5.3.1 System Configuration Window Overview

The System Configuration window has the following functions:
  • Displays specific software information
  • Reports the status of the learned fobs
  • Selects the PEPS authentication method
  • Set the threshold values for inside/outside detection and relay attack
  • Selects a PEPS fob to perform testing
  • To set the calibration values and provide an interface to read/write user data in each selected fob
In the Car Access System PC Application window, navigate to View > System Configuration to open the System Configuration window (see the following figure).
Figure 5-4. System Configuration Window

The System Configuration window contains the following sections and associated data fields:

  • “LF Antennas” – This section includes controls used to select the antenna channel, the current and associated vehicle ID.
    • “Antenna Channel” – Selecting any of these radio buttons assigns which antenna channel is used to send the LF message from the vehicle. The Ant connector number on the board starts at Ant0 while the antenna channel displayed on the CARS PC application starts with antenna channel 1. As a result, antenna channel 1 on the PC application corresponds with Ant0 on the board. This offset count continues for all six antenna channels.
      Note:

      • When using the ATA5291-XPRO and antenna channel 1, ensure that the J1 jumper on the LF antenna module is set to the inductor only () position. When channels 2 through 6 are used, ensure the J1 jumper on the LF antenna module is set to the LCR option.

      • When using the ATA5293-XPRO and antenna channel 1, the X-10013-002 antenna is required. When antenna channels 2 through 5 are used, the X-10013-003 antenna is required; channel 6 is not used within the PC application.

    • “Antenna Current” – This drop-down list determines the amount of current flowing in the LF antenna during the LF message. This is directly related to the field strength at a given distance from the antenna. Therefore, any change to this value has a direct impact on the performance of the localization during PEPS.
    • “Vehicle ID” – Sets the wake-up value transmitted with the LF message. Only fobs that are looking for this value wake up and respond. The vehicle ID is set in the fob during the learn procedure and is user-definable.
  • “Learned Fobs” – This section lists up to four individual fob IDs paired with the system and saved in memory.
    • “LF Learn” – This button performs the initial pairing of any new fobs to the system using the immobilizer LF field provided by the LF antenna. For details on the learn procedure, see Initial Configuration of the CARS Kit PC Evaluation Utility .
    • “Clear” – This button erases all the saved fob secret keys and configuration data from the system memory.
      Note: The system does not have full functionality until a fob is paired.
  • “PEPS Features” – This section includes configuration settings that affect PEPS messaging functions, including the type of authentication during polling, as well as, a polling interval.
    • “Unilateral and Bilateral Authentication” – Selecting either of these radio buttons has an effect on the type of communication used during polling only.
    • “Polling”– Range checking and the determination of a desired threshold performance can easily be done with polling. Selecting this check box starts the polling cycle, which repeats at a rate set in milliseconds.
      Note: 500 ms is the minimum allowable value.
    • “In/Out Threshold” – Determines if a fob is inside or outside of the vehicle by comparing the distance scale result against the in/out threshold value. The boundary value is user-definable and can be specified by entering a new value (1-599) in this field.
    • “Relay Attack Threshold” – Determines if a fob is inside or outside of the vehicle by comparing the UWB distance measurement result against the Relay Attack threshold value. The boundary value is user-definable and can be specified by entering a new decimal value (1-100) in this field.
    • “Priority Fob” – This drop-down list allows users to specify which fob is given priority when responding to a PEPS command following the common slot of the anti-collision process.
  • “PEPS Fob Actions” – This section allows for selection and communication with an individual fob even with other PEPS fobs present.
    • “Selected Fob” – This drop-down list allows direct access to an individual fob. Selecting Broadcast allows communication with any fob, even unlearned ones. This facilitates accessing a fob ID even if the vehicle ID for that specific fob is unknown.
      Figure 5-5. Selected Fob – Broadcast
    • “Fob ID” – This button provides a way to access the current fob ID, the vehicle ID and the battery status.
    • “S/W Ver” – This button requests the current fob software version.
    • “Low Bat” – This check box is selected by the software if the battery voltage in the current fob is below the low battery threshold (approximately 2.6V).
    • “Fob Vehicle ID” – Displays the vehicle ID stored within the current fob.
    • “LF Test” – This tab displays all the details relating to a test LF field measurement. Details such as the external, internal RSSI values and coil phase clock counts display here. The distance scale value is determined by the combined result of all post-RSSI processing. In a standard PEPS message, the distance scale and the coil phase values are sent.
    • “Parameter Access” – This tab displays general user memory sections of the fob EEPROM that can be accessed via the PEPS system link. These are configured into 32 blocks of memory with each block having 16 bytes of data available. The data can be displayed in HEX or ASCII format. To access the memory, the fob must first be put into a password-protected Diagnostic mode by clicking the Enter Diag button. Then, for several seconds, the fob responds to read or write commands.
      Figure 5-6. Parameter Access
    • “Calibrate Fob” – This button initiates a calibration cycle, which provides reference values as each fob LF antenna coil axis has slightly different gains due to the antenna coil, capacitor and IC tolerances. This is typically done at the end-of-line testing by the manufacturer and is necessary to achieve consistent results. It only needs to be performed once for each fob. For details on the calibration procedure, see Fob Calibration Overview.