ONTRAK ADU71 User manual

ADU71 USB to Current Output
( 4-20mA, 0-20mA Transmitter )
User Manual
Ver 1.2
www.ontrak.net

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EU Declaration of Conformity
We, the undersigned,
Manufacturer:
Ontrak Control Systems Inc.
Address, City
1545 Maley Drive, Unit 3 , Sudbury
Province, Country, Postal Code
Ontario CANADA P3A4R7
Phone and FAX
[phone] [phone] ( FAX)
Email Address
[email protected]
certify and declare under our sole responsibility that the following Apparatus:
Model No: ADU71
SN: H10000 and higher.
Description:
USB to Current Output Interface
Brand:
Ontrak Control Systems Inc.
Conforms with the essential requirements of the EMC Directive 2004/108/EC, via Annex II, based on
the following specifications applied:
RF Emissions
EN55011:2009/A1:2010 Class B
ESD Immunity
IEC 61000-4-2:2008 Level 2 Criterion B
RF Immunity
IEC 61000-4-3:2006 +A1:2007 +A2:2010 Level 2 Criterion B
And therefore complies with the essential requirements and provisions of the EMC directive.
The technical documentation is kept at the following address:
Company:
Ontrak Control Systems Inc.
Address, City
764 Notre Dame Ave, Unit 1, Sudbury
Country, Postal Code
Canada P3A 2T2
Phone Number
[phone]
Fax, Email
[phone] [email protected]et
Name of Person binding the
manufacturer.
Tom Fortin- Director
Ontrak Control Systems Inc
Oct 29, 2013
Sudbury , Ontario, CANADA

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Table Of Contents
1. What is Included and Where to Start 4
2. ADU71 Features 4
3. The ADU71 STATUS LED 5
4. AduHidTest USB Device Test Program 6
5. ADU71 Command Summary 10
6. ADU71 Command Descriptions 11
6a) Setting Range and Output Current 11
6b) Reading Output Current 11
6c) Setting the Slew Rate 12
6d) Using the Watchdog Feature 12
6e) Using the Status Feature 13
6f ) The ADU71 Reset Command 13
7. The ADU71 Connection Diagrams 14
7a) Connecting to Current Input Devices 14
7b) Connecting to Voltage Input Devices 15
8. Specifications and Dimensions 17

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1. What is Included and Where to Start
The ADU71 ships complete with a 10' USB cable, and this User Manual.
A complete SDK including DLL, programming language examples, and AduHidtest software is available at:
http://www.ontrak.net/programming.htm
First time users should first review the ASCII command set for the ADU71 and then use AduHidTest USB test
software to become familiar with the operation of the various features of the product.
Note: The AduHid DLL requires one of the following Windows operating systems. 98SE, 2000, XP, Vista, Windows
7, Windows 8. The programming section of the web site also contains examples for use with various other
operating systems and provides details that allow use of the ADU71 without using the Windows based AduHid DLL
2. ADU71 Features
•Provides a standard powered current loop output of 4-20mA or 0-20mA.
•Drives 4-20mA, 0-20mA devices or 1-5VDC, 0-5VDC or 0-10VDC inputs using external resistors.
•Ideal for controlling variable frequency drives ( VFD ), valves etc.
•Internal isolated 24VDC supply derived from USB bus. No need for external loop power supply.
•Programmable slew rate from 1ms to 10 seconds.
•Programmable host watchdog function.
•Loop error detection.
•Over temperature detection
•2500V Isolation to loop.
•Bus Powered
•High retention USB Connector
•CE Marked
•Bi-colour LED status indicator.
•High quality cage-clamp type terminal blocks.
•Uses standard HID drivers included with Windows 98SE, 2000, XP, 7, 8 32-bit or 64-bit
•Mini-driver ( DLL ) provided for use with VB,VC, .NET, LabVIEW and TestPoint and others.
•Meets IEC61000-4-2 ESD protection for USB port.
•Available in flange ( standard ) or DIN rail mount.

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3. The ADU71 STATUS LED
The ADU71 STATUS LED is a bi-colour ( Red/Green) led indicator used to identify the current status of the ADU71
USB connection.
The LED modes are;
RED -ADU71 powered but not enumerated.
GREEN -ADU71 powered and enumerated by host computer.
OFF -ADU71 disconnected from USB bus OR host computer has entered SLEEP mode.
The ADU71 can be connected to the USB bus via the enclosed 10' A-B USB cable. The cable provides both power
and communications connections to the ADU71. When first connected, the STATUS led will turn RED indicating
power is applied. For Windows operating systems, a message may flash on the screen indicating;
New hardware Found
ADU71 USB to Current Output Interface
Depending on the version of Windows, the host may prompt to search for a driver. Select,
Let Windows Search for a Driver
and click next.
After a few seconds, the STATUS led will turn green indicating enumeration is complete. The enumeration
process is completely transparent to the application program as the ADU71 is a USB HID class device. Enumeration
is completed by the Windows ( or other ) operating system standard USB HID drivers.
The ADU71 can be connected directly to the host hub or externally powered hubs.
Caution: ( Use of System Sleep ): If the Windows ( or other ) operating system allows the host computer to enter
sleep mode, attached USB devices will be set to suspend mode. In this mode the power draw of the ADU71 drops
to less than 2.5mA ( USB2.0 Specification ) and the current loop output is put into high impedance mode. In
suspend mode the ADU71 Status LED is turned off. Once the host computer is revived from sleep mode, the
ADU71 status LED will turn to green and the output will have to be re-enabled by the host application. Ensure
system power settings are set such that the host computer does not enter sleep mode during normal operation.

