In This Article

This article explains the Stationary feature available on UWB tags.
This feature enables low-power operation by reducing the transmission interval when the tag is not moving.

Stationary works based on an accelerometer sensor, allowing you to configure different transmission behavior depending on whether the tag is moving.

What Is the Stationary Feature?

The Stationary feature lets a UWB tag automatically detect whether it is stationary or moving and applies a different transmission frequency for each state.
This reduces unnecessary transmissions and minimizes battery consumption.

• Motion detection uses the built-in accelerometer.
• When stationary is detected, the transmission frequency is reduced and the tag switches to low power mode.

Enabling the Stationary Feature

Use the acts command to turn on the Stationary feature.

acts <meas_mode> <stnry_en> <low_pwr> <loc_en> <enc> <leds> <ble> <uwb> <fw_upd>

Example:

acts 0 1 1 1 0 0 1 2 0

• Stationary: On
• Low Power: Off

Note: After applying the acts command, you must run reset for the setting to take effect.

Verifying the Configuration

Use the si command to verify that the setting was applied correctly.

Example:

dwm> si
[000000.970 INF] cfg: sync=0 fwup=0 ble=1 leds=0 le=1 lp=1 stat_det=1 (sens=1) mode=0 upd_rate_norm=1 upd_rate_stat=100 label=GR10D3

• stat_det=1 → Stationary feature is enabled
• (sens=1) → the sensitivity level (0–2) can also be checked here

You can also confirm it here:

[000000.960 INF] mode: tn (act,twr,lp,le)  ← check that np has changed to lp

Example Scenario

dwm> si
[000006.880 INF] sys: fw2 fw_ver=x01030001 cfg_ver=x00010700
[000006.880 INF] uwb0: panid=x0000 addr=xDECA8A367CF010D3
[000006.890 INF] mode: tn (act,twr,np,le)
[000006.890 INF] uwbmac: disconnected
[000006.890 INF] uwbmac: bh disconnected
[000006.900 INF] cfg: sync=0 fwup=0 ble=1 leds=0 le=1 lp=0 stat_det=0 mode=0 upd_rate_norm=1 upd_rate_stat=100 label=GR10D3
[000006.910 INF] enc: off
[000006.910 INF] ble: addr=F5:FE:CA:19:0A:C0
dwm> acts 0 1 1 1 0 0 1 2 0
acts: ok
dwm> reset


 DWM1001 TWR Real Time Location System

 Copyright :  2016-2019 LEAPS and Decawave
 License   :  Please visit https://decawave.com/dwm1001_license
 Compiled  :  Mar 27 2019 03:37:38

 Help      :  ? or help

dwm> si
[000000.950 INF] sys: fw2 fw_ver=x01030001 cfg_ver=x00010700
[000000.950 INF] uwb0: panid=x0000 addr=xDECA8A367CF010D3
[000000.960 INF] mode: tn (act,twr,lp,le)
[000000.960 INF] uwbmac: disconnected
[000000.960 INF] uwbmac: bh disconnected
[000000.970 INF] cfg: sync=0 fwup=0 ble=1 leds=0 le=1 lp=1 stat_det=1 (sens=1) mode=0 upd_rate_norm=1 upd_rate_stat=100 label=GR10D3
[000000.980 INF] enc: off
[000000.980 INF] ble: addr=F5:FE:CA:19:0A:C0

Sensitivity Setting and Verification

Setting Sensitivity (scs)

scs <value>

• 0 → Low (512 mg): ignores small movements
• 1 → Normal (2048 mg): default sensitivity
• 2 → High (4064 mg): detects even subtle movements

Example:

dwm> scs 2
scs: ok

Checking Sensitivity (scg)

dwm> scg
sensitivity=1

You can check the currently configured sensitivity level.

Setting the Transmission Interval

You can set different transmission intervals for the stationary state and the normal (moving) state.

Setting the Transmission Interval (aurs)

aurs <normal> <stationary>

• normal: interval while moving (unit: 100ms)
• stationary: interval while stationary

Example:

dwm> aurs 1 100

• While moving: 100ms (1 × 100ms)
• While stationary: 10 seconds (100 × 100ms)

Checking the Transmission Interval (aurg)

dwm> aurg

You can check the currently configured interval.

Summary

The Stationary feature is an essential setting for maximizing battery efficiency and reducing unnecessary data transmission in indoor positioning environments.
We recommend applying it in both testing and production environments.