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Introduction & Overview As in-vehicle networks become increasingly more sophisticated, both in terms of the number of controllers and the speed at which they communicate, they are becoming virtual “data goldmines” for the test engineer and technician.  If the data are already available on the vehicle and can be accessed from the standard OBD (DLC) connector under the dashboard, the test engineer only needs to add the missing sensors, or possibly none at all! DAWNTM (Data Acquisition With In-Vehicle Networks) is HEM Data’s complete in-vehicle network data acquisition and analysis software and hardware solution. DAWN is a versatile tool that acquires data from in-vehicle networks conforming to CAN, SAE J1939, J1708, SAE J1979, J1850, ISO15765, ISO9141, and OBD-II. This means you can acquire network data from any automobile on the road today from model year 1996. In particular, the CAN (Controller Area Network) protocol is becoming the most important protocol since many vehicles already have CAN networks and by 2008 all vehicles will utilize the CAN protocol. DAWN™ acquires J1939 CAN and J1708/J1587 data from heavy duty vehicles such as trucks, buses and off-road vehicles for agriculture, construction and marine applications. In addition, a major feature of DAWN™ is that you can simultaneously acquire data from both in-vehicle networks and directly from sensors!   DAWNTM is  an integrated software and hardware solution that includes: Snap-MasterTM data acquisition, analysis, display, storage & retrieval software Vehicle Interface Hardware with optional Analog I/O hardware depending on  the model selected. DawnEdit + Sample Database (OBD-II, J1939 or custom database) Message Monitor SAE J1699 Application Software to test vehicle interface hardware functionality  and to identify the vehicle’s protocol for OBD-II. 1 year Support & Warranty on hardware and software 2 day training class (optional, but recommended) DAWN Hardware Models to Meet Your Needs When you buy DAWN from HEM Data you receive the complete software and hardware solution plus support from HEM Data and a 1 year warranty. If you already own compatible network interface test tool, then you only need to purchase the DAWN software. HEM Data has integrated its DAWN™ product for acquiring data from in-vehicle networks with CarDAQ-Plus and AVIT™ by Drew Technologies'. CarDAQ-Plus is targeted for PC-based data acquisition of in-vehicle network data. AVIT is ruggedized data logging hardware for unmanned, data collection without a PC. HEM Data has ported its Snap-Master™ for Windows software to run on Linux, AVIT’s operating system. As a major benefit, the user configures the logger with the Snap-Master™ for Windows user-interface. The resulting settings are saved and transferred to the logger. With no software programming, the logger is then ready to acquire data after the AVIT cable is connected to a standard vehicle adaptor.  AVIT is specifically designed to mount in the vehicle with its extended temperature range, the ability to hibernate to save power when the vehicle is switched off, and a quick wake-up. AVIT can also be used for PC-based data acquisition for real-time display and analysis that is valuable for vehicle diagnostics.  AVIT is capable of acquiring a wide range of heavy-duty and automotive protocols as well as simultaneously acquiring analog and GPS data. It also communicates wirelessly using Wi-Fi and cellular links. AVIT Vehicle Interface Hardware Supported by DAWN DAWN works with hardware manufacturers who support the SAE J2534 standard for data transfer between the PC and the network acquisition hardware. The benefit to you is that you can combine HEM Data’s feature-rich software with the best hardware for your application. DAWN has a variety of hardware test tool options. Some hardware solutions allow you to acquire all protocols with one model while other models are targeted to a specific protocol. DAWN hardware models offer a variety of interfaces to the computer including Ethernet, USB, PCMCIA, RS-232 and PCI. A major feature of DAWN is that it is easy to acquire engineering parameters such as engine RPM, wheel speeds, ambient temperature, brake on/off status, and even hybrid electric vehicle parameters such as generator and motor speed and torque. Click here for examples of Prius hybrid electric (HEV) test data. DAWN Builds on Snap-Master's Proven Track Record Since DAWN is built on HEM Data’s award winning Snap-MasterTM software, you have all of the data acquisition, real-time analysis, plotting, storage/retrieval, and post analysis capabilities that have been developed since Snap-Master was released in 1991 as the first Windows-based data acquisition and analysis software. Snap-Master was voted the top in-vehicle data acquisition and analysis product by "Automotive Engineering" magazine. The benefit to you is that by using DAWN, you are using an established software solution that integrates data acquisition with a variety of display types (Y-T & X-Y plots, stripcharts, and digital, dial and bar meters plus indicators). Snap-Master emulates virtually all conventional instruments, such as a digital storage oscilloscope, X-Y plotter, stripchart recorder, volt meter, waveform analyzer and spectrum analyzer.   