Black Box SHM-NPR Plus Series Manuale utente
MAY 1997
ME739A-F-R2
ME739A-M-R2
SHM-NPR Plus
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
SHM-NPR PLUS
1
FCC STATEMENT
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 B 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.
2
SHM-NPR PLUS
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.
3
NOM STATEMENT
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.
4
SHM-NPR PLUS
TRADEMARKS USED IN THIS MANUAL
Any trademarks mentioned in this manual are acknowledged
to be the property of the trademark owners.
5
CHAPTER 1: Specifications
1. Specifications
Interface — EIA RS-232/CCITT V.24, DCE
Protocol — Asynchronous
Data Format — Transparent to data format
Operation — 2-wire full-duplex
Data Rate — Up to 19,200 bps
Maximum Distance (Transmission Range) — See chart
on next page
Transmission Line — 2-wire unconditioned telco-type
line or single coaxial cable
Transmission Level — 0 dBm
Transmission Controls — DCD always on;
DTR can control carrier;
DSR turns on immediately
after carrier detection;
CTS turns on immediately
after computer or terminal
raises RTS
Carrier Control — Carrier can be continuously held high
or controlled by DTR (user-
selectable)
User Control — (1) Internal strap (jumper) for carrier
control
6
SHM-NPR PLUS
Connectors — DTE side: Side-mounted DB25 male
(ME739A-M-R2) or female (ME739A-F-R2);
Line side: Internal 3-screw terminal block
(for one ground wire and two data
wires) with cable-strain relief
Temperature Tolerance — 32 to 122°F (0 to 50°C)
Humidity Tolerance — Up to 95% noncondensing
Enclosure — High-impact plastic
Power — +6 VDC, 25 milliwatts from Pin 2, 4, or 20 of
the RS-232 interface
Size — 0.9"H x 2.1"W x 4.3"L (2.2 x 5.3 x 11 cm)
Weight — 0.2 lb. (0.1 kg)
Approximate Transmission Range
WIRE GAUGE
RG62 COAX 19 22 24
M FEET M FEET M FEET M FEET
500 1650 1000 3300 600 2000 400 1300
7
CHAPTER 2: Introduction
2. Introduction
The SHM-NPR Plus (Short-Haul Modem [Nonpowered]
Plus) is intended to be used for local data distribution:
Two of them carry asynchronous communication between
computers and terminals. The SHM-NPR Plus operates
full-duplex over two twisted pairs or a single coax line.
Figure 2-1 below shows a typical application.
You can strap the SHM-NPR Plus’s transmit carrier to be
constantly on or to follow (be controlled by) the DTR
signal. In controlled operation, the local SHM-NPR Plus
raises carrier as soon as it sees DTR from the local DTE;
when the remote SHM-NPR Plus sees carrier, it raises DSR
Figure 2-1. Typical application.
SHM-
NPR
Plus
SHM-
NPR
Plus
Single Twisted Pair or
Single Coax Cable
Computer or
Data PABX
with Async
Comm Port
Computer or
Terminal with
Async Comm
Port
8
SHM-NPR PLUS
to the remote DTE. In this way, one control signal can
be passed end-to-end across the link. (DCD is always
on regardless of how transmit carrier is strapped.)
The SHM-NPR Plus operates without a power-supply
transformer. To operate properly, it must at least be
connected to a DTE’s Transmit Data (TD, Pin 2), Receive
Data (RD, Pin 3), and Signal Ground (SGND, Pin 7) lines.
In compliance with the RS-232/V.24 standard, the
SHM-NPR Plus generates positive and negative signals
regardless of the state of Transmit Data; that is, the line
may be constantly high or constantly low.
9
CHAPTER 3: Installation
3. Installation
To install the SHM-NPR Plus, take these steps:
1. Separate the two halves of the unit’s plastic
cover by pressing the marked areas on the
sides of the cover. (Start at the cable end.)
2. For a coax connection:
Connect the coax cable’s shielding and center
wire to the pair of connectors marked LINE
on the SHM-NPR Plus’s screw-terminal block.
(The SHM-NPR Plus isn’t polarity-sensitive:
It doesn’t matter which of the LINE terminals
you attach shield to and which one you attach
the center wire to.) Don’t attach anything to
the SHM-NPR Plus’s GND terminal.
For a twisted-pair connection:
Connect the twisted-pair cable’s two wires
to the pair of connectors marked LINE
on the SHM-NPR Plus’s screw-terminal block.
(The SHM-NPR Plus isn’t polarity-sensitive:
It doesn’t matter which of the LINE terminals
you attach which wire to.) If the twisted-pair
cable is shielded, attach the shield to the
SHM-NPR Plus’s GND terminal.
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