Difference between revisions of "Lascar Electronics EL-USB-2"

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Revision as of 05:03, 26 November 2012

EL-USB-2

The Lascar Electronics EL-USB-2 is a USB-based temperature and humidity logger.

See Lascar Electronics EL-USB-2/Info for more details (such as lsusb -vvv output) about the device.

Hardware

Photos

  • EL-USB-2 side.jpg
  • EL-USB-2 uncapped.jpg
  • EL-USB-2 battery.jpg
  • EL-USB-2 sensor.jpg
  • EL-USB-2 PCB top.jpg
  • EL-USB-2 PCB bottom.jpg
  • EL-USB-2 F321.jpg
  • EL-USB-2 24LC256.jpg

Protocol

Commands

Bytes Command
0x00 0xff 0xff Get device configuration structure.

A 3-byte header is returned first in which the first byte is 0x02, and the second and third bytes are the length of the configuration structure to follow, as a little-endian integer representing the number of bytes. Different devices in the EL-USB series have differently-sized configuration structures.

Device configuration structure

Offset Size Value
0x00 1 Device type
1,2 EL-USB-1
3 EL-USB-2
4,6 EL-USB-3
5,7 EL-USB-4
8 EL-USB-LITE
9 EL-USB-CO
10 EL-USB-TC
11 EL-USB-CO300
12 EL-USB-2-LCD
13 EL-USB-2+
14 EL-USB-1-PRO
15 EL-USB-TC-LCD
16 EL-USB-2-LCD+
17 EL-USB-5
18 EL-USB-1-RCG
19 EL-USB-1-LCD
20 EL-OEM-3
21 EL-USB-1-LCD
0x01 1 Unused
0x02 16 NULL-terminated device name, 15 chars max
0x12 1 Start time, hour (0-23)
0x13 1 Start time, minute (0-59)
0x14 1 Start time, second (0-59)
0x15 1 Start date, day (1-31)
0x16 1 Start date, month (1-12)
0x17 1 Start date, year (year - 2000)
0x18 4 Unsigned little-endian, seconds remaining until logging starts
0x1c 2 Unsigned little-endian, samplerate (seconds between samples)
0x1e 2 Unsigned little-endian, number of stored samples
0x20 1
Bit Alarm conditions bitfield (1=enable)
0 temperature high
1 temperature low
2 temperature high hold
3 temperature low hold
4 relative humidity high
5 relative humidity low
6 relative humidity high hold
7 relative humidity low hold
0x21 1
Bit bitfield
0
1
2
3
4
5
6
7
0x22 1 Temperature alarm high (value + 40) * 2
0x23 1 Temperature alarm low (value + 40) * 2
0x24 4 unknown (00 00 00 3f, 00 00 80 3f)
0x28 4 unknown (00 00 20 c2)
0x2c 2 unknown (00 00)
0x2e 2 unknown (possible temp unit, 00 00=C, 01 00=F)
0x30 4 Firmware version (ASCII, not NULL-terminated
0x34 2 Unsigned little-endian, serial number
0x36 2 unknown (00 00)
0x38 1 Relative humidity alarm high (value * 2)
0x39 1 Relative humidity alarm low (value * 2)
0x3a 2 unknown (00 00)
0x3c 4 unknown (00 00 00 00)

The rest of the 128-byte payload is padded with 0xff.

Resources

TODO.

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