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Handbook: xxxmmsubcom tme xxxmmsub1 dass448720m4v

.m4v is a video file format developed by Apple, similar to MP4 but optimized for iTunes, Apple TV, and FairPlay DRM-protected content. It is commonly used for:

1. Power up module, wait 100 ms for regulator stabilization.
2. Deassert RESET, wait 50–200 ms for boot.
3. Send identification command (e.g., "AT+ID") and expect response within 500 ms.
4. Configure defaults (baud rate, parity, flow control).

• Visual check for damage, correct part marking (dass448720m4v).
• Continuity tests for power and ground.