Black Box SHM-B Sync User manual

DECEMBER 1999
ME801A
ME801A-E
ME801-C
Short-Haul Modem-B Sync
(SHM-B Sync)
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 [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
SYNC SHORT HAUL MODEM
TD RD
NORMAL
LOOPBACK

1
FCC/IC RFI STATEMENTS
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.

2
SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)
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
SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)
Contents
Chapter Page
1. Specifications ......................................................................... 5
2. Introduction .......................................................................... 8
3. Configuration ........................................................................ 9
4. Installation ........................................................................... 12
4.1 Installing Standalone Units ........................................ 12
4.2 Installing Card Units .................................................. 15
4.3 Initial Testing .............................................................. 18
5. Operation ............................................................................. 19
5.1 Normal Operation and LED Functions .................... 19
5.2 The RS-232 Signals, Flow Control, and
Synchronous Timing ............................................... 20
6. Troubleshooting .................................................................. 24
6.1 Loopback Mode .......................................................... 24
6.2 Common Problems ..................................................... 26
6.3 Calling Black Box ........................................................ 31
6.4 Shipping and Packaging ............................................. 32
Appendix A: Distances, Data Rates, and Cable Specifications .. 33
Appendix B: Block Diagram ........................................................ 34

5
CHAPTER 1: Specifications
1. Specifications
Compliance — FCC Part 15 Subpart J Class A,
IC Class/classe A
Interfaces — RS-232-C (DCE) to attached local device;
Proprietary balanced 4-wire to line
Protocol — Synchronous
Clock Source — Local internal (each SHM-B Sync unit
independently generates its own clock)
Operation — 4-wire full-duplex
Flow Control — Hardware (RTS and/or DTR), local only
(control signals are not passed across the
4-wire line—see Section 5.2); transparent
to software (X-ON/X-OFF, etc.)
Data Rate — 19,200, 9600, 4800, 2400, 1200, or 600 bps
(user-selectable)
Maximum
Distance — See the table in Appendix A
Loopback — Simultaneous local loopback to attached
RS-232 device and remote loopback to
remote SHM-B Sync (user-controllable)

6
SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)
User Controls — (1) Front-mounted pushbutton to turn
loopback ON and OFF;
(6) Internal pairs of jumper posts for setting
the data rate;
(3) Internal pairs of jumper posts for setting
CTS delay
Indicators — (2)Front-mounted bicolor LEDs for transmit
status and receive status; these light green
for a “low” logic level (–3 to –25 V) or red
for a “high” logic level (+3 to +25 V)
Connectors — RS-232: (1) Rear-mounted DB25 female;
Line: (1) Internal 4-position screw-terminal
block
Leads/Signals
Supported — RS-232: Transmit Data (TD), Receive Data
(RD), Request to Send (RTS), Clear to
Send (CTS), Data Set Ready (DSR), Signal
Ground (SGND), Carrier Detect (CD),
Transmit Clock (TC), Receive Clock (RC),
and Data Terminal Ready (DTR)—
Pins 1 through 8, 15, 17, and 20
respectively;
Line: TX+, TX–, RX+, and RX–

7
CHAPTER 1: Specifications
Power — ME801A: From utility-power (mains) outlet
through wallmount transformer:
Input: 108 to 132 VAC, 60 Hz, at ~160 mA
(20 watts);
Output: 17 VAC CT at 700 mA;
ME801A-E: From utility-power (mains) outlet
through desktop transformer:
Input: 198 to 242 VAC, 50 or 60 Hz, at
~90 mA (20 watts);
Output: 17 VAC CT at 700 mA;
ME801-C: 17 VAC CT at 700 mA from rack’s
electrical-power bus
Surge Protection — Internal opto-isolators (effective up to
20 VDC) on transmit and receive lines
Temperature
Tolerance — 32 to 122˚F (0 to 50˚C)
Humidity
Tolerance — Up to 95% noncondensing
Enclosure — ME801A, ME801A-E: High-impact plastic
Size — ME801A, ME801A-E: 1.4"H x 4.3"W x 4.5"D
(3.6 x 10.9 x 11.5 cm);
ME801-C: 4"H x 0.5"W x 4.5"D
(10.2 x 1.3 x 11.5 cm)
Weight — ME801A, ME801A-E: 1.3 lb. (0.6 kg)
including power supply;
ME801-C: ~3 oz. (~85 g)

8
SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)
2. Introduction
The Short-Haul Modem-B Sync (SHM-B Sync for short)
is a synchronous full-duplex 4-wire line driver and
receiver that makes it possible for two RS-232-C devices
to communicate across distances up to 5 miles (8 km), at
data rates up to 19,200 bps. In addition to its transmitter
and receiver circuits, the SHM-B Sync also features status
LEDs, a loopback switch, and support for RS-232 clock
and control signals.
The SHM-B Sync is designed to operate with 4-wire
cable. See Appendix A for optimum cable specifications
and supported distances/data rates.
The SHM-B Sync is also designed for maximum
operator safety. There are no voltages greater than
12 VDC or 17 VAC present on the unit’s circuit board.
Opto-isolation circuits protect both the transmit and
receive lines against voltage surges (up to 20 VDC) such
as those caused by lightning.
The SHM-B Sync is available in either a 120-VAC
(ME801A) or 220-VAC (ME801A-E) standalone version
or a card version (ME801-C) that will fit in our ME810
or RM007 card chassis.

9
CHAPTER 3: Configuration
3. Configuration
Before you install a pair of SHM-B Sync units, you
should set their configuration jumpers as necessary.
CAUTION!
If you have the card version, make very sure that the
SHM-B Sync card is not installed in a powered chassis
when you configure it. If you have the standalone version,
make sure that it is unplugged and is disconnected from
any other devices. No voltages greater than 17 VAC are
ever present on the board even when it is powered, but the
possibility of electric shock should always be avoided.
When you handle the SHM-B Sync’s circuit board, take
every reasonable precaution against damaging the board
with static electricity. At the very least, discharge yourself
by touching a fixed metal surface before handling the
board; if possible, stand on an anti-static mat and wear a
grounding strap or anti-static gloves.
There are two sets of jumper posts mounted on the
SHM-B Sync’s circuit board:
• Six pairs of posts are used to set the SHM-B Sync’s
data rate. They’re at the front of the left-hand side
of the board (the ones labeled “DATA-RATE
SELECTION” in Figure 3-1). The six possible data-
rate settings are 600, 1200, 2400, 4800, 9600, and
19,200 bps. The factory-default value is 9600 bps; if
your RS-232 equipment is using one of the other
data rates, set the jumpers in both units accordingly
by moving the jumper to the appropriate pair of