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At Road iLM 2500 Operational Manual

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iLM 2500 Operational Description

The iLM 2500 Internet Location Modem combines GPS with a wireless data modem to provide
vehicle location specific information. The intended use is to monitor location, speed and travel
direction of vehicles. It is also designed to monitor PTO and activity based events such as
ignition status, door open/close and tow lifts. It provides a serial interface for computers and
peripheral devices like a printer, smart card reader, bar code scanner and temperature sensor.
Automatic Vehicle Location (AVL) System Diagram

System Description

The iLM2500 has a GPS receiver, which receives location specific information from satellites.
The GPS engine translates the receiving signal into data information and passes it on to the CPU.
The CPU computes vehicle location, based on the information received. The location data is sent
to the Rover Server/Database over the CDPD network. The information is retrieved via the
Internet. The data is updated at intervals defined by the user.

Hardware Description

The Main components used in iLM2500 design include Motorola's MC68331 processor, Flash,
rd
Sram, Vista chip set from @Road, RTC/System Controller, and various different 3
party
CDPD OEM modules. Power to the system is drawn from a vehicles +12VDC source. A few
voltage regulators use this source to generate power and supply it to different areas on the PCB.
The iLM2500 has a backup battery feature. The backup battery kicks in automatically when the
main power falls below operating voltage or is absent. The power supplied to external devices
via Data Port 1 and Data Port 2 can be switched ON/OFF by the CPU. This was added to
enhance power management.

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Summary of Contents for At Road iLM 2500

  • Page 1 2500 Operational Description The iLM 2500 Internet Location Modem combines GPS with a wireless data modem to provide vehicle location specific information. The intended use is to monitor location, speed and travel direction of vehicles. It is also designed to monitor PTO and activity based events such as ignition status, door open/close and tow lifts.

  • Page 2: System Architecture

    System Architecture Motorola’s MC68331 processor is used as the main controller of the system. It runs at 16Mhz, which is generated from an external 32.768Khz crystal. The CPU interfaces with flash memory, SRAM, GPS Asic and other I/Os in the system. An internal watchdog timer is used to generate the system reset.
  • Page 3 Vista    GPS Chipset An @Road proprietary chipset comprised of two chips, GPS Signal Processing ASIC (VGP-12) and RF ASIC (VRF-12). GPS Signal Processing ASIC VGP-12 is the GPS Digital ASIC that combines twelve satellite correlator channels with other GPS system control peripherals.
  • Page 4 PTO I/Os These I/Os allow a customer to monitor up to 4 contact-based switch events. The iLM can be programmed to transmit additional points when a switch transition occurs. Each time a switch transition, ON!OFF or OFF!ON occurs, an update is transmitted to the server. Relay Drivers There are two +12VDC relay drivers that can be used to turn ON/OFF the external relays.
  • Page 5 Specifications: Dimensions: 5.0” x 3.5” x 0.8” (127mm x 89mm x 20mm) (LWD) Weight: 0.72 pounds (270 grams) Electrical: Input Voltage: 10 to 24V DC Input Current: 340mA at 12V DC Voltage Spikes: Up to 30V DC for 0.1 second Current Consumption: Standby: <1mA at 12V DC Operating: 310mA...

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