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<h1>12. Preference Window</h1>
<h1><span class="section-number">12. </span>Preference Window<a class="headerlink" href="#preference-window" title="Permalink to this headline"></a></h1>
<p>.</p>
<img alt="_images/Preferences.png" src="_images/Preferences.png" />
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<div class="section" id="setting-preferences">
<h1>13. Setting Preferences</h1>
<h1><span class="section-number">13. </span>Setting Preferences<a class="headerlink" href="#setting-preferences" title="Permalink to this headline"></a></h1>
<p>There are a variety of preferences that can be set in the program and persisted for future sessions.</p>
<p>“Save/Restore window positions and sizes”: If this is set then the size and placement of the various windows in this application will be saved when the program is closed and loaded when each window is brought back up in the future. This can be used to create your own preferred layout. If you’d rather things come up in their default state every time then you can uncheck this box.</p>
<p>“Display values as hexadecimal”: A lot of the time people who are doing CAN reverse engineering like to see values in hexadecimal (base 16) instead of the more familar decimal (base 10) system. Checking this box will cause most of the values in the application to show up in hex. This applies to CAN ids and data bytes. Unchecking this causes values to default to decimal instead. The reason for using hex is that each hex digit is 4 bits. Integers on a computer tend to be in multiples of 8 - 8, 16, 32, 64. So, hex digits have a direct mapping to the underlying binary. Decimal does not have this correspondance AT ALL. But, the choice is yours.</p>
<p>“Display values as hexadecimal”: A lot of the time people who are doing CAN reverse engineering like to see values in hexadecimal (base 16) instead of the more familiar decimal (base 10) system. Checking this box will cause most of the values in the application to show up in hex. This applies to CAN ids and data bytes. Unchecking this causes values to default to decimal instead. The reason for using hex is that each hex digit is 4 bits. Integers on a computer tend to be in multiples of 8 - 8, 16, 32, 64. So, hex digits have a direct mapping to the underlying binary. Decimal does not have this correspondence AT ALL. But, the choice is yours.</p>
<p>“Require validation of GVRET connection”: GVRET style devices run over a serial connection. Serial connections can be finicky sometimes and so the connection can be validated to prove that everything is really still operating and talking. There probably isn’t any reason to turn this off except while debugging to see if it changes anything. Mostly just don’t touch this.</p>
<p>“Time Keeping”: There are a variety of ways one could timestamp CAN frames as they come into the program. Selecting “Seconds” will cause the timestamp to be expressed as seconds since the frame list was last cleared. This tends to be an easy choice to work with. “Microseconds” will express the timestamp as millionths of a second since the last time the frame list was cleared. This is exactly like “Seconds” mode but without any decimal point. You might find this to be a bit hard to conceptualize. The last option is “System Clock” this will timestamp frames with the current system time when the frame came in. This is still very precise but now you’ll get an absolute time stamp with the full date and time. The display of this mode can be changed by editing the “Time Format String” value. It defaults to an output that looks like “JAN-10 12:34:53.234” But you can set it to other values. Look here to find a reference for how you can create new format strings: <a class="reference external" href="http://doc.qt.io/qt-4.8/qdatetime.html#toString">http://doc.qt.io/qt-4.8/qdatetime.html#toString</a></p>
<p>“Use filtered frames in sub-windows”: The main window has a filtering interface where you can uncheck IDs to hide them. Ordinarily when you bring up one of the other windows it will still use the main unfiltered list. Sometimes you really do want to deal with the filtered list of frames even in the other windows. If this is checked then the other windows will see the filtered list and not the unfiltered actual list of frames that have been captured.</p>
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<li class="toctree-l1"><a class="reference internal" href="mainscreen.html">1. Main / Start Up Screen</a></li>
<li class="toctree-l1"><a class="reference internal" href="mainscreen.html#the-main-frame-list">2. The Main Frame List</a></li>
<li class="toctree-l1"><a class="reference internal" href="mainscreen.html#the-bottom-statusbar">3. The Bottom Statusbar</a></li>
