Upd: Dass 481

| Feature | DASS 481 UPD | Generic Chinese 4CH RTU | NI CompactDAQ | |---------|--------------|------------------------|----------------| | Price (approx.) | $450–$600 | $150–$250 | $1,200+ | | Input Protection | TVS diodes, 1.5kV isolation | None or basic fuse | 2.3kV isolation | | UDP Support | Native | No (Modbus only) | Yes, with driver | | Operating Temp | -20 to +70°C | 0 to +50°C | -40 to +70°C | | Best For | Mid-range industrial | Benchtop testing | High-channel lab work |

Click “Start Upgrade”. Do not power cycle during the process (typically 3–5 minutes). The LED will flash alternating green/red. dass 481 upd