WISE‑S251‑A Advantech is a modular IoT I/O module featuring 6 digital inputs plus 1 RS‑485 port, using Wi‑Fi 2.4 GHz (IEEE 802.11 b/g/n) (dual‑band support optional on some revisions). It pairs seamlessly with WISE‑4200/4400 series controllers, significantly reducing wiring cost in data acquisition. Built‑in RS‑485 runs at up to 115.2 kbps, and the device supports secure boot, OTA updates, and a Cortex‑M4F security subsystem. Operating temperature ranges from –25 °C to +70 °C
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