What is a datalogger?


Similar Questions:
Where can I get a datalogger?
How does the datalogger work?
Can I build my own datalogger?

A datalogger is a device that monitors and records information for you. Dataloggers are often used on racing vehicles, to provide the tuners with better information from which to base tuning decisions.

Although there are several dataloggers available for DSMs, most people who refer to a 'datalogger' mean the TMO datalogger fromTechnomotive, although some might be referring to the Pocketlogger or DSMlink. These extremely useful devices recieve and interpret a continuous stream of information from the DSM ECU, allowing a 'sneak peek' into the 'thinking' of the car.

These products operate using proprietary software and hardware to collect, interpret, analyze and display the ECU information. To do a similar job, a device would have to know the format of the information output by the DSM ECU.

Specific information concerning DSM ECUs and their output format is not in the public domain and might only be found by deciphering the DSM ECU code. Advanced tuners have agreed that the 1G DSM uses the ALDL (Assembly Line Data Link) interface similar to many General Motors cars. For more information on ALDL, see this answer in this FAQ.

2G vehicles use the OBD-II system, which is not compatible with ALDL. The OBD-II system was adopted as an industry standard on later model cars. However, the OBD system is slower and has less information available as compared to the proprietary solutions.

It is possible to create a datalogger to monitor the same information that commercial datalogging systems provide. However, to create a comprehensive standalone system capable of matching the TMO logger, Pocketlogger or DSMlink in capability is a formidable task for most people. The job has recently been simplified as freeware datalogging software and ready-made cables have become available.

Those interested in the details of DSM datalogging may find the Pocketlogger FAQ and Technomotive's Datalogger 101 guide helpful.

The Last Word: TMO is long gone, but you can still buy Pocketloggers. At least until all the serial-port Palm units die - there doesn't seem to be a ALDL-to-USB device available (yet?).

QA #107

Last Updated:
2016-06-03 08:31


Cam Dorland | 95 Eagle Talon
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