Black Box RS-232 User Manual
T ranslate to and from
RS-422, RS-485, or
RS-530 for PCs and
other RS-232 devices.
Interface-powered;
plug them right into a
DB9 or DB25 RS-232
serial port.
Run at least as far as
4000 ft. (1219 m) to the
non-RS-232 device.
Non-RS-485 models
support async data
rates up to 19,200 bps.
RS-485 models support
async data rates up to
115,200 bps and as
many as 31 drops.
Some models provide
600-W surge protection.
T
he RS-422, RS-485, and RS-530
interfaces are wonderful.
Devices with these interfaces
support high speeds and very long
distances, and they communicate
very reliably. There’s just one
problem: These interfaces aren’t
native to PCs or to most of today’s
office equipment.
If you want a modular,
inexpensive, compact, and
powerful solution to this dilemma,
look no further. Our Async RS-232
Interface Converters are
designed to plug directly into the
RS-232 serial ports of PCs and
other devices, effectively turning
those ports into RS-422, RS-485, or
RS-530 ports. They don’t require
AC power or batteries; they
operate using just the small
voltage present on the RS-232
data and control leads.
The Converters come in a
variety of models with a variety of
RS-232 and non-RS-232 connectors. (See page 3 for a full listing of
which models have which types
of connectors.) But they can be
considered as three main groups:
The RS-422/530 Group
One group of models (our
product codes IC470A through
RS-232 Side
IC472A-M
DCE
DTE
Item:
Async 23
2↔422
Converter
C
od
e: IC
473A
-M
Item
: A
sync 232
↔
422 C
on
verter
Code: IC470A-M
Item:
Async 232↔422
Converter
RS-232 Side
IC471A-M
DCE
DTE
Item:
Async 23
2↔422
Converter
Key Features
ASYNC RS-232 INTERFACECONVERTERS
2/18/2000 #14096
IC473A, IC630A, and IC631A) is
designed to translate between
RS-232 and either RS-422 or the
data signals of RS-530. (These
models loop back the RS-232
control signals and can’t support
the RS-530 control signals.)
They support data rates up to
19,200bps and non-RS-232
distances up to 4000ft. (1219 m).
Some of these models have DB25
RS-232 connectors and are
DTE/DCE-switchable; other
models have DB9 RS-232
connectors and are always DCE.
The RS-422/485 Group
The second group of models
(our product codes IC476A-R2
through IC478A-R2, IC620A,
IC623A, and IC624A) is designed
to translate between RS-232 and
RS-422 and 2- or 4-wire RS-485.
These models pass through one
control signal, and can be
configured for various flowcontrol options.
They support support data
rates up to 115,200bps and nonRS-232 distances up to 9 miles
(14.5 km), but this distance will
depend on the data rate and the
type of cable you’re using. (Call
Black Box Technical Support for
assistance in determining how far
you can run in a given
application.)
These models can support as
many as 31 RS-485 drops. Like the
first group, some of these models
have DB25 RS-232 connectors
and are DTE/DCE-switchable;
other models have DB9 RS-232
connectors and are always DCE.
The RS-422/485 group of models
have built-in Silicon Avalanche
Diodes that protect against
surges up to 600watts per wire.
The 2-Wire RS-485 Group
The third group of models (our
product codes IC520A and
IC521A) is designed to translate
between RS-232 and 2-wire
RS-485 only. These models loop
back the RS-232 control signals.
They support data rates up to
115,200bps and as many as
31RS-485 drops. These models
also support non-RS-232
distances up to 4000 ft. (1219 m).
They all have DB25 RS-232
connectors but are all DCE. Like
the RS-422/485 group, they have
Silicon Avalanche Diodes for
600-watt-per-wire surge
protection.
Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support:724-746-5500 • www.blackbox.com• e-mail: info@blackbox.com
© 2000. All rights reserved.
Black Box Corporation.
Connect RS-232 to RS-422,
RS-485, or RS-530 without
wasting time, space, or money .
Cable Required:
Unconditioned twisted pair
between Converters:
IC520A and IC521A models:
2wires (1 pair);
IC476A, IC477A, IC478A,
IC620A, IC623A, and IC624A
models: 2 or 4 wires (1 or
2pairs);
IC470A through IC473A,
IC630A, and IC631A models:
4 wires (2pairs)
Compliance: CE; FCC Part 15
Subpart J Class A, IC Class/
classe A
Interfaces:
To devices: EIA/TIA RS-232C:
IC470A, IC471A, IC472A,
IC476A, IC477A, and IC478A
models: Original pinning on
DB25, DTE or DCE (userselectable);
IC520A and IC521A: Original
pinning on DB25, DCE;
IC473A, IC620A, IC623A,
IC624A, IC630A, and IC631A
models: Pinned according
to TIA-574 on DB9, DCE;
To line:
IC470A, IC473A, IC630A, and
IC631A models:
EIA/TIA RS-422;
IC471A and IC472A models:
EIA/TIA RS-422 or transmit-
and receive-data signals
of EIA/TIA RS-530;
IC476A, IC477A, IC478A, IC620A,
IC623A, and IC624A models:
2- or 4-wire EIA/TIA RS-485;
IC520A and IC521A models:
2-wire EIA/TIA RS-485
Protocol: Asynchronous
Data Format: Transparent to data
format
Software Flow Control: Transparent
to software flow control (X-ON/
X-OFF, etc.)
