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LIGO AIR ADAPTER supports multiple output interfaces including RS232, RS485, and AF, ensuring compatibility with a wide range of GPS tracking devices.
LIGO AIR ADAPTER supports multiple output interfaces including RS232, RS485, and AF, ensuring compatibility with a wide range of GPS tracking devices.


=== System Architecture ===
=== Wiring diagram ===
<div style="text-align:center;">
<div style="text-align:center;">
[[File:System architecture1.png|frameless|1150px]]
[[File:System architecture1.png|frameless|1150px]]
<div style="font-style:italic; color:#555;">Figure 1. LIGO AIR ADAPTER — System Architecture</div>
<div style="font-style:italic; color:#555;">Figure 1. LIGO AIR ADAPTER — Wiring diagram</div>
</div>
</div>
* Wireless fuel sensors (Ligo Air / Ligo Air Pro) transmit fuel level data via BLE.
* Wireless fuel sensors (Ligo Air / Ligo Air Pro) transmit fuel level data via BLE.
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| valign="top" |1
| valign="top" |1
| valign="top" style="text-align:left;" |Dimension (without wire), mm
| valign="top" style="text-align:left;" |Dimension (without wire), mm
| colspan="4" valign="top" |670x800
| colspan="4" valign="top" |67x80
|-
|-
| valign="top" |2
| valign="top" |2
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</div>
</div>
=== Sensor pairing and configuration ===
=== Sensor pairing and configuration ===


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<div style="display:flex; gap:30px; align-items:flex-start; flex-wrap:wrap;">
<div style="display:flex; gap:30px; align-items:flex-start; flex-wrap:wrap;">
<div style="flex:1; min-width:280px;">
<div style="flex:1; min-width:280px;">
<div style="font-size:1.2em; font-weight:bold; color:#0054A6;">Installation Report</div>
<div style="font-size:1.1em; font-weight:bold; color:#0054A6;">Installation Report</div>
Each installation report includes:
Each installation report includes:
*Installer Name
*Installer Name
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</div>
</div>


===== Maintenance Report =====
<div style="display:flex; gap:30px; align-items:flex-start; flex-wrap:wrap;">
<div style="flex:1; min-width:280px;">
<div style="font-size:1.1em; font-weight:bold; color:#0054A6;">Maintenance Report</div>
Each maintenance report includes:
Each maintenance report includes:
*Installer Name
*Installer Name
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*Other information
*Other information
*Real installation photos captured via mobile device
*Real installation photos captured via mobile device
</div>
<div>
<div style="text-align:center;">
[[File:maintance-report.png|frameless|284px]]
<div style="font-style:italic; color:#555;">Figure 10. Maintenance report</div>
</div>
</div>
</div>


[[File:maintance-report.png|center|700px|thumb|Figure 10. Maintenance report]]
<div style="display:flex; gap:30px; align-items:flex-start; flex-wrap:wrap;">
 
<div style="flex:1; min-width:280px;">
===== View Report =====
<div style="font-size:1.1em; font-weight:bold; color:#0054A6;">View Report</div>
The View Report function allows users to review installation and maintenance history at any time.
The View Report function allows users to review installation and maintenance history at any time.


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*Installation reports
*Installation reports
*Maintenance reports
*Maintenance reports
 
</div>
[[File:view-report.png|center|700px|thumb|Figure 11. View report]]
<div>
<div style="text-align:center;">
[[File:view-report.png|frameless|284px]]
<div style="font-style:italic; color:#555;">Figure 11. View report</div>
</div>
</div>
</div>


== Troubleshooting ==
== Troubleshooting ==
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| No data on GPS || Incorrect wiring || Verify interface wiring
| No data on GPS || Incorrect wiring || Verify interface wiring
|-
|-
| Sensor not detected || MAC address not added || Reconfigure sensor list
| Sensor not detected || MAC address not added, wrong MAC address || Reconfigure sensor list
|-
|-
| Unstable data || BLE signal attenuation || Reposition adapter
| Unstable data || BLE signal attenuation || Reposition adapter
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|}
|}


== Maintenance ==
== Certification / Compliance ==
{| class="wikitable"
|+ Table 8. LIGO AIR ADAPTER — Maintenance
!Frequency
!Action
|-
|Monthly
|Confirm the status LED indicates normal operation, verify RSSI ≥ −80 dBm at receiver
|-
|Quarterly
|Inspect power and data wiring and the enclosure for looseness, corrosion, moisture, or physical damage.
|-
|Annually
|Full functional test and confirm end-to-end data flow to the GPS/telematics unit.
|}


== Certification / Compliance ==
Refer to [[LIGO AIR ADAPTER Certification & Approvals]] for current certificate status.''


== Support / Contact ==
== Support / Contact ==

Latest revision as of 00:47, 6 July 2026

Safety Information

ℹ️ NOTICE — Important notes during sensor installation

Read and understand all safety information in this document before installing, operating or servicing the LIGO AIR ADAPTER

  • Keep the device out of the reach of children. It is not a toy and contains small parts.
  • Do not modify, drill or otherwise alter the device.
  • Always disconnect power before wiring, connecting/disconnecting cables or servicing.
  • Connect the device only to a power source within the rated input voltage.

