101-0010
USB to 2-Wire RS-485 Converter
Installation
Operation &
Specifications
Manual
General Description
The 101-0010 USB to RS-485 Converter provides a simple, low cost interface
between a PC or laptop with a USB port, and 2-wire RS-485 devices. Universal
Serial Bus (USB) drivers make this converter compatible with most software
developed for RS-232 serial port interfaces because it appears as an RS-232
port to your software. Switching between receive and transmit is automatically
controlled, RTS (request to send) is not used to control transmit. Power for the
converter is taken from the USB port so no external power supply is required.
A rugged design makes 101-0010 an ideal choice for fi eld engineers and tech-
nicians who service RS-485 2-wire equipment in an industrial environment.
Because the 101-0010 RS-485 converter is used on devices without a ground
terminal, voltage suppression is used to clamp the common mode voltage to +/7 volts to help prevent destruction of the converter.
For an RS-485 converter with a RS-232 interface Microfl ex offers the 101-0009.
620-0005 R1.b © Microfl ex 2007-2012
Driver Installation - 7, Vista, XP, and 2000
The USB drivers should be installed before the RS-485 converter is connected to
the PC’s USB port. After the drivers are installed, Windows will automatically
detect the converter when it is connected to a USB port and complete the setup.
To pre-install the drivers, run setup.exe from the included CD and follow the onscreen prompts. The CD will auto-run this fi le if the Windows auto-run feature
is enabled for your CD drive and the setup.exe application will determine your
operating system so that the correct installer can be used.
Install RS-485 Converter USB
Click
drivers... to run the driver installer
wizard.
After the drivers are installed, connect your converter to a USB port to
complete the installation.
Windows will assign a COM port
number to your converter. You will
need to know the assigned number
so that the software you use with
your converter can be set to use the
same port number. Click Find my
Converter’s COM port number...
display a list of connected devices
and their assigned port numbers.
to
Installers can be run manually. For 32 bit operating systems browse to the
x86 folder on the CD and run the DPInst.exe application. For 64 bit operating
systems browse to the x64 folder on the CD and run the DPInst.exe application.
You may need administrative privileges to run the driver installer. If so log-in
as an administrator and right click on the DPInst.exe fi le in Windows Explorer.
Select “Run as administrator”.
The USB drivers are Microsoft certifi ed and are available on the Microsoft
Driver Distribution Center web site. The fi les can be automatically installed
without the CD if your computer is connected to the internet and you select to
search the web for the latest driver version.
2
Changing the COM Port Number
The assigned serial COM port number can be changed to any available COM
port by using the Device Manager. Open the Device Manager and select “View
> Devices by Type”. Expand “Ports (COM & LPT)” in the list to see which port
the USB RS485 Serial Converter is assigned to. In the example shown below,
the converter is assigned to COM3.
Right click on USB RS485 Serial Converter and select Properties from the popup menu.
On the Port Settings tab, click “Advanced”. Drop down the “COM Port Number” list and select the desired port number. Click “OK” to use the new port
number and close the window.
Click “OK” again to close the Properties window.
3
Uninstalling USB Drivers
For Windows 7, Vista, XP, and 2000 - use the Device Manager to uninstall the
driver from your system. With the RS-485 Converter connected to your USB
port, locate the RS-485 converter in the hardware tree. For details on how to do
this refer to the section on “Changing the COM Port Number” in this manual.
Right click on USB RS485 Serial Converter and select “Uninstall” from the popup menu. When the process has fi nished, unplug the converter from the USB
port.
For Windows 98 and ME, always us the Add/Remove Programs utility to
remove the converter drivers as this uses the uninstaller program to remove the
fi les and registry entries to leave a clean system. Other methods may leave fragments of the driver that may interfere with future installations.
Step 1: Disconnect any converters that are attached to the PC.
Step 2: Open the Add/Remove Programs utility located in “Control Panel\Add/
Remove Programs”.
Step 3: Select “Microfl ex USB Converter Drivers” from the list of installed
programs.
Step 4: Click “Change/Remove” button. This will run the uninstaller program.
Click “Continue” to run the uninstaller or “Cancel” to exit.
Step 5: When the uninstaller has fi nished removing the device from the system,
the caption on the “Cancel” button will change to “Finish”.
Click “Finish” to complete the process.
4
Software Setup
Make sure your software is set to use the same serial COM port that the RS-485
is confi gured to. Refer to Changing the COM Port Number in this manual for
details. There are no hardware settings required by the RS-485 Converter. Power
is provided by the USB port. All other settings, such as BAUD rate, are taken
care of by your software. The converter automatically switches between transmit and receive so RTS is not required.
Connecting to the RS-485 Device
Connect the two mini-clips to the RS-485 bus. Following the RS-485 standards,
the black clip is the A connection and the red clip is the B connection.
