The Sumith's Diksuchi-3366A Vehicle Mounted Unit (VMU) has built-in GSM and GPS modules which provide real time information of the vehicle. It detects next stop, arriving stop and current stop, displays text on the internal display board and also makes audio announcement. It sends selected route information to outer LED display boards for passengers. The VMU sends real time location information, alerts/SoS etc., to the back-end servers which in turn can be used to generate reports required.



Functional Diagram

Technical Specifications


  • Automatic Vehicle Location. Sends location information to back-end server at periodic intervals
  • Stores up to 150K way points in case of loss of communication and it will be intact when VMU is switched OFF or during the power failures. The VMU sends stored data once communication link is established along with current location information
  • Three modes of communication: SMS, GPRS and both SMS & GPRS( fall back option in case of GPRS failure)
  • Alerts
    •  Over Speed 
    •  Harsh Break 
    •  Internal Battery Low
    •  Ignition/Engine ON/OFF ( using Digital Input)
    •  SoS ( using Digital Input/ Keypad)
    •  Harsh Acceleration
    •  Main Power Status
  • Two way voice communication for pre-configured numbers
  • Supports more than 500 routes with >50 stops/route
  • Automatically gets the schedule information from servers.
  • Automatically selects the trip/route start and stop as per the schedule and sends same to back office server.
  • Vehicle Health Monitoring and Status using CAN
  • Over The Air Firmware up-gradation and configuration
  • 4 - Digital Inputs, 4 - Digital Outputs, and 4 - Analog Inputs
  • External Antenna for GSM/GPS
  • Blue tooth (BT3.0) with external antenna
  • Driver performance
  • Built-in Two Channel (40W each) amplifier with Mic Interface
  • 4 to 8 hours battery backup. No support of Audio if unit is on battery mode
  • Automation audio announcement of stop's and text message display on Internal LED Display Board
  • File uploading using USB
  • Confirms to IP65
  • Driver Login/ Logout Using RFID or Password Key

Functional Diagram


Technical Specification

Microcontroller: 32-bit Microcontroller
Memory: 512 Kbyte Flash, 64/128Kbyte RAM, Up to 16GB Storage Memory(SD Card)
LCD: 128x64 pixel Graphical LCD with white LED
Keypad: Alphanumeric Keypad with Navigational Keys, Pre load Keys, functional keys, Volume Control Keys, OK Key, Cancel Key, and Emergency(SOS) Key
Display Board Interface : 
RS485: Baudrate 115.2 bps
Half/ Full Duplex Mode
RS232: Baudrate 9600 bps
Standard Application
Configuration & Management
Same port can be used for different applications such as RFED Input
Digital Inputs Number of Inputs: 4; Voltage Range: 6V to 39V
Digital Outputs Number of Inputs: 4; Voltage Range: 9V to 39V
Analogue Inputs Number of Inputs: 4; Voltage Range: 0V to 50V
CAN 2.0B
Bluetooth 3.0
USB 2.0 Full Speed
GSM/GPRS Quad-Band 850/ 900/ 1800/ 1900 MHZ
GPRS multi-slot class 10/8; GPRS mobile station class B
Compliant to GSM phase 2/2+
Class 4 (2 W @850/ 900 MHZ); Class 1 (1 W @ 1800/1900MHz)
GPS 22 Tracking/66 acquisition-channel, up to 210 primary channels
Sensitivity: Acquisition: -148 dBm, Navigation: -160 dBm, Tracking: - 163 dBm, Horizontal Accuracy < 2.5m CEP, Velocity Accuracy: 0.1 m/s, Acceleration Accuracy: 0.1 m/s2
Time to Fix: Hot start < 1 sec, Warm Start: 30 sec Cold Start: 32 sec
Audio Built-in 80W Audio Amplifier.
Two channels, each 40W, and Mic Interface
2 - way Voice Communication Hands Free Voice Interface
Power Supply 9V to 39V DC
Current with Audio @ 24V DC: 3A ( Max), 1.5A ( Typical)
Current without Audio @ 24VDC: 800 mA ( Max), 250 mA (Typical)
Protection: Cranking ( Over voltage and Under voltage), Reverse polarity protection, Input short circuit protection
Built-in battery backup ( Lithium-Ion 3.7V 1000mAH/1800 mAH )
Mechanicals Rugged construction with Aluminum and Powder Coated, Vibration Proof
162mm (D) x 200mm (W) x 50mm (H), Confirms to IP65
Operating Temperature -10°C to +80°C
Humidity 5% to 98% RH


Diksuchi 3366 A


  • Intelligent Transport System
  • Vehicle Tracking System
  • Bus Passenger Information System

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