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41 lines
1.1 KiB
Plaintext
41 lines
1.1 KiB
Plaintext
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2009-06-20bn
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This document describes the protocol for the ultrasound fill-meter USF 1000 S.
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Datagram is of FS20 sensor message type:
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81 0C 04 ?? 01 01 A0 01 A5 CE AA 00 cc xx
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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 CE: FS20 housecode, always A5CE
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AA: FS20 command, always AA
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00: always 00
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cc: code, see below
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xx: measured distance in cm
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code:
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hex bin
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37 00110111 30s message interval, normal operation
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B7 10110111 3s message interval, normal operation
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F7 11110111 3s message interval, battery low
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|||+++++-- 0x17 always 0x17
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||+------- 0x20 always 1 (= value byte follows)
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|+-------- 0x40 battery warning
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+--------- 0x80 test mode (3s message interval)
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measured distance from ultrasound sender/transmitter:
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distance hex dec
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0.50 m 0x30 48
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1.00 m 0x60 96
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1.50 m 0x92 146
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2.00 m 0xC4 196
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It is assumed that xx is the distance in centimeters from the top of the box
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(4 cm box height + 1 cm height of ultrasound sender/transmitter).
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