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应用文章
Introduction
Decoding amplitude-shift keying (ASK) key fob communication based on Manchester encoding is sometimes necessary during the turn-on and debug phase of key fob development. Decoding key fob RF-bursted packets requires demodulation prior to digital decoding. Since protocol decoding in Keysight’s InfiniiVision X-Series oscilloscopes is based on hardware technology (real-time decoding), demodulation must be performed in hardware. InfiniiVision oscilloscopes can digitally demodulate key fob RF signals within the scope itself —in a roundabout way — using a special trigger mode and a trigger output signal.
This application note provides an overview of Manchester encoding, along with instructions on how to probe and capture key fob signals; hardware demodulate each burst/packet; and, set up the scope to decode each transmitted message at data rates up to 5 Mbps using the User-definable Manchester/NRZ Trigger and Decode option (DSOXT3NRZ/DSOX4NRZ) on Keysight’s InfiniiVision 3000T and 4000A X-Series oscilloscopes.
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