Black Box LD485S-MP User manual
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INFORMATION
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AUGUST 1999
ME742A-R3
ME742C-R3
BC00703
FA520A-R2
RS-232/RS-485 Synchronous
Multipoint Line Driver (LD485S-MP)
LD485S-MP
RTS CD TD RD PWR
DLB LLB TEST
1
TRADEMARKS
TRADEMARKS USED IN THIS MANUAL
Any trademarks used in this manual are acknowledged to be the property of the
trademark owners.
2
LD485S-MP
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
NOM STATEMENT
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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LD485S-MP
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
CONTENTS
Contents
Section Page
1. Specifications ..........................................................................................................6
2. Introduction ............................................................................................................9
2.1 Application ..................................................................................................10
2.2 Front-Panel Indicators and Buttons............................................................11
2.3 Back-Panel Connectors................................................................................12
3. Configuration ........................................................................................................13
3.1 Switches ........................................................................................................15
3.1.1 Baud Rate ..............................................................................................15
3.1.2 Transmit Data Clock ............................................................................16
3.1.3 Node Termination (Switch 7) ............................................................17
3.2 Jumpers ........................................................................................................17
3.2.1 Constant Carriers or Switched Modes ................................................17
3.2.2 RTS/CTS Delay ....................................................................................18
3.2.3 Full or Half-Duplex Operation ............................................................19
3.2.4 Tying Signal Ground to Frame Ground..............................................19
4. Installation ............................................................................................................20
5. Test Modes ............................................................................................................21
6
LD485S-MP
1. Specifications
Terminal Interface — EIA RS-232-C (CCITT V.24/V.28) configured as DCE
serial synchronous internal/external/recovered TX data
clock
Line Interface — EIA RS-485 twisted pair (26 AWG minimum), DC
continuity required
Data Rates — 1200, 2400, 4800, 9600, 19,200, 38,400, 56,000, 64,000,
112,000, or 128,000 bps
Operating Modes — 2-wire half duplex, 4-wire full or half duplex; point-to-
point or multipoint; normal or line/digital loopback;
Constant Carrier or Switched Mode
Pins Supported — RS-232-C: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 17, 20, 24; RS-485:
TX A, TX B, RX A, RX B
RTS/CTS Delay — 0, 11, 50, or 160 ms
Connectors — (1) DB25 female, (1) 4-screw terminal block
Indicators — 5 LEDs: TX, RX, RTS, CD, PWR
MTBF — 100,000 hours (approximately)
Operating
Temperature — 32 to 122°F (0 to 50°C)
Storage
Temperature — -4 to +158°F (-20 to +70°C)
Humidity — 15 to 90% relative humidity, non-condensing
Power — Wallmount transformer, 115 VAC/100 mA or
230 VAC/50 mA
Size — Standalone: 1.8"H x 5.5"W x 8.5"D (4.5 x 13.9 x 21.5 cm);
Rackmount: 4.7"W x 7.4"D (11.9 x 18.8 cm)
Weight — Standalone, unit only: 1 lb. (0.45 kg); Standalone,
including transformer: 1.5 lb. (0.68 kg); Rackmount:
0.5 lb. (0.23 kg)
7
CHAPTER 1: Specifications
Transmission
Distance — (4-wire point-to-point, 26-AWG twisted pair)
Speed (bps) Distance
1200 4 miles (6.4 km)
2400 3 miles (4.8 km)
4800 2.3 miles (3.68 km)
9600 1.7 miles (2.72 km)
19,200 1.2 miles (1.92 km)
38,400 0.9 mile (1.44 km)
56,000 0.8 mile (1.28 km)
64,000 0.75 mile (1.2 km)
112,000 0.55 mile (0.88 km)
128,000 0.35 mile (0.56 km)
Interface Pinouts —
RS-485
Pin Name
TX A
TX B Transmit Data Pair
RX A
RX B Receive Data Pair
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LD485S-MP
RS-232-C
Pin Name
1 Protective Ground (FG)
2 Transmit Data (TD)
3 Receive Data (RD)
4 Request To Send (RTS)
5 Clear To Send (CTS)
6 Data Set Ready (DSR)
7 Signal Ground (SG)
8 Receive Line Signal Detector (CD)
9 Aux + power (+12V through 560 ohms)
10 Aux - power (-12V through 560 ohms)
15 Transmitter Signal Element Timing (TC)
17 Receiver Signal Element Timing (RC)
20 Data Terminal Ready (DTR)
24 DTE Transmitter Signal Element Timing
9
CHAPTER 2: Introduction
2. Introduction
The RS-232 Synchronous Multipoint Line Driver provides short-haul synchronous
data communication over customer-owned twisted-pair cable. It’s available as a
standalone unit (Part Number ME742A-R3) or a rackmount card (Part Number
ME742C-R3). The rackmount version is functionally identical to the standalone
unit, but it fits in a rackmount chassis that holds up to 16 cards. Each Line Driver
comes with a 6-ft. DB25 male to DB25 male RS-232 extension cable and a DB9
female to DB25 male adapter.
The LD485S has an RS-232 port (configured as DCE) that connects to a host
computer or terminal (DTE), and a 4-screw terminal block for RS-485
communication over a 2- or 4-wire line. Transmission can be two-wire half duplex,
or four-wire half/full duplex. There are a variety of switch-selectable baud rates
ranging from 1200 to 128,000 bps.
A group of LEDs on the unit’s front panel indicate flow-control status (TX, RX,
RTS, CD). Three pushbuttons on the front panel are used to perform line and
digital loopback testing. A number of options are configurable via internal switches
or jumpers:
• Data rate
• Constant Carrier/Switched Mode with selectable RTS/CTS delay
• Full/half duplex
• TX data clock select
• Node termination
• Frame ground/signal ground
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