Black Box IC476A-F-R2 User manual

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FEBRUARY 1998
IC476A-F-R2 IC477A-M-R2
IC476A-M-R2 IC478A-F-R2
IC477A-F-R2 IC478A-M-R2
Async 232↔422/485 Converter
Code: IC478A-M-R2
Item:
Async 232↔485
Converter
S/N:
Code: IC477A-M-R2
Item:
Async 232↔485
Converter
S/N:
Code: IC476A-M-R2
Item:
Async 232↔485
Converter
S/N:

1
ASYNC 232↔422/485 CONVERTER
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 the Canadian
Department of Communications.
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 le ministère des
Communications du Canada.
CE NOTICE
The CE symbol on your Async 232 ↔ 422/485 Converter indicates that it is
in compliance with the Electromagnetic Compatibility (EMC) directive and
the Low Voltage Directive (LVD) of the Union European (EU).
TRADEMARKS USED IN THIS MANUAL
All applied-for and registered trademarks are the property of their
respective owners.

2
ASYNC 232↔422/485 CONVERTER
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 parato 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 .

3
ASYNC 232↔422/485 CONVERTER
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 equio 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
ASYNC 232↔422/485 CONVERTER
Contents
1. Specifications ...............................................................................................5
2. Introduction................................................................................................7
3. Configuration..............................................................................................8
3.1 Setting the DTE/DCE Switch................................................................9
3.2 DIP-Switch Configuration ..................................................................10
3.2.1 DIP-Switch Settings ..................................................................11
3.2.2 Configuration Switch Applications...........................................13
3.2.3 When You’re Finished Configuring.........................................13
4. Installation.................................................................................................14
4.1 Connection to the RS-485 Interface...................................................14
4.1.1 4-Wire Connection Using the DB25 (IC477A or 78A-X-R2) ..14
4.1.2 4-Wire Connection Using Terminal Blocks (IC476A-X-R2) ...15
4.1.3 2-Wire Connection....................................................................18
4.2 Connection to the RS-232 Interface...................................................19
4.3 Wiring for Multipoint Applications....................................................19
4.4 Operation............................................................................................20
Appendix A. RS-232C Pin Configurations ..................................................21
Appendix B. 422/485 (530) Pin Configuration ...........................................22
Appendix C. Self-Test..................................................................................23

5
Data Rate Up to 115,200 bps
Connectors IC476A-F-R2: (1) Female DB25,
(1) Terminal block; IC476A-M-R2:
(1) Male DB25, (1) Terminal block;
IC477A-F-R2: (2) Female DB25s;
IC477A-M-R2: (1) Female DB25,
(1) Male DB25; IC478A-F-R2: (1) Male
DB25, (1) Female DB25;
IC478A-M-R2: (2) Male DB25s
Transmission Format Asynchronous
Transmission Line 2- or 4-wire unconditioned,
unshielded, solid-copper-core twisted
pair
Transmission Mode 4-wire, full or half-duplex; 2-wire half-
duplex
Range Up to 9 miles (14.5 km) depending on
baud rate and type of cable
Control Signals DSR turns “ON” immediately after the
terminal raises DTR; DCD turns “ON”
after recognizing the receive signal
input on the RS-422 interface; CTS
turns “ON” after the terminal raises
RTS
Carrier Strap-selected, either continuous or
switched operation, controlled by RTS
Surge Protection 600 watts power dissipation at 1 msec.
RTS/CTS Delay 8 msec. or “no delay”
MTBF 239,906 hours
Operating Temperature 32° to 122°F (0° to 50°C)
CHAPTER 1: Specifications
1. Specifications

6
ASYNC 232↔422/485 CONVERTER
Humidity 5 to 95%, noncondensing
Altitude Up to 10,000 feet (3048 m)
Power Draws operating power from RS-232
data and control signals; no AC power
or batteries required
Size 2.7"H x 2.1"W x 0.7"D (6.9 x 5.3 x
1.8 cm)
Shipping Weight <1 lb. (<0.5 kg)

7
CHAPTER 2: Introduction
The Async 232 ↔ 422/485 Converter provides exceptional versatility in a
compact package. Requiring no AC power or batteries for operation, the
Converter supports asynchronous data rates up to 115.2 Kbps over one or
two unconditioned unshielded, solid-copper-core twisted pair.
The Converter passes one control signal in each direction (see explanation
in Section 4.4 ) and can handle up to 31 terminal drops in a multipoint
polling environment. The Converter may be configured for high- or low-
impedance operation, carrier may be set to “constantly on” or “controlled
by RTS,” and the unit can operate with or without echo (half-duplex
mode). RTS/CTS delay may be set for “no delay” or 8 milliseconds.
The Converters can be ordered with either male or female DB25
connectors for RS-232. For RS-485/530 connections, you can order either
terminal block with strain relief or DB25 male or female (depending on the
model). Silicon Avalanche Diodes provide 600 watts per wire of protection
against harmful data-line transient surges.
2. Introduction

8
ASYNC 232↔422/485 CONVERTER
The Async 232 ↔ 422/485 Converter is configured using an eight-position
DIP switch and a DTE/DCE switch. The figure below shows the DTE/DCE
switch location, along with the location of the terminal block.
The illustration at the top of the next page shows the location of the eight-
position DIP switch on the underside of the Converter’s PC board.
DCE DTE
+RCV-G-XMT+
3. Configuration
DTE/DCE Switch
Terminal Block

9
3.1 Setting the DTE/DCE Switch
For your convenience, the IC476A-X-R2 Converter has an externally
accessible DTE/DCE switch (see the diagram on the previous page). To
access the DTE/DCE switch on the IC477A-X-R2 and IC478A-X-R2,
remove the plastic shells as illustrated on the next page.
If the device connected to the Converter is a modem or multiplexor (or is
wired like one), set the switch to “DTE.” The setting causes the Converter to
behave like Data Terminal Equipment and transmit data on pin 2.
If the device connected to the Converter is a PC, terminal, or host
computer (or is wired like one), set the switch to “DCE.” This setting causes
the Converter to behave like Data Communications Equipment and
transmit data on pin 3.
ON
1 2 3 4 5 6 7 8
CHAPTER 3: Configuration
DIP Switch S1