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9/28/23, 4:30 PM
4.7.3 LED Outputs
The LMUs 2 LED outputs are designed specifically to control external LEDs. The LED outputs have two states. When on, they provide 3.3V to the external
connector through a 100ohm series resistor. When off, these outputs are high impedance
4.7.4 Status LEDs
The LMU-5541™ is equipped with five Status LEDs; Power, BT, WiFi, GPS, COMM (wireless network). The LEDs use the following blink patterns to indicate
service:
LED #1 (Power LED - Red/Green) Definitions
Condition
LMU Off
U-Boot
Red Solid
Kernel Start
Green Solid
LMU On
Red Solid
LED #2 (BT LED - Red/Green) Definitions
Condition
U-Boot
Kernel Start
BT Off
No LED indication by default
BT On
No LED indication by default
BT Connected No LED indication by default
Customer can define their own BT LED pattern by :
for Bluetooth LED Green :
echo 1 > /sys/class/gpio/gpio184/value
for Bluetooth LED Red:
echo 1 > /sys/class/gpio/gpio185/value
PEG action 133 is currently not supported on 5541 Platform
LED #3 (WiFi LED - Red/Green) Definitions
Condition
U-Boot
Kernel Start
WiFi Off
Client - Not Connected Searching
Client - Not Connected Authenticating Green fast Flashing
Client - Connected
AP Mode
https://puls.calamp.com/wiki/LMU-5541_Hardware_%26_Installation_Guide
LED 1
Off
LED 2
Red Solid
Green Solid
LED 3
Red Solid
Green Solid
Off
Green Slow Flashing
Green Solid
Red Solid
LMU-5541 Hardware & Installation Guide - PULS Wiki
Sample Relay Wiring
10/29
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