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4. AduHidTest USB Device Test Program
AduHidTest is a Windows based USB device test program used to test the connection of ADU data acquisition
devices to a USB port. The program is also a useful tool to allow programmers to become familiar with the ADU71
command set. AduHidTest software can be downloaded from the Ontrak website at:
http://www.ontrak.net/programming.htm . Note that the program requires the AduHid.dll to operate and it
should be copied to the dame directory as the AduHidTest.exe file.
Getting Started:
There are three steps in using a USB device in any application software. The three steps are;
1. Obtain a handle for the USB device.
2. Send commands to the USB device.
3. Receive data from the USB device.
STEP 1: Obtain a handle for the ADU71
A handle is a unique code that application software uses to identify a USB device for the purpose of reading and
writing to the device. A USB bus can have up to 128 devices connected to a single host and there are three
criteria that can be used to open a handle. The three criteria are, Vendor ID, Product ID and Serial Number. If a
single device is connected to the bus, any of the three criteria may be used. If multiple devices are connected,
we recommend using the Serial Number to open the handle.
( All ADU devices have their unique serial number printed on the top label )
When run, the AduHidtest Software will display the following window.
Figure 1: AduHidTest Software Window

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The Open/Close section of the window is where the handle is determined. Click on the Show List button to view
the devices connected to the USB bus. ( Note: Only ADU devices will be listed ) Figure 2 is the window that appears
when the Show List Button is clicked.
Figure 2: ShowList Window
The window indicates that there is one ADU71 connected with serial number T10002. Select the device by double
clicking on the text “ ADU71 serial number = T10002”. The AduHidTest main window will now display the
product ID and Serial number. Click the By Serial # radio button and then click Open to open the handle to the
selected ADU71.
Figure 3: Handle Open to ADU71

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STEP 2: Sending Commands to the ADU71
Once connected, you may now send commands to the available "pipes" on the ADU71 device. Pipes are the
individual connections to functional sections of the ADU71 . The Device Pipe is used to send standard ASCII ADU
commands to control the peripherals built into the ADU71 such as the current loop output or the watchdog timer.
The ADU71 does not use the RS232 or Stream pipes. Type "wr65535" ( Enable loop in 0-20mA mode and set
current to 20mA) into the device pipe send window and click Send ADU . An OK will appear beside the Send ADU
button if successful and the ADU71 will begin sourcing 20mA at its Loop output terminals. Note that ADU
commands are not case sensitive.
Figure 4: Sending "wr65535" Command

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STEP 3: Receiving Data from the ADU71
Some commands will cause a response to be sent from the ADU71 back to the host computer. For example, if an
"rd" ( read output current setting ) command is sent, the ADU71 will send back the 5 digit value of the present
output current setting. To read responsive commands, simply click the Receive ADU button and the data will be
displayed.
Figure 5: Sending "rd" Command
Figure 6: Receiving Data
These procedures can be repeated using the various commands available on the ADU71. The AduHidTest software
is an invaluable tool to allow programmers to become familiar with any ADU product.

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5. ADU71 Command Summary
WRnnnnn Sets output current to nnnnn and sets range to 0-20mA
( nnnnn = 00000 to 65535 )
WLnnnnn Sets output current to nnnnn and sets range to 4-20mA
( nnnnn = 00000 to 65535 )
RD Returns present current output setting.
SRn Sets slew rate to desired rate. ( n = 0 to 7 )
0 - 1ms
1 - 10ms ( Default or power-up setting )
2 - 50ms
3 - 100ms
4 - 500ms
5 - 1s
6 - 5s
7 - 10s
WDn Sets watchdog. ( n = 0 to 4 )
0 - OFF ( Default or power-up setting )
1 - 100ms
2 - 1s
3 - 5s
4 - 10s
STA Returns present status.
0 - Loop Output Disabled ( Default or power-up setting )
1 - Loop Enabled ( No fault )
2 - Slew Active ( The output is presently slewing )
3 - Loop is OPEN ( Fault condition )
4 - Over Temperature (ADU71 core above 150C )
RST Resets ADU71 to power-on ( default ) condition.