<li class="toctree-l1"><a class="reference internal" href="mainscreen.html#the-rest-of-the-main-window">4. The Rest of the Main Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="mainscreen.html#loading-and-saving-frames">5. Loading And Saving Frames</a></li>
<li class="toctree-l1"><a class="reference internal" href="mainscreen.html#filters">6. Filters</a></li>
<li class="toctree-l1"><a class="reference internal" href="mainscreen.html#what-is-dbc-and-why-would-i-care">7. What is DBC and why would I care?!</a></li>
<li class="toctree-l1"><a class="reference internal" href="mainscreen.html#how-dbc-interacts-with-the-main-screen">8. How DBC interacts with the main screen?</a></li>
<li class="toctree-l1"><a class="reference internal" href="connectionwindow.html">9. Connection Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="connectionwindow.html#connecting-to-a-dongle">10. Connecting To A Dongle</a></li>
<li class="toctree-l1"><a class="reference internal" href="connectionwindow.html#debugging-connection-problems">11. Debugging Connection Problems</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">12. Preference Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="#setting-preferences">13. Setting Preferences</a></li>
<li class="toctree-l1"><a class="reference internal" href="dbc_manager.html">14. DBC File Manager</a></li>
<li class="toctree-l1"><a class="reference internal" href="dbc_manager.html#working-with-dbc-files">15. Working with DBC Files</a></li>
<li class="toctree-l1"><a class="reference internal" href="dbc_manager.html#dbc-file-ordering">16. DBC File Ordering</a></li>
<li class="toctree-l1"><a class="reference internal" href="dbc_editor.html">17. DBC Message Editor</a></li>
<li class="toctree-l1"><a class="reference internal" href="dbc_editor.html#working-with-nodes">18. Working with Nodes</a></li>
<li class="toctree-l1"><a class="reference internal" href="dbc_editor.html#working-with-messages">19. Working with Messages</a></li>
<li class="toctree-l1"><a class="reference internal" href="signaleditor.html">20. DBC Signal Editor</a></li>
<li class="toctree-l1"><a class="reference internal" href="signaleditor.html#defining-and-editing-signals">21. Defining and Editing Signals</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html">22. Graphing Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html#creating-a-new-graph">23. Creating a new Graph</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html#selecting-a-graph">24. Selecting a Graph</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html#editing-a-graph">25. Editing a Graph</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html#deleting-graphs">26. Deleting Graphs</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html#moving-around">27. Moving Around</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html#loading-and-saving-graphs">28. Loading and Saving Graphs</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphwindow.html#real-time-graphing">29. Real Time Graphing</a></li>
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<li class="toctree-l1"><a class="reference internal" href="graphsetup.html">31. Graph Setup</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphsetup.html#setting-up-a-graph">32. Setting up a Graph</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphsetup.html#graphing-a-dbc-signal">33. Graphing a DBC Signal</a></li>
<li class="toctree-l1"><a class="reference internal" href="graphsetup.html#manual-signal-graphing-or-editing">34. Manual Signal Graphing (Or Editing)</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html">35. Flow View Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html#the-purpose-of-flow-view">36. The Purpose of Flow View</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html#selecting-an-id-to-flow">37. Selecting an ID to Flow</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html#viewing-the-flow">38. Viewing the Flow</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html#controlling-the-flow">39. Controlling the Flow</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html#additional-control-options">40. Additional control options</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html#reference-values">41. Reference Values</a></li>
<li class="toctree-l1"><a class="reference internal" href="flowview.html#seeking-to-specific-values">42. Seeking to Specific Values</a></li>
<li class="toctree-l1"><a class="reference internal" href="bisector.html">43. Bisector Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="bisector.html#using-the-bisector-window">44. Using the Bisector Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html">45. Sniffer Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html#using-the-sniffer-window">46. Using the Sniffer Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html#notching-and-unnotching">47. Notching and Unnotching</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html#advanced-options">48. Advanced Options</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html#never-expire-ids">49. Never Expire IDs</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html#mute-notched-bits">50. Mute notched bits</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html#fade-inactive-bytes">51. Fade inactive bytes</a></li>
