User's Manual

System Architecture Overview

The UIT communicates with the vehicle-charging cradle via a 3DES Encrypted Bluetooth-

compatible interface (wireless) or a serial (RS-485) connection if wireless connectivity is

unavailable or prohibited (software configurable). Once a wireless connection has been

established from the UIT to the cradle, SNAP (Scaleable Node Address Protocol) is used for

passing data between the UIT and other devices on the SNAP bus. Currently, these devices

include the receipt printer, the Truck Interface Module (TIM), and the vehicle-charging

cradle. The UIT is also capable of docking in the desktop cradle to form an ActiveSync

connection via USB with the central controller. The receipt printer is a node on the SNAP

bus, for which all decoding of data packets is done within the vehicle-charging cradle and

sent to the printer via RS-232. The printer can receive data from any device on the SNAP

bus. The TIM is connected to the vehicle-charging cradle via RS-485 and is another node

on the SNAP bus. The truck charger simply passes data between the UIT and printer to the

TIM. The decoding of SNAP packets destined for the TIM is done within the TIM itself.

To communicate with the central controller, the TIM establishes a PPP connection to the

TCP/IP router via its 2.4GHz radio. The router then forwards the packets retained in the

TIM to the central controller via a TCP/IP over USB connection.

Functional Description

User Interface Terminal (UIT) – a handheld device for inputting data from the user,

magnetic stripe card, Prokee® and other source media. It is also a terminal for executing,

configuring, and monitoring a fuel transaction via the TIM.

Vehicle-Charging Cradle – routing device for directing data packets between the TIM,

UIT and the printer using SNAP over either RS-485 or Bluetooth. This device also provides

power to the UIT for charging and operation.

Printer – printing device used to print transaction receipts. It can receive data from both the

TIM and UIT through the vehicle charging cradle.

Truck Interface Module (TIM) – Establishes and maintains a connection to the UIT and

central controller to account for fueling transaction data by monitoring the accumulated fuel

quantity and temperature. It controls all external interfacing to the truck and fueling

equipment including the hose(s) and pulser(s). Transactions reside here and are uploaded to

the central controller via a 3DES Encrypted internal 2.4 GHz radio. The TIM also provides

power to the printer, vehicle-charging cradle and other devices.

Base Station (PC/RF Assembly) – houses the 2.4 GHz radio for the central controller

and the Converter Box, which provides power and a logical interface to the radio box from

the computer’s serial port and an auxiliary power supply.

TCP/IP router – routes data from multiple (New) ADC TIMs to the USB port on the

Central Controller. Also routes (Legacy) ADC/FDS TIM data to the serial port of Central

Controller for legacy ADC support.