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Protocol
Igor Kuz edited this page Jul 31, 2026
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1 revision
The full reference lives in the repo: docs/PROTOCOL.md.
Summary of what this integration establishes (much of it in no HTD documentation):
- Frame format
02 <res> <zone> <cmd> <data…> <checksum>; checksum = sum mod 256. Query-ID reply is bare ASCII (Lync12) with no framing. - Volume, bass, treble, balance use signed bytes on firmware v3 — HTD's Serial Commands v1.1 PDF's 0x80-offset tables are wrong.
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Doorbell message
0x1F(undocumented, discovered by live capture): data0x02= chime started (input bitmask),0x00= chime ended. During the chime the unit powers zones on and routes them to Intercom, without reverting afterwards. - Source select codes: 1-12 →
0x10-0x1B, 13-18 →0x63-0x68, MP3/Intercom →0x7E. Party-mode variants0x36-0x41/0x69-0x6Eare sent per zone, not broadcast. - Doorbell enable/disable uses reserved byte
0x01. - Zone status frames are 14 bytes; the input byte is 0-based; D1 bit 7 is set on v3 and must be masked.
Verified against: a real Lync 12 (firmware v3), HTD's published Lync Hex Codes, and the official HTD Android app (Cordova — its command logic is plain JavaScript).