Product Overview

Scope

This document provides instructions for installation, configuration, operation, and basic troubleshooting of the LIGO AIR ADAPTER.

It is intended for system integrators, installers, and technical personnel involved in fuel monitoring and GPS telematics systems.

Product Overview

LIGO AIR ADAPTER is a communication and aggregation product designed to connect Ligo Air/Ligo Air Pro wireless fuel level sensors to GPS trackers that do not support BLE communication.

The device acts as:

  • A BLE to wired protocol bridge.
  • A Sensor Union Module (SUM) capable of aggregating data from multiple sensors.
  • A BLE signal receiver with enhanced sensitivity for extended wireless range.

LIGO AIR ADAPTER supports multiple output interfaces including RS232, RS485, and AF, ensuring compatibility with a wide range of GPS tracking devices.

Wiring diagram

Figure 1. LIGO AIR ADAPTER — Wiring diagram
  • Wireless fuel sensors (Ligo Air / Ligo Air Pro) transmit fuel level data via BLE.
  • LIGO AIR ADAPTER receives BLE data and processes it.
  • Processed data is transmitted to the GPS tracker via RS232, RS485 or AF interface.
  • Log sensor data for history view and troubleshooting.

Package Contents

Table 1. LIGO AIR ADAPTER — Package content
No. Description Qty (pcs)
1 LIGO AIR ADAPTER 01
2 Quick user guide 01

Specifications

Table 2. LIGO AIR ADAPTER — Detail specifications
No. PARAMETERS RS232 RS485 PRO AF
1 Dimension (without wire), mm 67x80
2 Output interface Digital Analog & Digital Analog
3 Baud rate, bit/sec 2400, 4800, 9600, 14400, 19200, 38400, 115200.
4 Power supply, VDC 7 – 36 VDC
5 Maximum power consumption ~15 mA @13.5VDC
6 Power supply protection 1000VDC reverse polarity protection
7 Operating temperature, °C -40 to 85 °C
8 Waterproof standard IP67
9 Output value range Digital Digital and analog Analog (0-10V)
10 Data output mode SUM, AVERAGE, INDIVIDUAL
11 Bluetooth specs BLE 5.2
12 Average service life, years (expected) 8 years

Installation

Hardware description and installation

Cable and wire definition

Table 3. LIGO AIR ADAPTER — Cable description
No. Wire Color Wire Name Description
1
RED
 VCC Power supply (7–36 V DC)
2
WHITE
 AF Analog output (0–10 V)
3
BLACK
 GND Ground
4
GREEN
 RS485-B Signal wire B for RS485
5
YELLOW
 RS485-A Signal wire A for RS485
6
BLACK
 GND Ground
7
BROWN
 RS232-RX Input data for RS232
8
BLUE
 RS232-TX Output data for RS232

Mechanical installation

  • Install Ligo Adapter inside the vehicle cabin or protected enclosure
  • Avoid direct exposure to water, excessive heat, or strong electromagnetic sources
  • Ensure sufficient distance from high-current cables when possible

Electrical connection

Connect the selected communication interface to the GPS tracker following the table below:

Table 4. LIGO AIR ADAPTER — Wiring connection
No. Wire Name RS232 RS485 AF PRO
1 VCC ✓ ✓ ✓ ✓
2 AF — — ✓ ✓
3 GND ✓ ✓ ✓ ✓
4 RS485-B — ✓ — ✓
5 RS485-A — ✓ — ✓
6 GND ✓ ✓ ✓ ✓
7 RS232-RX ✓ — — ✓
8 RS232-TX ✓ — — ✓
ℹ️ NOTICE — Output Protocol Compatibility — RS232 / RS485 / AF

The PRO model supports all available output communication protocols (RS232, RS485 and AF). Select the output interface compatible with the existing GPS tracker.

LED Status Indication

The Ligo Adapter is equipped with a status LED to indicate its current operating state.

Table 5. LIGO AIR ADAPTER — LED status
LED Status Description
Red blinking No sensor is paired with the adapter
Red solid Sensor(s) paired, but no data is being received
Green solid Valid data is being received from paired sensor(s)

Configuration

Software configuration

LIGO AIR ADAPTER is configured using Ligo BLE Configurator. Please download and install it from Play Store on android OS or App Store on IOS before starting configurations.

The software is structured into three main sections, each serving a specific purpose in the installation, operation and troubleshooting as these below figures.

  • Figure 2. Connection section
    Figure 2. Connection section
  • Figure 3. Settings section
    Figure 3. Settings section
  • Figure 4. Help section
    Figure 4. Help section
Connection section

This section provides general information and real-time status of the device. It allows users to quickly verify that the adapter is powered, accessible, and ready for configuration.

Included information:

  • Device name
  • Device MAC address and serial number
  • Firmware / Hardware version
  • Fuel data of paired sensors
  • Supply voltage and temperature
  • RSSI signal

The Connection section allows users to quickly verify that the adapter is powered, accessible, and ready for configuration.

