February 2010
MT1000A-85-R4
USB to RS-485 Mini Converter
Connect RS-485 devices to your USB port.
Just plug the converter into an available USB port on your computer or USB
hub and install the drivers (supplied on CD-ROM).
IC832A
IC833A
1. Specifications
Data Rate — USB: 12 Mbps;
Serial: Up to 921.6 kbps
MTBF — 1,869,313 hours
MTBF Method — Parts count reliability prediction
Software — Drivers included for Windows 98, Me, 2000,
and XP; and Windows Vista
Terminal Block Signals — RS-485 2-Wire: Data A(-),
Data B(+), Ground;
RS-485 4-Wire: TDA (-), TDB(+), RDA(-), RDB(+), Ground
Connector — USB: Type B female (high-retention);
Serial: Removable terminal block (28 to 16 AWG)
Standard — USB 2.0, backward compatible
Temperature Tolerance — Operating: 32 to 158° F
(0 to 70° C);
Storage: -40 to +185° F (-40 to +85° C)
Operating Humidity — 0 to 95%, noncondensing
Power — Source: USB port; Input Voltage: 5 VDC;
Consumption: Approximately 0.5 W (low-power device
draws less than 100 mA)
Size — 2.6"H x 1.3"W x 0.6"D (6.5 x 3.2 x 1.6 cm)
Weight — 0.23 lb. (104.3 g) with USB cable
2. Overview
2.1 Description
Universal Serial Bus (USB) has become the connectivity workhorse of today’s PCs, replacing the familiar serial ports.
However, many commercial and industrial devices still use the
RS-485 interface. To connect these devices to modern PCs, you
need a simple and reliable conversion solution. The IC832A and
IC833A offer this solution in a space-saving, USB-port-powered
package. Simply plug the converter into an available USB port
on your computer or USB hub and install the drivers supplied
on CD-ROM. The device will show up as an additional COM
port in the Windows Device Manager, which is fully compatible
with your Windows applications. A 3.2-ft. (1-m) USB cable is
included.
2.2 Features
• Connect RS-485 devices to your USB port.
• Perfect for field service applications.
• Small—fits easily into any laptop bag.
• USB port powered.
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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
Web site: w ww.blackbox.com • E-mail : info@blackbox.com
USB to RS-485 Mini Converter
• USB 2.0 (12 Mbps) compatible.
• Supports RS-485 data rates up to 921.6 kbps.
• Has a removable terminal block for easy wiring.
• High-retention USB connector.
• Supports Windows® 98, Me, 2000, XP; and Windows Vista®.
2.3 What’s Included
• IC832A or IC833A USB to RS-485 Mini Converter.
• 3.2-ft. (1-m) USB Cable.
• This user manual and CD with drivers for Windows 98, Me,
2000, and XP; and Windows Vista.
3. Installation
3.1 Terminal Block
Table 1. Terminal block pinning.
IC832A IC833A
Position Signal Position Signal
A(-) Data A(-) TDA(-) Transmit Data A (-)
B(+) Data B(+) TDB(+) Transmit Data ( B+)
A(-) Data A(-) RDA( -) Receive Data (A-)
B(+) Data B(+) RDB(+) Receive Data ( B+)
GND Ground GNC Ground
3.2 Driver Installation
NOTE: Screen shots are from Windows XP.
THE FOUND NEW HARDWARE WIZARD WILL RUN TWICE:
ONCE TO INSTALL THE USB DEVICE AND ONCE TO INSTALL
THE SERIAL COM PORT.
4. Select “Install the software automatically” and click
“Nex t >.”
Figure 2. Insert software disk.
5. A warning concerning Windows logo testing will be
displayed. Click on “Continue Anyway >. ”
Figure 3. Hardware Installation screen.
6. The Completing the Found New Hardware Wizard will be
displayed. Click on “Finish >.”
THE FOUND NEW HARDWARE WIZARD WILL RUN TWICE:
ONCE TO INSTALL THE USB DEVICE AND ONCE TO INSTALL
THE SERIAL COM PORT.
