Wired BLE Relay Installation Guide
Installation Guide: Wired BLE Relay with Asset Trackers
🔹 1. Device Overview
Model: ZenTrack T-Relay (BLE + Wired)
Primary Use Cases: Engine cutoff, fuel pump control, door locks, sirens, AC, seatbelt/door sensors
Control Methods: Bluetooth (via phone or ZenTrack), Wired (via digital input/output)
🔹 2. Wiring Diagram & Color Codes
Function | Wire Color | Terminal |
Power Input (VIN) | Red | - |
Ground (GND) | Black | - |
Relay - NO | Red | 87 |
Relay - Common | Black | 30 |
Relay - NC | Blue | 87a |
Digital Input (ACC) | Yellow | DIN |
Negative DOUT 1 | Gray | Output 1 |
Negative DOUT 2 | Brown | Output 2 |
Control Input | Blue | Relay control |
Status Output | Green | Relay feedback |

🔹 3. Installation Steps
✅ Powering ON
Connect Red (VIN) to vehicle power (7V–60V).
Connect Black (GND) to vehicle ground.
No internal battery – device turns off when power is cut.
✅ Bluetooth Setup (TFTBLE App)
Download the TFTBLE App:
Turn on Bluetooth & open the app.
Scan for T-relay device or scan the QR code on the label.
Default password: 654321
Use the Config menu to:
View status
Trigger relay manually
Update firmware
✅ Tracker Integration
Option A: Wired
Option B: BLE
Ensure the tracker supports BLE.
Retrieve T-relay MAC address from TFTBLE app or QR.
Add sensor MAC to tracker config.
Set tracker BLE reporting interval.
🔹 4. LED Indicators
LED | Color | Status | Meaning |
BLE | Blue | Solid ON | Connected |
Relay | Green | Solid ON | Relay activated |
Power | Red | Solid ON | Power connected |
🔹 5. Troubleshooting Guide
Issue | Solution |
TFTBLE shows "Loading" | Restart app, grant permissions, bring phone close to relay |
App can't find relay | Check power supply, verify BLE is on, scan QR code manually |
Relay not triggering via tracker | Check wiring or MAC ID configuration in tracker |
Package | Details |
Assets Supported | 500–750 assets |
Users Included | 5 (expandable) |
QR Tags | 500 pre-printed, industrial-grade |
BLE Tags (optional) | Available upon request |
Deployment | Cloud-based, quick onboarding |
Delivery | Within 7–10 business days (UAE) |
Training | Self-serve + virtual onboarding session |
Support | UAE-based, phone/email support |
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