This guide explains how to use serial commands to check a GrowSpace UWB tag’s real-time distance and position data, and how to configure its update rate.
(For use in Tera Term or another serial terminal environment)
Applies To
- GrowSpace UWB personnel tags / asset tags
- Developer tags
Purpose
- Check a tag’s computed position in real time
- Check distance to each anchor and the quality factor
- Adjust the update rate to optimize responsiveness or battery life
Basic Commands
For the basic commands common to tags, listeners, and anchors, see the link below.
Command Summary
| Command | Description |
|---|---|
lec | Outputs distance and position data (CSV format) |
lep | Outputs position data only (CSV format) |
aurs [nom] [stat] | Sets the update rate (in 100ms units) |
aurg | Checks the current update rate |
Command Details
✅ lec – Output distance and position data
Example input
lec
Example output
DIST,4,
AN0,365D,-2.92,0.35,0.00,9.22,
AN1,3833,-5.20,15.04,0.00,6.00,
AN2,2FCC,-5.45,2.58,0.00,8.89,
AN3,1027,-1.00,11.48,0.00,3.35,
POS,-3.34,9.49,-1.34,75
Fields explained
| Field | Description |
|---|---|
DIST,4 | Receiving distances from a total of 4 anchors |
ANx | Each anchor’s ID, coordinates (x, y, z), and distance (m) |
POS | The tag’s position coordinates (x, y, z) and quality factor (QF: 0–100) |
- lec is the command most commonly used for testing and debugging.
- It lets you see both the distance calculations and quality status at once.
✅ lep – Output position data only
Example input
lep
Example output
POS,-3.41,9.54,-1.53,74
POS,-3.42,9.53,-1.53,73
POS,-3.40,9.55,-1.55,71
POS: the tag’s real-time computed position coordinates- Last number: quality factor (QF) – 0 to 100 (higher is more accurate)
lep outputs only coordinates, with no distance data,
making it well suited for log collection and bulk recording.
✅ aurs [nom] [stat] – Set the update rate
Example input
aurs 2 5
Meaning
| Parameter | Description |
|---|---|
nom=2 | Sends a position update every 200ms while moving |
stat=5 | Sends every 500ms while stationary |
- Values are in 100ms units.
(e.g.,3→ 300ms)
✅ aurg – Read the current update rate
Example input
aurg
Example output
aurg: nom=2 stat=5
Use this command to check the update rate currently applied.
Notes
- The
lecandlepcommands output valid position data only once the tag is connected to 3 or more anchors. - The update rate setting affects the following:
- Shorter interval: faster response, more battery use
- Longer interval: better battery life, slower position response
- A quality factor (QF) of 60–80 or higher generally indicates a fairly stable positioning state.