1. Connect the converter to your PCs USB port with the
supplied cable.
2. The “Found New Hardware” wizard will start.
3. When prompted to connect to Windows Update to search
for the driver, select “No, not at this time” and click on
“Nex t >.”
Figure 1. Found New Hardware Wizard welcome screen.
Page 2
Figure 4. Completing the Found New Hardware Wizard screen.
3.3 Check Drivers
NOTE: Screen shots are from Windows XP.
1. Right click on “My Computer.” Select the “Hardware” tab.
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Figure 5. Hardware tab.
2. Expand the Ports (COM & LPT) tree. The USB Serial Port will
be listed as the next available COM Port.
USB to RS-485 Mini Converter
3.4 Installation Notes
• When the driver is installed, the converter is associated to
that PC. If you plug in a different converter, the driver must
be installed again. Another COM port will also be created
with the driver installation.
• Instructions for uninstalling the driver are located on the
CD-ROM.
3.5 IC832A Wiring
Figure 8. IC832A wiring diagram #1.
FIgure 6. Expand the COM and LPT ports.
3. Expand the USB Controllers tree. The USB Serial Converter
will be listed.
Figure 7. USB Controllers Tree screen.
Figure 9. IC832A Wiring diagram #2.
NOTE: This converter is used for RS-485 2-wire systems.
1. Loosen the screws to open the terminal block lead clamps
for the A(-), B(+), and GND terminals.
2. Insert the RS-485 2-wire signal leads in accordance with the
diagram above. The terminal block will accept 28 to 16 AWG
wire.
3. Tighten the screws to close the terminal block lead clamps.
Make sure the clamps hold the leads securely, but do not
overtighten.
NOTE: Bias is provided by 4.7 K-Ohm pull-up and pull-down
resistors.
4. If termination is required, it must be installed externally. In
most cases, termination is not required.
5. During operation, the receiver toggles with the transmit
data.
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Page 3
3.6 IC833A Wiring
Figure 10. IC833A wiring diagram #1.
Figure 11. IC833A wiring diagram #2.
This converter is used for RS-485 4-wire systems.
5. During operation, the receiver is always active.
3.7 IC832A Loopback Test
Figure 12. Loopback test for IC832A.
1. Loop back TDA(-) to RDA(-) and TDB(+) to RDB(+) as shown
in the diagram above.
2. Using Hyperterminal® or a similar program, connect to the
appropriate COM port. Set the desired baud rate. Ensure
Hyperterminal local echo is OFF.
3. Transmit data. If the same character string is returned, the
test is good.
3.8 IC832A Back-to-Back Test
1. Loosen the screws to open the terminal block lead clamps
for the TDA(-), TDB(+), RDA(-), RDB(+), and GND terminals.
2. Insert the RS-485 4-wire signal leads in accordance with the
diagram above. The terminal block will accept 28 to 16 AWG
wire.
3. Tighten the screws to close the terminal block lead clamps.
Make sure the clamps hold the leads securely, but do not
overtighten.
NOTE: Bias is provided by 4.7 K-Ohm pull-up and pull-down
resistors.
4. If termination is required, it must be installed externally. In
most cases, termination is not required.
1. Wire the converters as shown above.
2. Using Hyperterminal or a similar program, connect to the
appropriate COM ports. Set the desired baud rate.
3. Transmit data. If the same string is received on the distant
Figure 13. Back-to-back test for IC832A.
end, the test is good.
© Copyright 2012. Black Box Corporation. All rights reserved. Printed in U.S.A. Black Box® and the Double Diamond logo are registered trademarks of BB Technologies, Inc. Windows and
Windows Vista are registered trademarks of Microsoft Corporation. Hyperterminal is a registered trademark of Hilgraeve, Inc. Any third-party trademarks appearing in this manual are
acknowledged to be the property of their respective owners.
IC832A, version 2
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