Hardware Flow-Control Signaling:
IC470A through IC473A, IC520A,
IC521A, IC630A, and IC631A
models: Loop back RS-232
hardware flow-control signals
(RTS, CTS, DTR, DSR, and CD);
IC476A, IC477A, IC478A, IC620A,
IC623A, and IC624A models:
Raise DSR in response to DTR;
raise CD in response to
carrier; raise CTS in response
to RTS (after no delay or 8-ms
delay, user-selectable); carrier
is either constantly ON or
controlled by RTS, userselectable
Operation:
IC520A and IC521A models: Half-
duplex only;
IC476A, IC477A, IC478A, IC620A,
IC623A, and IC624A models:
Transparent to 2-wire halfduplex or 4-wire full- or halfduplex;
IC470A through IC473A, IC630A,
and IC631A models:
Transparent to full- or halfduplex
Data Rate:
IC470A through IC473A, IC630A,
and IC631A models:
Transparent to data rates up
to 19,200 bps;
All other models: Transparent to
data rates up to 115,200 bps
Maximum Distance:
Between RS-232 device and
Converter: 50 ft. (15.2 m), but
Converters not directly
attached will be underpowered;
Between non-RS-232 device and
Converter:
IC470A through IC473A, IC520A,
IC521A, IC630A, and IC631A
models: 4000 ft. (1219 m);
IC476A, IC477A, IC478A,
IC620A, IC623A, and IC624A
models: Up to 9 miles
(14.5km) depending on data
rate and cable type
User Controls:
IC470A, IC471A, and IC472A
models: (1) DTE/DCE slide
switch;
IC476A, IC477A, and IC478A
models: (1) DTE/DCE slide
switch and (1) internal
8-position DIP switch for
configuration;
IC620A, IC623A, and IC624A
models: (2) Internal 4-position
DIP switches for configuration;
All other models: None
Indicators: None
Connectors: See Ordering
Information on the next page
Power:
From RS-232 data and control
signals (no AC power or
batteries required);
IC473A and IC620A through
IC631A models only:
Ifnecessary, 6 to 12 VDC can
be applied to Pin 9 of the DB9
RS-232 connector (call Black
Box Tech Support for details)
Surge Protection:
IC476A, IC477A, IC478A, IC520A,
IC521A, IC620A, IC623A, and
IC624A models: Internal
Silicon Avalanche Diodes
dissipate surges up to
600watts per wire within
onemillisecond;
All other models: None
Mean Time Between Failures
(MTBF):
IC470A through IC478A, IC520A,
IC521A, IC630A, and IC631A
models: Approx. 240,000hours;
IC620A, IC623A, and IC624A
models: Over 209,000 hours
Maximum Altitude:
10,000 ft. (3048m)
Temperature Tolerance:
32 to 122˚F (0 to 50˚C)
Humidity Tolerance:
5 to 95% noncondensing
Enclosure: ABS plastic
Size:
IC470A, IC471A, and IC472A
models: 2.2"H x 1.8"W x 0.8"D
(5.6 x 4.5 x 1.9 cm);
IC473A, IC620A, IC623A, IC624A,
IC630A, and IC631A models:
2.5"H x 1.2"W x 0.8"D
(6.4 x 3 x 1.9 cm);
IC476A, IC477A, IC478A, IC520A,
and IC521A models:
2.7"H x 2.1"W x 0.8"D
(6.9 x 5.3 x 1.9 cm);
Weight:
IC473A and IC620A through
IC631A models: 3oz. (85 g);
All other models: 2 oz. (57 g)
XMT A
XMT B
RCV B
RCV A
XMT A XMT A
RCV B RCV BRCV BRCV BRCV A RCV A RCV A RCV A
XMT A XMT AXMT B XMT BXMT BXMT B
MASTER SLAVE 1 SLAVE 2 SLAVE 3 SLAVE N
PC with attached
Converter
RS-422
industrial
printer
4000 ft. (1219 m) or more
Specifications
Install a Converter for straight-up
one-to-one long-distance
communication...
...or install one to
talk to a lot of
devices spread
out across a
factory floor .
RS-485 chain
EACH
ADDITIONAL
SLAVE
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