Colead SL-5868P

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Colead SL-5868P.jpg

The Colead SL5868P is an inexpensive sound level meter with RS232 capability. It has Lp and Leq measurement modes, and can trigger alarm conditions based on a configured level.

It is rebranded under many names, but appears to generally have the SL-5868P model designation. It's available for under $100.

Hardware

Photos

Protocol

TODO: serialcomm

The meter sends two measurements per second. When a new measurement is ready, the device sends 0x10. The PC responds with 0x20, which causes the device to transmit a 10-byte structure containing configuration and measurement.

Commands

Command Direction Description
0x10 Device -> PC Measurement ready
0x20 PC -> Device Send measurement

Data structure

Byte Description
0 ?
1 ?
2 ?
3 ?
4 ?
5 BCD-encoded dB value, most significant digit
6 BCD-encoded dB value, second digit
7 BCD-encoded dB value, least significant digit
8 ? (always 0x01)
9 checksum: sum of bytes 0-8