Download Wireshark (free) or Bus Pirate firmware (free) to reverse-engineer the communication of the DASS167. You can learn exactly what commands it expects by sniffing the bus while a licensed version runs.
If you are a student or professor, email the manufacturer directly. Say: "Requesting educational access to DASS167 SDK for non-commercial research." Many vendors provide free licenses to accredited universities. Conclusion: What "DASS167 Free" Really Means The search for "dass167 free" is not a fantasy. You can legally obtain free manuals, free open-source drivers, and free salvage hardware if you invest time rather than money. dass167 free
However, you cannot ethically or safely obtain a brand-new, fully supported DASS167 with proprietary software for zero cost. The industrial market does not work like consumer apps. Download Wireshark (free) or Bus Pirate firmware (free)