The DS4004 HIL digital I/O board from dSPACE measures and generates digital I/O signals for hardware-in-the-loop simulations that test electronic control units for body electronics. The board features 96 I/O channels configurable via software with signal conditioning. The digital I/O channels can be used separately or be synchronized in 32-bit words to support various applications. The DS4004 can be used in both the mid- and full-size dSPACE Simulator. Suitable for electrical system voltages of 12, 24, 36, and 42 V, the board's 96 digital I/O channels are arranged in three groups, each with two different voltage systems ranging from 5 to 60 V. The 96 I/O channels of the DS4004 can be configured via software as digital I/O for pulse width modulation measurement or generation, for frequency measurement, or for square waves, and functionalities can be configured with Simulink real-time interface configuration software.