Data loggers - functional overview
Data loggers are far more than autonomously data storing devices. Today, loggers offer functions and interfaces that enable a wide range of applications. The most important elements can be summarized in the following 4 areas which can be partly or all combined with each other.
- Application: Bus Networks and ECUs Protocols Measuring
Particular emphasis is placed on establishing communication with vehicle networks and electronic control units.In some cases, encryption methods such as Seed & Key must also be used to access the ECU. In other applications, the ECU has to be stimulated by the logger via triggered messages to retrieve data.
- Application: Analog measurements and video data
A further component is the acquisition of analog and digital signals and video data which must be acquired in parallel synchronously to the bus-network communication. For example, temperatures from the vehicle thermal management system (HVAC) can be measured parallel to the bus data from the engine and climate control unit.
- Application: Remote data transmission
In this application the connection via WiFi and modem (3G / 4G) is used for data transmission and remote configuration updates. In addition, GPS signals are often recorded for position determination.
- Application: Gateway operation to PC
Data transmission via ETH interface is of great importance for stationary applications where the logger will be operated on the test bench. The ETH interface can also be used to download measurement data and upload new configurations to the logger. A connection to other DAQ software applications is also possible via DAQ lists and A2L description files.
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