<li class="toctree-l1"><a class="reference internal" href="sniffer.html#view-bits">52. View Bits</a></li>
<li class="toctree-l1"><a class="reference internal" href="framedetails.html">53. Frame Details Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="framedetails.html#the-purpose-of-frame-details-window">54. The Purpose of Frame Details Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="filecomparison.html">55. File Comparison Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="filecomparison.html#the-purpose-of-the-file-comparator">56. The Purpose of the File Comparator</a></li>
<li class="toctree-l1"><a class="reference internal" href="filecomparison.html#the-layout-of-the-differences-list">57. The layout of the differences list</a></li>
<li class="toctree-l1"><a class="reference internal" href="fuzzingwindow.html">58. Fuzzing Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="fuzzingwindow.html#the-purpose-of-fuzzing">59. The Purpose of Fuzzing</a></li>
<li class="toctree-l1"><a class="reference internal" href="fuzzingwindow.html#fuzzing-is-dangerous">60. Fuzzing is Dangerous</a></li>
<li class="toctree-l1"><a class="reference internal" href="fuzzingwindow.html#controlling-the-fuzzy-beast">61. Controlling the Fuzzy Beast</a></li>
<li class="toctree-l1"><a class="reference internal" href="fuzzingwindow.html#pulling-the-trigger">62. Pulling the Trigger</a></li>
<li class="toctree-l1"><a class="reference internal" href="isotp_decoder.html">63. ISO-TP Decoder</a></li>
<li class="toctree-l1"><a class="reference internal" href="isotp_decoder.html#using-the-iso-tp-decoder">64. Using the ISO-TP Decoder</a></li>
<li class="toctree-l1"><a class="reference internal" href="rangestate.html">65. Range State Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="rangestate.html#using-the-range-state-window">66. Using the Range State Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="uds_scanner.html">67. UDS Scan Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="uds_scanner.html#purpose-of-the-uds-scan-window">68. Purpose of the UDS Scan Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="uds_scanner.html#using-the-uds-scan-window">69. Using the UDS Scan Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="playbackwindow.html">70. Playback Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="playbackwindow.html#preparing-frames-for-playback">71. Preparing Frames for Playback</a></li>
<li class="toctree-l1"><a class="reference internal" href="playbackwindow.html#playing-back-frames">72. Playing Back Frames</a></li>
<li class="toctree-l1"><a class="reference internal" href="playbackwindow.html#playback-status">73. Playback Status</a></li>
<li class="toctree-l1"><a class="reference internal" href="customsender.html">74. Custom Sender Window</a></li>
<li class="toctree-l1"><a class="reference internal" href="customsender.html#general-overview">75. General Overview</a></li>
<li class="toctree-l1"><a class="reference internal" href="customsender.html#layout-of-the-view">76. Layout of the View</a></li>
<li class="toctree-l1"><a class="reference internal" href="customsender.html#writing-trigger-rules">77. Writing Trigger Rules</a></li>
<li class="toctree-l1"><a class="reference internal" href="customsender.html#writing-modifications">78. Writing Modifications</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html">79. Scripting Interface</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#purpose-of-the-scripting-interface">80. Purpose of the Scripting Interface</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#managing-scripts">81. Managing Scripts</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#getting-script-status">82. Getting Script Status</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#writing-scripts">83. Writing Scripts</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#callback-functions">84. Callback Functions</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#the-host-object">85. The host Object</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#the-can-object">86. The can Object</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#the-isotp-object">87. The isotp Object</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#the-uds-object">88. The uds Object</a></li>
<li class="toctree-l1"><a class="reference internal" href="scriptingwindow.html#a-full-example-script">89. A full example script</a></li>
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