CAN networks are highly tolerant in respect of disturbances of the bus communication and failures. In order to test whether a system is behaving properly in case of disturbances or failures, a device used to disturb the CAN bus, its physical properties and the logical levels (recessive and/or dominant) in a targeted, reproducible way. With CANstressD (Digital) or CANstressDR (Digital and Resistor Network), the CAN developer uses a comprehensive disturbance instrument.
Features and Advantages:
CANstress is a standalone hardware module that is inserted directly onto the CAN bus. It contains various triggering conditions and disturbance logics. The fullyequipped module includes a number of resistors that can be software-controlled. These resistors are used to force different bus levels onto the bus lines by limiting the voltage supplied.
Functions:
CANstress supports a range of error and test modes, e.g.:
- Emulation of line failures
- CAN system failures
- Accompanying development tests of electronic control units
- Disturbances of CAN controllers
- Programmable short circuits and interruptions
A programmable static capacitor inserted between the bus lines can be used to simulate various line lengths. 
Detailed information is available in the PDF data sheet.