• BLACK = A RS-485 Connection
• RED = B RS-485 Connection
Converter Grounding
The 101-0010 converter does not provide an RS-485 ground terminal. Unless
the other device’s interface is isolated, there is a risk of a ground loop current
that could result in equipment damage. The converter should only be used where
the common mode voltage (ground potential difference between the two interfaces) is within the standard RS-485 common mode voltage of +/- 7 volts.
5
Safety Considerations
Conformity in accordance with Part 2, and Part 15, Subparts A and B of
the Federal Communications Rules and Regulations, and ICES-003 of the
Industry Canada standards.
This device complies with part 15 of the FCC rules. Operation is subject
to the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation. Changes or
modifications not expressly approved by Microflex, LLC could void the
user’s authority to operate this equipment.
Emissions EN55022: 1998
Electrostatic Discharge EN61000-4-2: 1995, A1: 1998, A2: 2001
Radiated Immunity EN 61000-4-3: 2002
Safety Compliance EN 60950-1: 2002
This device does not have protection from over-voltages which may exist
on USB ports of computers and relies on the protection existing in a host
computer.
This device is not intended for connection to the phone line through the
appropriate converters and shall not be connected to telecommunication
lines because it has no protection against over-voltages which may exist in
these lines.
The user shall ensure the protection of the operator from access to areas
with hazardous voltages or hazardous energy in their equipment.
The user shall ensure that the connection port of the field device and the
converter is separated at least by basic insulation from any primary circuit
existing in the field device.
6
Specifications
Enclosure
Molded Buna-N 90 Durometer Rubber with
Stainless Steel Cover
Weight .................................................................................................5 ounces
Converter Dimensions ......................................................1.75” x 2.375” x 0.5”
USB
Connector .............................................................................................. USB-A
Cable Length ............................................................................................ 6 feet
Compatibility .................................................................. USB 1.1 and USB 2.0
Active Current .................................................................................. 30mA Max
Suspend Current ........................................................ Less than 600μA Typical
RS-485
Termination ...................................................... Pamona Electronics Mini-Clips
A = Black Clip
B = Red Clip
Leads .....................................................1 Foot High Flexibility Test Lead Wire
Max BAUD Rate ........................................................................... 115,200 BPS
Driver Output Voltage ................................................................... Unloaded 5V
@ 27Ω Load 1.5V Min
Δ Input Threshold Receive Voltage ...................................................... +/- 0.2V
Receiver Input Hysteresis ............................................................... 45 mV Typ.
Receiver Input Current ..................................................................+/- 1mA Max
Surge Protection ......................................... 600W Silicone Avalanche Diodes
• Does not include RS-485 termination resistor
• Auto transmit control
• Supports up to 32 Transceivers on the Bus
• Power Up/Down glitch-free permits live insertion or removal
• Common mode range permits +/-7V ground difference
Environmental
Operating Temperature ...................................... -20ºC to 50ºC (-4ºF to 122ºF)
Storage Temperature ....................................... -40ºC to 85ºC (-40ºF to 185ºF)
Humidity ................................................................. 0 to 99% (non-condensing)
7
Limited Warranty
Microfl ex, LLC warrants this unit against defects in materials and workmanship for a
period of one year from the date of shipment. Microfl ex, LLC will, at its option, repair or
replace equipment that proves to be defective during the warranty period. This warranty
includes parts and labor.
A Return Materials Authorization (RMA) number must be obtained from the factory
and clearly marked on the outside of the package before equipment will be accepted for
warranty work.
Microfl ex, LLC believes that the information in this manual is accurate. In the event that
a typographical or technical error exist, Microfl ex, LLC reserves the right to make changes
without prior notice to holders of this edition. The reader should consult Microfl ex, LLC
if any errors are suspected. In no event should Microfl ex, LLC be liable for any damages
arising out of or related to this document or the information contained in it.
EXCEPT AS SPECIFIED HEREIN, MICROFLEX, LLC MAKES NO W ARRANTIES OR
MERCHANT ABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CUSTOMER’S
RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE
PART OF MICROFLEX SHALL BE LIMITED TO THE AMOUNT THERETOFORE
PAID BY THE CUSTOMER. MICROFLEX, LLC WILL NOT BE LIABLE FOR
DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS,
OR INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE
POSSIBILITIES THEREOF. This limitation of the liability of Microfl ex, LLC will apply
regardless of the form of action, whether in contract or tort, including negligence. Any
action against Microfl ex, LLC must be brought within one year after the cause of action
accrues. The warranty provided herein does not cover damages, defects, malfunctions, or
service failures caused by owners failure to follow Microfl ex, LLC’s installation, operation,
or maintenance instructions; owners modifi cation of the product; owner’s abuse, misuse, or
negligent acts; and power failure or surges, fi re, fl ood, accident, actions of third parties, or
other events outside reasonable control.
Microfl ex, LLC
2202 Red Bird Lane
Brookshire, Texas 77423
USA
The HART protocol is supported by the HART Communications Foundation in Austin Texas,
www.hartcomm.org. HART is a registered trademark of the HART Communications Foundation.
Phone 281-855-9639
Fax 832-422-4391
www.microfl x.com
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