AiM systems acquire data from the ECU of your vehicle.
The list of available ECU drivers, constantly updated and upgraded, includes 1,000 + different ECUs, either Stock and Racing; they are sorted by manufacturer/vehicle model: for each ECU you find the proprietary communication protocols, including the standard OBDII ones.
From a hardware point of view, AiM systems manage the following data lines: CAN, RS232 and K-Line.

AiM systems analog inputs are recorded up to 1,000 times per second each.
You can connect and monitor all kinds of sensors, like:

The internal three-axial accelerometer and the gyroscope provide the AiM systems a very powerful array of information. These force and motion sensors enable you to quantify the dynamic characteristics of your vehicle. Measuring acceleration forces and gyro rates can assist in determining how to improve your vehicle performances.

With AiM systems you immediately get Math Channels values: the dash logger can be configured to display those values (i.e. brake bias, calculated gear) in real time.

An innovative AiM systems feature is its CAN2 line, managing data coming from your additional modules (i.e. ABS, traction control, infrared temperature sensors and more...).
This feature meets the requirements of a growing number of racers, as the use of additional modules is becoming quite common in a number of series.