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Step-by-Step Hardware Installation and Port 5121 Configuration
The Oigo Telematics series, including the AR-2GM, AR-3HU, and AR-2CX, represents a robust solution for professional fleet management and asset security. Operating primarily on Port 5121, these devices utilize the specialized Oigo protocol to provide high-frequency updates and detailed telemetry. Whether you are deploying the 3G-capable AR-3HU or the stealth-focused AR-2CX transponder, this guide provides the essential technical foundation for wiring, server communication, and advanced driver behavior monitoring.
1. Device Comparison (Port 5121 Models)
| Feature | AR-2GM | AR-3HU | AR-2CX |
|---|---|---|---|
| Network | 2G (GSM/GPRS) | 3G (UMTS/HSPA) | 2G/CDMA Hybrid |
| Form Factor | Standard Slim | Standard Slim | Ultra-Thin Stealth |
| Key Use Case | General Fleet | High-Speed Data | Asset Recovery |
2. Technical Wiring Diagram (8-Pin Interface)
Standard pinout for AR-2GM and AR-3HU connectors:
- Pin 1 (Red): Positive Power (+) 7V – 28V DC
- Pin 2 (Black): Ground (GND) (-)
- Pin 3 (White): Ignition Detection (ACC)
- Pin 4 (Yellow): Relay Control (Output/Immobilizer)
- Pin 5-6 (Green/Blue): UART RX/TX (Serial)
- Pin 7-8 (Orange/Brown): GPIO / Digital Inputs
3. Essential SMS Configuration
Default Password: 000000
| Action | SMS Command | Description |
|---|---|---|
| Set Server IP | W000000,012,XXX.XXX.XXX.XXX,5121 | Points device to your server IP on Port 5121. |
| Set APN | W000000,011,your.apn.name | Configures mobile data settings. |
| Interval | W000000,014,60 | Sets reporting frequency (e.g., 60 seconds). |
4. Advanced Telemetry: Harsh Driving & Towing
Activate these features to monitor driver safety and unauthorized vehicle movement.
| Alert Type | SMS Command | Configuration Logic |
|---|---|---|
| Harsh Braking | W000000,031,1,X | Triggers report on rapid deceleration. |
| Harsh Accel | W000000,032,1,X | Triggers report on rapid acceleration. |
| Towing Alert | W000000,035,1 | Alerts if movement occurs while Ignition is OFF. |
| Impact Alert | W000000,034,1,X | Collision detection based on G-force (X). |
Recommended Threshold Values (X) for Calibration:
- Passenger Cars (Soft Suspension): 0.35G – 0.45G (Value: 35-45)
- Vans / Light Trucks: 0.30G – 0.40G (Value: 30-40)
- Heavy Trucks / Cargo: 0.20G – 0.30G (Value: 20-30)
- Impact Detection: 1.5G+ (Value: 150+)
Note: Values are often entered as milli-G or scaled decimals depending on the firmware version. Always test with a pilot vehicle.