Sample OBD-II Data     Dial meter displays with digital readout provide both the analog representation and the precise digital values   Using the same innovative flowchart approach of Snap-Master, DAWN is also intuitive, thereby making network data as easy to acquire as analog data. Example Snap-Master Instrument to Acquire, Display and Store Data You also have all of the features of Snap-Master, such as replaying data as quickly as possible for analysis, or to pace the replay up to 10X faster or slower than real-time. With our extensive Waveform Analysis and Frequency Analysis that comes standard with DAWN, you are ready for almost any data analysis requirements you encounter whether it is for real-time or post-processing. Since Snap-Master is known for its ease-of-use, we have extended its capabilities to acquire in-vehicle network data. Snap-Master was the first data acquisition software to include a sensor database to automatically produce data in engineering units and auto scales the plots to match the range for each sensor. DawnEditTM conveniently relates the engineering parameters to the network messages so the software will filter the messages and show the desired parameters scaled to engineering units. Simultaneously Acquire Network and Direct Sensor Data A hallmark of DAWN is that it simultaneously acquires data from both in-vehicle networks and directly from sensors! Using one of the 200 models of A/D hardware that Snap-Master supports, DAWN acquires data directly from sensors. Acquiring sensor data is needed to overcome any limitations of the network because the data is either too slow or the network does not have the required information. You have several interface options to the PC including USB, Ethernet, PCI, PCMCIA, or parallel port as described in the I/O hardware section. If you already own hardware listed in the Analog I/O section then you can use it with DAWN. Some network interface hardware also has 6 to 16 channels of analog hardware.   Comparison of Network (Absolute Acceleration) and Analog (Wheel Speed) Data With Snap-Master's instrument window and icons representing elements it is easy to define the functionality you need. Acquire either network data, analog data, or both simultaneously. Also compare newly acquired data to some reference data to perform pass/fail testing. Simultaneously Acquire GPS and Network Data DAWN acquires GPS (Global Positioning System) data along with network and analog data. GPS data includes latitude, longitude, vehicle speed, altitude and number of satellites used.    Replay Message and Previously Stored Data Files Replay parametric data or messages. Compare previously stored files that were acquired at different times for one vehicle, or several different vehicles. The post processing options are almost endless. Snap-Master's builder makes it easy to point-and-click to build equations. Snap-Master has the ease-of-use of a spreadsheet's user-interface with powerful functions required to analyze engineering data.   Acquire Parametric Data A primary benefit of DAWN is that it unburdens the user from working with raw hexadecimal messages, and makes it easy to acquire data by specifying the parameter name, (e.g. Vehicle Speed, Coolant Temperature or ABS Active). Our goal is to make it even easier to acquire network data than to acquire analog data directly from sensors. However, if you do want to work directly with the messages you also have that option to acquire, store and replay them. DAWN handles the conversion of the network messages to parameters with a built-in database that automatically configures the I/O hardware with the vehicle network. This allows the user to quickly select a specific parameter by name and see the data displayed in engineering units.   After Double-clicking on the J2534 Network icon in Snap-Master, use this table to select the parameters to acquire   For both sensors and network parameters, the scaling and message information only needs to be entered once. Using the parameter's name, select which parameters to acquire by placing a Yes in the Active (Second) column. The approach for network channel assignment is the same for analog channels. DawnEditTM - Parameter and Message Database Manager DAWN includes a database editor, DawnEditTM, to create, edit, and import the different corporate database formats into a single coherent database. You can have as many databases as you wish. The database editor contains two tabs (tables): the Parameter and Message tables. The Parameter tab contains the higher level information that is relevant to the data acquisition user and contains the scaling information. Once the data is entered into the database, the user will see this parameter information in a table after double clicking the J2534 Network icon in Snap-Master. DAWN Editor and Sample Database The Message tab specifies the name of the message and the details regarding the message, such as whether it needs to be requested, its update rate and whether it is from a specific ECU. By having a specific Message table, the message details only need to be specified once and then the message can be referenced by its name in the Parameter table. This is valuable since several parameters are often contained within a given message. Referencing the message by its number is done in the third column in Parameter table from a dropdown list.          