55 CMD LEN frame — 1535 nm C-series long-range modules (9 scanned manuals)
Read from scanned manuals · page-image checked · example checksums re-derived · page citations kept
Both directions are six bytes: `55 | CMD | LEN | DATAH | DATAL | CHK`. LEN counts the bytes except the start byte, command word and checksum (2 for a two-byte payload); CHK is the XOR of every byte except CHK, including the 55 start byte.
Frame layout
命令帧 6 字节：0x55 | CMD | LEN | DATAH | DATAL | CHK；LEN = 除 STX0/CMD/CHK 外的字节数（2 个数据字节时 LEN=02）；CHK = 除 CHK 外所有字节 XOR（含 0x55）。应答：0x55 | CMD_JG | LEN | DATA… | CHK。UART-TTL/RS-422 可选，115200 bps，8N1。源：手册 p4–p5（扫描件 OCR，170dpi 目检）。
Command set
| Code | Function | Send | Reply | Notes / page |
|---|---|---|---|---|
0x00 | Standby (stop continuous ranging) | 55 00 02 00 00 57 | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0x01 | Single ranging | 55 01 02 00 00 56 | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0x02 | Continuous ranging (period in ms) | 55 02 02 XX YY CHK | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0x03 | Self-test | 55 03 02 00 00 54 | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0x04 | Distance selection / nearest blind zone (unit 1 m) | 55 04 02 XX YY CHK | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0x06 | Cumulative light-output query | 55 06 02 00 00 51 | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0x11 | APD power on | 55 11 02 00 00 46 | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0x12 | APD power off | 55 12 02 00 00 45 | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
0xEB | Number query | 55 EB 02 00 00 BC | see p5 response table | p4 Table 3 示例码；校验 = 除 CHK 外全部字节 XOR |
Timing and rates
p3 · Baud 115200 bps; TTL/RS-422 selectable; 8N1.
Status codes and errors
p5 · 0xED 工作超时（激光保护，数据 00 00）；0x03 自检 12 字节，含 APD 温度/高压/盲区/±5V 电压。
What the source does not state
Where a manual prints an incomplete reply (for example only 55 for the
LD constant-on acknowledgement), this page reproduces that and stops — it does not pad the frame.
Anything not printed in the manual is absent here on purpose.
These manuals are scans with no text layer. The frame and command bytes above were read from 300 dpi page images (then re-rendered at 170 dpi for a second look), the printed example frames were re-checked against the checksum rule, and the layout is identical across the 9 manuals in this family. The raw OCR text stays offline; only what the page images show is published.
Models covered by this page
- LRF0610C
- LRF0815C
- LRF1017C
- LRF1221C
- LRF1222C
- LRF1525C
- LRF1829C
- LRF1830C
- LRF1831C (datasheet only — no model page yet)
Source documents
- LRF0610C · LRF0610C.pdf (9 pages)
- LRF0815C · LRF0815C.pdf (9 pages)
- LRF1017C · LRF1017C.pdf (9 pages)
- LRF1221C · LRF1221C.pdf (9 pages)
- LRF1222C · LRF1222C.pdf (9 pages)
- LRF1525C · LRF1525C.pdf (9 pages)
- LRF1829C · LRF1829C.pdf (9 pages)
- LRF1830C · LRF1830C.pdf (9 pages)
- LRF1831C · LRF1831C.pdf (9 pages)
Transcription method: these PDFs have no text layer, so this page was built from OCR plus a 170 dpi re-read of the page image. Every example frame was re-derived from the checksum rule the manual prints; a byte that is not legible in the page image is not published.