Introducing Message-Based DAQ

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Programming and developing applications You can access DAQFlex series hardware functions using either the DAQFlex software API library or the DAQFlex firmware architecture. • The DAQFlex software API is an open source library that implements a simple message-based protocol consisting of textbased commands, or messages. The software API operates with standard drivers for Windows or Linux. Refer to the Software API topics in the DAQFlex Help file for more information on using the DAQFlex software API. • The DAQFlex firmware architecture uses a String Message Based Interface (SMBI) to communicate with DAQFlex series hardware using a minimal number of device transactions. Communication with the device is accomplished through the USB driver (winusb, libusb, or other custom driver). Only experienced USB programmers should attempt to write a driver for use with the DAQFlex firmware. Refer to the Firmware Specification in the DAQFlex Help file for more information on using the DAQFlex firmware. The source code for the DAQFlex software API may be used as a guide for developing a driver to interface directly with the hardware. Getting started with the DAQFlex software API library Windows XP and Windows Vista: 1. Run the DAQFlex.msi Windows installer. When running Windows XP, a winusb driver is automatically installed. This driver is included on Windows Vista. 2. Run the DAQFlex test application (FlexTest.exe). This application is an interactive C# console program that demonstrates how to use the DAQFlex software API. Additionally, you can build and run the C# or VB .NET example programs included in the installation using ExampleBuilder or Visual Studio (version 2005 or greater). 3. Review the DAQFlex Help file for the functions supported by DAQFlex series hardware. Linux: 1. Using your Software/Package manager, verify that the Mono framework (version 2.4 or later) and the libusb user-mode driver are installed on your Linux system. If these versions aren't listed, information on installing, updating, or adding software repositories to your Software/Package manager can be found at the following links. Click here to go to the Mono web site. Click here to go to the libusb web site. 2. As a root user, create a symbolic link to the libusb-1.0 shared object file. For example: ¡ $ ln -s /usr/lib/libusb-1.0.so.0/usr/lib/libusb-1.0.so (The actual file location may vary.) 3. Extract the files from the DAQFlex-1.3.tar.gz archive file from the DAQFlex software CD using an archive manager. 4. In a terminal window, set the current directory to DAQFlex/Source/DAQFlexAPI. 5. As a root user, run the following commands: ¡ $ make ¡ $ make install 6. Restart the system. 7. In a terminal window, set the current directory to DAQFlex/Source/DAQFlexTest. 8. As a root user, run the following commands: ¡ $ make ¡ $ make install 9. From a terminal window, run the FlexTest application using the following command: ¡ $ flextest This application is an interactive C# console program that demonstrates how to create an application using the DAQFlex software API. Additionally, you can build and run the C# example programs included in the installation using MonoDevelop or the Mono command line interpreter. 10. Review the DAQFlex Help.pdf file for the functions supported by DAQFLex series hardware. Page 42 of 43
Using the DAQFlex firmware architecture • Communicate with DAQFlex series hardware through the USB driver installed on your system (winusb, libusb, or other custom driver). Only experienced USB programmers should attempt to write a driver for use with the DAQFlex firmware. Experience with CONTROL transfers for asynchronous communications, and BULK transfers for synchronous communications is recommended. • Refer to the Windows driver (winusb) or the Linux driver (libusb) for an example of how to communicate with DAQFlex series hardware. • Refer to the Firmware Specification in the DAQFlex Help file for more information on using the string-based messages, transfer methods, and commands that are supported by the DAQFlex firmware. Page 43 of 43
Page 11 and 12: Analog input scan operation C# Visu
Page 13 and 14: DEV Sets and gets device property v
Page 15: RESET Message Device response Descr
Page 19 and 20: SCALE 1 Message Device response Des
Page 21 and 22: SAMPLES Message Device response Des
Page 23: LOWCHAN Message Device response Des
Page 26 and 27: CAL 1 Message Device response Descr
Page 28 and 29: AO Sets and gets property values fo
Page 30 and 31: DIO Sets and gets property values f
Page 34 and 35: Note: Click Send Message after chan

Introducing Message-Based DAQ

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