The Database Editor has the ability to: Handle PIDs, DPIDs, CPIDs, PGNs, Normal / Functional messages Address different Target ECUs Import databases from a spreadsheet or Vector CAN (DBC) databases. Easily enter data manually Specify the parameter related information Use intuitive table format Intelligent Monitoring Using analysis and the Relay Element that is part of Snap-Master, DAWN becomes an intelligent monitoring solution that will store data only if any of your user-defined criteria have been met. Building on the monitoring capabilities DAWN is also applicable to enhanced vehicle diagnostics. DAWN will even adapt to the vehicle’s status by changing the instrument so that data will be acquired differently, for example, acquiring the data faster or acquiring more parameters to better document the problem. Configure the display to change colors to shown warning and alarm conditions. A digital display provides precise values that use color to designate problems (red) and concerns (yellow). Diagnostics When DAWN is combined with NOVATM, HEM Data’s noise and vibration analyzer, then you have the benefit of combining the in-vehicle network data with sound and vibration to detect impending problems in their early stages. For example, measure power steering pump sound and vibration along with the operating conditions of the vehicle to detect a power steering problem or to demonstrate quietness of the pump over its operating range. Applications Snap-Master is used in a variety of automotive applications including testing of hybrid vehicles, transmissions, ABS braking and vehicle control systems, fuel blends, ride and handling, power steering, emissions, crash-worthiness, and junction boxes. Snap-Master's universal design makes it possible for DAWN users to define an unlimited number of measurement and analysis instrument configurations. Within each instrument, the user has full customization control over real-time and post-process data analysis, display and storage. The Waveform Analyzer module is specifically designed to meet the needs of engineering data - it handles millions of data points with ease and includes "intelligent processing", which lets the user define the points of interest with user-defined logic and use the results in subsequent calculations, such as integrating over a range of data or calculating clutch energy during each shift of the transmission. DAWN is ideal throughout the product’s life cycle including development, performance evaluation, reliability/durability, end-of-line testing, quality assurance, diagnostics, service, troubleshooting, and competitive evaluations. Hybrid Electric Vehicles (Prius Test Data) Hybrid Electric Vehicles (HEVs) are popular due to their fuel efficiency and low emissions. HEVs include the Toyota Prius, Camry, Honda Civic and Ford Escape and many more hybrid models are planned by almost every major automotive manufacturer. Hybrids are also becoming popular for transit buses. Since HEVs incorporate new technology and have a need for greater in-vehicle network capabilities, they have been the leaders in utilizing the CAN bus. All vehicles will use the CAN bus by 2008; the migration from older protocols such as J1850 and ISO 9141 to CAN started just after 2000. HEM Data uses a Prius for the development of DAWN. Below are representative data that you can acquire with CAN.    Overplot up to 64 parameters to see how they inter-relate. You may have up to 10 Y axes. Notice how the motor torque (green) mirrors the regen braking (yellow). Generator speed (dark red) is generally proportional to engine RPM (red).   Display digital meters, dial meters, Y-T and X-Y plots.   Notice voltage changes slightly while Torque, Current and Power are proportional.   Up to 100 plots can be added to a Display Page. Notice the 8 buttons for the 8 independently configured Display Pages.    Summary DAWN is a complete package designed for engineers, scientists and technicians who need to acquire network and even sensor data. From database management to presentation and reporting, DAWN makes data acquisition easy for OEMs, suppliers, oil companies, service, emission test personnel, and anyone else who needs to evaluate some facet of the vehicle’s performance. Contact HEM Data for more details at 800 436-4330 or 248 559-5607. This website is at www.hemdata.com. Thank you for your interest. In-Vehicle Network Standards  Reference publications are listed below.     SAE Publications SAE HS-3000 A book that is a collection of standard for On-Board Diagnostics (OBD) or Light and Medium Duty Vehicles. 2003 edition. Important specifications are: 1699-1&-2, 1850, 1930, 1962, 1978, 1979, 2008, 2012, 2186, 2190,  2284-3, 2534, 2610 SAE J1962 Diagnostic Connector. Referred to as the Diagnostic Link Connector (DLC) and OBD connector SAE J1850 Class B communications. Called Class 2 by GM. SAE J1939 E/E Diagnostics Modes. This defines the message structure and standard PGNs (Parameter Group Numbers). Used by heavy duty truck, buses, marine and off-road vehicles such as agricultural and construction. SAE J2012 Recommended Practice For Diagnostic Trouble Code Definitions SAE J2178/1:  Class B Data Communication Network Messages - Detailed Header Formats and Physical Address Assignments SAE J2190 Enhanced E/E Diagnostic Test Modes – Defines DPIDs.    ISO Publications ISO 7498: Data Processing Systems, Open Systems Interconnection (OSI) Standard Reference Model (OSI Model) ISO/DIS 11898:1993/Amd.1: 1995(E) - Road vehicles, Interchange of Digital Information, controller Area Network (CAN) for High Speed Communication ISO 15765-2: Road Vehicles - Diagnostics on controller area network (CAN) Part 2: Network layer services ISO 15765-4: Road vehicles - Diagnostics on Controller Area Network (CAN) Part 4: Requirements for emissions-related systems ISO 15031-5: Road vehicles Communications between vehicle and external equipment for emission-related diagnostics Part 5: Emissions-related diagnostic services   Download DAWN Demo