by OR gates. They
are as follows:

Pin 2, Transmitted Data
Pin 4, Request to Send
Pin 20, Data Terminal Ready

Figure 2 illustrates the wiring configuration for these leads.

Figure 2. OR Gate Wiring for Pins 2, 4, and 20.

Eight other leads are tied straight through and are illustrated in Figure 3. They are
as follows:

Pin 1, Protective Ground
Pin 3, Received Data
Pin 5, Clear To Send
Pin 6, Data Set Ready
Pin 7 Signal Ground
Pin 8, Received Line Signal Detector
Pin 15, Transmitter Signal Element Timing (DCE)
Pin 17, Received Element Signal Timing (DCE)

PORT 1

PORT 2

PORT 3

MASTER

PORT 4

PORT 5

PORT 6

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MODEM SPLITTERS

Figure 3. Configuration for Pins 1, 3, 5, 6, 7, 8, 15, and 17.

Table 1. Modem Splitter Pinout

Signal Direction

Pin EIA Circuit Description to DCE from DCE

1 1AA Protective Ground — —
2 BA Transmitted Data X
3 BB Received Data X
4 CA Request To Send X
5 CB Clear To Send X
6 CC Data Set Ready X
7 AB Signal Ground — —

8 CF Received Line Signal Detector X
15 DB Transmitter Signal Element Timing (DCE) X
17 DD Receiver Signal Element Timing (DCE) X
20 CD Data Terminal Ready X

Figure 4. Standard RS-232 Interface.

PORT 1

PORT 2

MASTER

PORT 3

PORT 4

PORT 5

PORT 6

Signal

Destination

Secondary Transmitted Data

DCE Transmitter Signal

Element Timing

Secondary Received Data

Receiver Signal Element

Secondary Request to Send

Data Terminal Ready

Signal Quality Detector

Data Signal Rate Selector

Ring Indicator

DTE Transmitter Signal

Element Timing

Signal

Destination

Timing

Pin

Number

14
15
16
17
18
19
20
21
22
23
24
25

Pin

Number

1 Protective Ground
2 Transmitted Data
3 Received Data
4 Request to Send
5 Clear to Send
6 Data Set Ready
7 Signal Ground/Common Return
8 Received Line Signal Detector
9 + Voltage
10 – Voltage
11
12 Secondary Received Line Signal Indicator
13 Secondary Clear to Send

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]

© Copyright 2000. Black Box Corporation. All rights reserved.