Settings section

The Settings section contains all configuration parameters related to sensor pairing, output interfaces, and data type. It is intended for device setup and integration with GPS tracking devices.

Key configuration functions:

  • Sensor pairing management (add / remove sensors using MAC address)
  • Output interface configuration (RS232, RS485, AF)
  • Communication protocol
  • Data mode selection (SUM, AVERAGE, INDIVIDUAL)
  • Data log configuration and viewing
  • Installation report generation
Help section

The Support section provides technical assistance and software information.

This section includes:

  • Software version
  • Technical support contact information
  • Reference documentation and troubleshooting resources

This section ensures that users can easily access assistance if necessary.

Sensor pairing and configuration

Sensor pairing

Follow these steps to pair Ligo Air/Ligo Air Pro sensors with LIGO AIR ADAPTER

  • Launch Ligo BLE Configurator application > Select LIGO AIR ADAPTER (the software auto scan nearby BLE Adapter) > press Connect button
  • Switch to Settings section to start pairing sensor to the LIGO AIR ADAPTER as Figure 4.

Parameters configuration

No. Parameter Description
1 Message interval (1..60s) Defines the time interval between two consecutive data transmissions from the LIGO AIR ADAPTER
2 Protocol Selects the output communication protocol used to transmit fuel data to the GPS tracker.
  • SOJI protocol
  • LLS protocol
Table 6. LIGO AIR ADAPTER — Parameter descriptions
3 Automatic transmission mode Defines the data transmission format.
  • HEX format
  • ASCII format
4 Baud rate Sets the serial communication speed for RS232 or RS485 output.
5 Data mode Defines how fuel data from multiple paired sensors is processed before transmission.
  • SUM: Total fuel value of all paired sensors
  • AVERAGE: Average fuel value of all paired sensors
  • INDIVIDUAL: Fuel data from each sensor is transmitted individually upon Modbus request.
6 Address (1-254) Sets the Modbus address of the LIGO AIR ADAPTER.
7 Level min (0..8V) Defines the minimum output voltage level for the AF output.
8 Level max (2..10V) Defines the maximum output voltage level for the AF output.
9 Max volume Defines the maximum digital fuel level resolution used for data transmission.
  • 1023: 10-bit resolution.
  • 4095: 12-bit resolution.

Operation

Data log and settings log

Data log

The Data Log function allows users to view historical fuel level data received from paired sensors over time.

The log records:

  • Timestamp of received data
  • Fuel level values from paired sensors
  • RSSI signal
  • Temperature of sensor

This function is used for:

  • System verification during installation
  • Diagnostic and troubleshooting purposes
  • Validation of sensor communication stability

The user can select a time period (Today, Yesterday, Week, Month, or a Custom Period) and then press the Download button to retrieve the data log, as shown in Figure 6.

The retrieved data log is displayed in the Log Display Area.

Settings log

The Settings Log function allows users to review the historical configuration records of the LIGO AIR ADAPTER.

This log stores all parameter changes previously configured by the user, enabling traceability and verification of device setup.

The user can select the Log source (data from EEPROM or data on the server), and the settings log will be displayed in the Log Display Area, as shown in Figure 7.

Report

Installation Report

Each installation report includes:

  • Installer Name
  • Installation Date and Time
  • Serial Number of Adapter (SN)
  • Model: Vehicle Information
  • Plate number: License of vehicle
  • Other information
  • Real installation photos captured via mobile device
Maintenance Report

Each maintenance report includes:

  • Installer Name
  • Maintenance Date and Time
  • Serial Number of Adapter (SN)
  • Model: Vehicle Information
  • Plate number: License of vehicle
  • Other information
  • Real installation photos captured via mobile device
View Report

The View Report function allows users to review installation and maintenance history at any time.

Steps to open reports:

  • Open View Report in the Ligo BLE Configurator App.
  • Enter the Adapter Serial Number (SN) and press the Search button.

The system displays:

  • Installation reports
  • Maintenance reports

Troubleshooting

Table 7. LIGO AIR ADAPTER — Troubleshooting
Issue Possible Cause Recommended Action
No data on GPS Incorrect wiring Verify interface wiring
Sensor not detected MAC address not added, wrong MAC address Reconfigure sensor list
Unstable data BLE signal attenuation Reposition adapter
Incorrect fuel value Wrong data mode Check SUM / AVERAGE setting

Certification / Compliance

Refer to LIGO AIR ADAPTER Certification & Approvals for current certificate status.

Support / Contact

Table 9. LIGO AIR ADAPTER — Support/ Contact
Channel Detail
Company SOJI ELECTRONICS.,JSC
Address C50-LK13, Lot No. 09, New Urban Area, Le Trong Tan street, Duong Noi Ward, Ha Dong District, Hanoi City, Vietnam
Tel/Fax +84 24 62 932 369
Email contact@sojielectronics.com
Website sojielectronics.com

Cross-references to other documents.

Revision History

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