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Ulbotech T-Series Protocol (Port 5072) Integration Guide
Ulbotech trackers are high-performance telematics units specializing in OBDII/CAN-bus data and analog sensor monitoring. All models below utilize the 5072 communication port.
1. Device Comparison Table
| Model | Interface | Core Features | Applications |
|---|---|---|---|
| T370 / T371 | OBDII / Hardwire | 4G LTE, CAN-bus, Fuel Monitoring, FOTA | Heavy Fleet, Logistics |
| T303 / T301 | Hardwire | Analog (AD) Input, Immobilizer, Garmin FMI | Cold Chain, Specialized Assets |
| T360 / T361 | OBDII Plug | Easy Install, Internal Antennas, Driver Behavior | Leasing, Insurance (UBI) |
| T366 | OBDII / WIFI | Dual-mode GPRS/WIFI, 2-Week Data Storage | Remote Areas, High-Security Fleet |
2. Technical Wiring Diagrams
A. T303 Hardwire Pinout
– PIN 1 (RED) : Power Supply (+) 9V – 100V
– PIN 2 (BLACK) : Ground (-)
– PIN 3 (ORANGE) : Ignition (ACC) Detection
– PIN 4 (YELLOW) : Relay Output (Engine Cut-off)
– PIN 5 (GREEN) : AD1 Input (Analog Fuel/Temp Sensor)
– PIN 6 (WHITE) : Digital Input / SOS Button
B. T370/T360 OBDII Pinout
– PIN 4 & 5 : Ground (Chassis & Signal)
– PIN 6 (CAN H) : ISO 15765-4 High Speed
– PIN 14 (CAN L) : ISO 15765-4 Low Speed
– PIN 16 : Permanent Power (+) 12V/24V
3. SMS Configuration Commands
Default Password: 6666 (Replace with your actual password if changed).
2. Set APN: APN,6666,apn_name,apn_user,apn_pass#
3. Set Timer: TIMER,30,300# (30s moving, 300s standing)
4. Check Status: STATUS#
4. Fuel Sensor Calibration (Specific Steps)
Calibration is critical for converting raw analog voltage (0-5V) into liters or percentage. Follow these steps for Analog (AD) or Ultrasonic sensors.
A. SMS Calibration Procedure
Send these commands sequentially as you fill or empty the tank. The device will reply with the measured value (e.g., (100, XX) where XX is the raw sensor value).
2. Fill to 75%: A000000,017,75 (Device returns raw value for 75%)
3. Fill to 50%: A000000,017,50 (Device returns raw value for 50%)
4. Fill to 0%: A000000,017,0 (Device returns raw value for Empty)
B. Manual Table Entry (Example Data)
Record the values from the SMS replies and enter them into your Tracking Platform’s calibration section:
| Calibration Point | Raw Value (from Device) | Actual Liters (Tank Capacity 100L) |
|---|---|---|
| Empty Tank | 102 | 0 L |
| Quarter Tank | 345 | 25 L |
| Half Tank | 610 | 50 L |
| Full Tank | 980 | 100 L |
5. Conclusion
By correctly wiring the AD input (Green wire) and performing the SMS calibration sequence, Ulbotech trackers provide professional-grade fuel monitoring on Port 5072.
