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

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Line 36: Line 36:
| 0x00
| 0x00
| 2
| 2
| unsigned little-endian, device type? 3=EL-USB-2, 9=EL-USB-CO
| Unsigned little-endian, device type? 3=EL-USB-2, 9=EL-USB-CO


|-
|-
Line 75: Line 75:
|-
|-
| 0x18
| 0x18
| 4
| 2
| Unsigned little-endian, seconds remaining until logging starts
 
|-
| 0x1a
| 2
| unknown
| unknown


Line 81: Line 86:
| 0x1c
| 0x1c
| 2
| 2
| unsigned, little-endian samplerate (seconds between samples)
| Unsigned little-endian, samplerate (seconds between samples)


|-
|-
| 0x1e
| 0x1e
| 2
| 2
| unsigned, little-endian number of stored samples
| Unsigned little-endian, number of stored samples


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|-
Line 130: Line 135:
| 0x22
| 0x22
| 1
| 1
| temperature alarm high (value + 40) * 2
| Temperature alarm high (value + 40) * 2


|-
|-
| 0x23
| 0x23
| 1
| 1
| temperature alarm low (value + 40) * 2
| Temperature alarm low (value + 40) * 2


|-
|-
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| 0x30
| 0x30
| 4
| 4
| firmware version (ASCII, not NULL-terminated
| Firmware version (ASCII, not NULL-terminated


|-
|-
| 0x24
| 0x24
| 2
| 2
| unsigned little-endian, serial number
| Unsigned little-endian, serial number


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|-
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| 0x28
| 0x28
| 1
| 1
| relative humidity alarm high (value * 2)
| Relative humidity alarm high (value * 2)


|-
|-
| 0x29
| 0x29
| 1
| 1
| relative humidity alarm low (value * 2)
| Relative humidity alarm low (value * 2)


|-
|-

Revision as of 17:57, 25 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

Status structure

Offset Size Value
0x00 2 Unsigned little-endian, device type? 3=EL-USB-2, 9=EL-USB-CO
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 2 Unsigned little-endian, seconds remaining until logging starts
0x1a 2 unknown
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 current status? (2=stopped, 3=logging)
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
0x24 2 Unsigned little-endian, serial number
0x26 2 unknown (00 00)
0x28 1 Relative humidity alarm high (value * 2)
0x29 1 Relative humidity alarm low (value * 2)
0x2a 2 unknown (00 00)
0x2c 4 unknown (00 00 00 00)

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

Resources

TODO.

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