55 … AA frame — 1535 nm C-series 6 km and 8 km modules (2 scanned manuals)
Read from scanned manuals · page-image checked · example checksums re-derived · page citations kept
The host sends `55 | command + payload + XOR checksum (4 bytes) | AA`. The module answers with a 15-byte frame headed by AA and terminated by 55; the checksum covers bytes 2–13. Query replies start with CC.
Frame layout
命令帧 6 字节：0x55 | 命令码+参数+校验（4 字节）| 0xAA；校验 = 第 2–4 字节 XOR。应答 15 字节：0xAA | 目标数 | 首目标距离高/低/小数 | 末目标距离高/低/小数 | 状态字节 | 激光发射计数（4 字节）| 校验（第 2–13 字节 XOR）| 0x55；查询应答帧头 0xCC。UART-TTL，115200 bps（出厂）/57600/38400/9600，8N1。源：手册 p4–p5（扫描件 OCR，170dpi 目检）。
Command set
| Code | Function | Send | Reply | Notes / page |
|---|---|---|---|---|
0xF2 | Single-shot ranging | 55 F2 00 00 ?? AA | 见 p5 Table 3/5 | 原文该行只印 3 字节（0xF2 0x00 0x00），未给校验字节；不推断 |
0xF3 | 1 Hz ranging | 55 F3 01 00 F2 AA | 见 p5 Table 3/5 | 校验 = 字节 2–4 XOR |
0xF3 | 2 Hz ranging | 55 F3 03 00 F0 AA | 见 p5 Table 3/5 | 校验 = 字节 2–4 XOR |
0xF3 | 3 Hz ranging | 55 F3 04 00 F7 AA | 见 p5 Table 3/5 | 校验 = 字节 2–4 XOR |
0xF3 | 4 Hz ranging | 55 F3 05 00 F6 AA | 见 p5 Table 3/5 | 校验 = 字节 2–4 XOR |
0xF3 | 5 Hz ranging | 55 F3 02 00 F1 AA | 见 p5 Table 3/5 | 校验 = 字节 2–4 XOR |
0xF3 | 10 Hz ranging | 55 F3 06 00 F5 AA | 见 p5 Table 3/5 | 校验 = 字节 2–4 XOR |
0xF3 | Stop ranging | 55 F3 00 00 F3 AA | 见 p5 Table 3/5 | 校验 = 字节 2–4 XOR |
0xF6 | Baud-rate setting | 55 F6 XX XX CHK AA | 见 p5 Table 3/5 | XX = 波特率/100（十六进制）；XX 为字节 2–4 XOR |
0xF0 | Self-test command | 55 F0 00 00 ?? AA | 见 p5 Table 3/5 | 原文只印 3 字节，未给校验字节；不推断 |
0xF8 | Status query | 55 F8 00 00 ?? AA | 见 p5 Table 3/5 | 原文只印 3 字节，未给校验字节；不推断 |
0xF4 | Range-gate setting | 55 F4 XX XX CHK AA | 见 p5 Table 3/5 | XX = 门限距离；CHK = 字节 2–4 XOR |
Timing and rates
p3 · Baud 115200 bps (factory) / 57600 / 38400 / 9600; 8N1; LSB first.
Status codes and errors
p5 · 状态字节（byte 9）：0xF2 单次 / 0xF3 1Hz / 0xF6 2Hz / 0xF7 3Hz / 0xF8 4Hz / 0xF4 5Hz / 0xFA 10Hz / 0xF5 停止；查询数据 byte 4：0x00 默认 / 0x03 自检发射正常 / 0xFF 异常。
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 2 manuals in this family. The raw OCR text stays offline; only what the page images show is published.
Models covered by this page
- LRF0609C
- LRF0818C (datasheet only — no model page yet)
Source documents
- LRF0609C · LRF0609C.pdf (16 pages)
- LRF0818C · LRF0818C.pdf (16 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.