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23 lines
619 B
Plaintext
23 lines
619 B
Plaintext
2009-09-12bn
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This document describes the protocol for the brightness sensor BS.
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Datagram is of FS20 sensor message type:
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81 0c 04 ?? 01 01 a0 01 a5 cf xx 00 yy zz
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81: begin of FS20/FHT communication
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0c: remaining length of datagram (12 bytes)
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04: type of datagram
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??: checksum
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01 01 a0 01: FS20 fix sequence, always 01 01 a0 01
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a5 cf: FS20 housecode, always a5cf for brightness sensor BS
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xx: sensor #
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00: always 00
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yy zz: code, see below
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yy zz
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76543210 76543210
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| ++ ++++++++----- 10 bit resolution brightness value (0..1023)
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+------------------- 0x20 always 1 (= value byte follows)
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