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- 2009-06-20bn
- This document describes the protocol for the ultrasound fill-meter USF 1000 S.
- Datagram is of FS20 sensor message type:
- 81 0C 04 ?? 01 01 A0 01 A5 CE AA 00 cc xx
- 81: begin of FS20/FHT communication
- 0C: remaining length of datagram (12 bytes)
- 04: type of datagram
- ??: checksum
- 01 01 A0 01: FS20 fix sequence, always 01 01 A0 01
- A5 CE: FS20 housecode, always A5CE
- AA: FS20 command, always AA
- 00: always 00
- cc: code, see below
- xx: measured distance in cm
- code:
- hex bin
- 37 00110111 30min message interval, normal operation
- B7 10110111 3s message interval, normal operation
- F7 11110111 3s message interval, battery low
- |||+++++-- 0x17 always 0x17
- ||+------- 0x20 always 1 (= value byte follows)
- |+-------- 0x40 battery warning
- +--------- 0x80 test mode (3s message interval)
- measured distance from ultrasound sender/transmitter:
- distance hex dec
- 0.50 m 0x30 48
- 1.00 m 0x60 96
- 1.50 m 0x92 146
- 2.00 m 0xC4 196
- It is assumed that xx is the distance in centimeters from the top of the box
- (4 cm box height + 1 cm height of ultrasound sender/transmitter).
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