Black Box MPI Series User manual

NOVEMBER 1996
ME761A-M/F
Mini Driver MPI
CUSTOMER SUPPORT INFORMATION
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Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
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MINI DRIVER
MPI

MINI DRIVER MPI
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
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 classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par Industrie Canada.
TRADEMARKS USED IN THIS MANUAL
Any trademarks mentioned in this manual are acknowledged
to be the property of the trademark owners.

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MINI DRIVER MPI
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.

MINI DRIVER MPI
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.
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.
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MINI DRIVER MPI
1. Specifications
Protocol: Asynchronous
Speed: Up to 19.2 Kbps
Operation: 4-wire full- or half-duplex, point-
to-point or multipoint
Interface: RS-232/CCITT V.24
Connectors: (1) DB25 male or female,
(1) 5-screw terminal block
Power: From RS232 interface; +6 VDC on
pins 2, 4, or 20
Size: 0.9"H x 2.1"W x 4.3"D
(2.3 x 5.3 x 10.9 cm)
Weight: 0.2 lb. (0.1 kg)

Distance Charts:
Point-to-Point Applications
19-AWG 24-AWG 26-AWG
1200 - 19200 bps 4.0 mi. 2.5 mi. 1.5 mi.
(6.5 km) (4.0 km) (2.5 km)
Multipoint Applications
No. of
Drops 3 5 7
19-AWG 19-AWG 19-AWG
1200 -
19200 bps 1.0 mi 0.75 mi. 0.5 mi.
(1.6 km) (1.2 km) (0.8 km)
2. Introduction
The Mini Driver MPI asynchronous line driver is
used for local data distribution. It connects full-or
half-duplex asynchronous terminals to computers.
The unit operates over unconditioned 4-wire
telephone line, and ensures data integrity for
distances up to four miles depending on the gauge
and data rate (see the Distance Charts, above).
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MINI DRIVER MPI

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MINI DRIVER MPI
You can strap the Mini Driver MPI to be either
constantly on, or to be controlled by the Request to
Send signal. Operation with controlled carrier
enables the connection of the Mini Driver MPI in a
multipoint configuration (see Figure 1). You can also
use controlled carrier in applications requiring the
passing of a control signal end-to-end—the RTS one
one Mini Driver MPI is passed to the DCD on the
other unit.
Figure 1. Mini Driver MPI In A Multipoint Application
The Mini Driver MPI features a switch selectable
DTE/DCE option. The unit can operate as a DTE
in order to connect to another DCE, such as a
multiplexer port, without the use of cross cable.
You can operate the Mini Driver MPI without
Async Host
Async Terminals
Mini
Driver
MPI
OFFICE COMPLEX
Building A:
MIS DEPT.
Building B:
ACCT. DEPT
Up to seven
drops
4-Wire Unshielded
twisted-pair cable

connecting it to the mains supply. Simply use ultra
low power from the standard RS232C/V.24 data and
control signal voltages. The unit fully operates even
if only Transmit Data and Receive Data are
connected—no control signals are needed. Both
positive and negative signals are generated in
compliance with RS232C/V.24 standards, regardless
of constantly high or constantly low Transmit Data.
Low transmit level minimizes cross-talk onto adjacent
circuits within the same cable. Data is transmitted
and received at a balanced impedance, ensuring
excellent immunity to circuit noise.
The Mini Driver MPI is couples to the telephone line
through isolation transformers which, in conjunction
with electronic circuitry, protect against AC or DC
overvoltages. The transformers are rated at over
1,500V RMS, making the line driver suitable for
connection to local circuits provided by most
telephone administrations.
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MINI DRIVER MPI

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MINI DRIVER MPI
3. Installation
The Mini Driver MPI is easy to install. Follow the
steps below.
1.Separate the two parts of the plastic cover
by firmly pressing the marked places on the
sides, starting at the cable end.
2.Connect the 4-wire telephone line to the
screw terminal block; transmit pair to
"XMT" and receive pair to "RCV". Please
note the correct polarities. If you are using
shielded cables, connect the cable shield to
the "ground" terminal (optional).
3.The following polarity must be observed:
+XMT on the local Mini Driver MPI must
be connected to +RCV on the remote Mini
Driver MPI
-XMT on the local Mini Driver MPI must be
connected to -RCV on the remote Mini
Driver MPI
(Polarity is opposite on the second pair of
wires.)
4.The Mini Driver MPI is factory set for DCE.
To operate the unit as DTE, change the
switch to the DTE position (see Figure 2).

5.Set the CARRIER strap to either ON
(carrier on continuously), or CTRL (carrier
controlled by RTS). See Figure 2
6.To close the unit, press the two halves of
the cover together.
7. Plug the unit directly into the 25-pin
connector of the terminal or computer
port, and fasten with the screws on each
side of the connector.
Figure 2. Strapping Diagram
RCV
GND
XMT
+
-
+
-
CTRL ON
CARRIER DCE
DTE
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MINI DRIVER MPI

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MINI DRIVER MPI
DCE/DTE Switch Schematics
DTE Position DCE Position
TD 2 - - > TD 2 <- - -
RD 3< - - RD 3 - - >
RTS 4 RTS 4------DCD CIRCUIT
CTS 5 CTS 5
DSR 6 (+V) DSR 6
DCD 8-----DCD CIRCUIT DCD 8
DTR 20 DTR 20 (+V)
delay

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1996. Black Box Corporation. All rights reserved.