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<!--
Main page of the CAN overhead calculator.
Published under the terms of the BSD 3-Clause license.
See LICENSE.md for details.
-->
<!DOCTYPE html>
<html lang=en-US>
<head>
<meta charset=utf-8>
<title>CAN overhead, stuffing and bitrate calculator</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="author" content="Nicola Furlan, Matjaž Guštin"/>
<link rel="license" href="license.html"/>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<h1 id="main_title">
CAN overhead, stuffing and bitrate calculator
</h1>
<noscript id="noscript_warning">
<hr/>
<h3>
Please enable JavaScript for this website to work.
</h3>
<div>
If you don't trust the code (some paranoia is always good!),
you can inspect it first on
<a href="https://github.com/Nik89/CanOverhead">GitHub</a>.
The page works offline (no data is transmitted to any server),
so alternatively you can download the files and open the
<i>index.html</i> file in your browser even when not connected to the
internet.
</div>
<hr/>
</noscript>
<div id="input_form">
<div class="input">
<div id="input_frame_type_block">
<label for="input_frame_type">Frame type</label>
<select name="input_frame_type" id="input_frame_type"
class="dropdown_select" onchange="alterInputFormOnFrameTypeChange(this)">
<option value="can_data11" selected>Base data frame (11-bit ID)</option>
<option value="can_data29">Extended data frame (29-bit ID)</option>
<option value="can_rtr11">Base RTR frame (11-bit ID)</option>
<option value="can_rtr29">Extended RTR frame (29-bit ID)</option>
<option value="canfd_data11" hidden>FD base data frame (11-bit ID)</option>
<option value="canfd_data29" hidden>FD extended data frame (29-bit ID)</option>
</select>
</div>
<div id="input_can_identifier_block">
<label for="input_can_identifier">Frame identifier</label>
<input id="input_can_identifier"
name="input_can_identifier"
class="input_text"
type="text" placeholder="42" autofocus/>
<label for="input_can_identifier_base"
class="small_label">in base</label>
<select name="input_can_identifier_base"
id="input_can_identifier_base"
class="dropdown_select">
<option value="0b">Bin</option>
<option value="">Dec</option>
<option value="0x" selected>Hex</option>
</select>
</div>
<div id="input_can_payload_block">
<label for="input_can_payload">
Frame payload data
</label>
<span class="small_label">
(hex-only, ignoring spaces, commas and '0x' prefixes)
</span>
<input id="input_can_payload"
name="input_can_payload"
class="input_text"
type="text" placeholder="43 41 4E"/>
</div>
<div id="input_can_dlc_block">
<label for="input_can_dlc">RTR frame Data Length Code (DLC)</label>
<span
title="This should be the payload length of the frame transmitted by the receiver(s) of the RTR frame. RTR frames themselves have no payload."
class="help_popup">ⓘ
</span>
<select name="input_can_dlc" id="input_can_dlc"
class="dropdown_select">
<option value="0" selected>0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
</select>
</div>
<div id="input_can_bitrate_block">
<label for="input_can_bitrate">CAN bitrate</label>
<span
title="In KILObit (multiples of 1000), not KIBIbit (multiples of 1024)"
class="help_popup">ⓘ
</span>
<select name="input_can_bitrate" id="input_can_bitrate"
class="dropdown_select">
<option value="5e6">5 Mbit/s</option>
<option value="2e6">2 Mbit/s</option>
<option value="1e6">1 Mbit/s</option>
<option value="800e3">800 kbit/s</option>
<option value="500e3">500 kbit/s</option>
<option value="250e3">250 kbit/s</option>
<option value="125e3" selected>125 kbit/s</option>
<option value="50e3">50 kbit/s</option>
<option value="20e3">20 kbit/s</option>
<option value="10e3">10 kbit/s</option>
<option value="5e3">5 kbit/s</option>
</select>
</div>
<div id="input_error" class="input-error"></div>
</div>
<div class="buttons">
<button class="button" onclick="calculate()">Compute</button>
</div>
<div class="output">
<h4 id="output_list_title" class="output_section_title">
Whole frame
</h4>
<ul id="output_list">
<li>Whole frame without stuff bits
<span id="output_can_whole_frame_len"></span>
<div id="output_can_whole_frame"
class="output_can_text"></div>
</li>
<li>Whole frame with stuff bits
<span class="small_label">
(as appears on the bus)
</span>
<span id="output_can_whole_frame_stuffed_len"></span>
<div id="output_can_whole_frame_stuffed"
class="output_can_text"></div>
</li>
<li>Worst-case frame length after stuffing
<span class="small_label">
(assuming same ID and payload lengths)
</span>
<span
title="Some bit sequences require more stuff bits than others. If the CAN ID and also the payload of the same size as the provided inputs but their contents are the worst possible (in terms of stuffing requirements), this is the length of the whole frame after the stuffing."
class="help_popup">ⓘ
</span>
<div id="output_max_length" class="output_can_text"></div>
</li>
<li>Whole frame transfer time
<span class="small_label">
(including stuff bits)
</span>
<span
title="The time it takes to transfer the whole stuffed frame across the bus at the given bitrate, from the Start Of Frame bit (included) until the very first moment the next frame could be transmitted (next SOF excluded)."
class="help_popup">ⓘ
</span>
<div id="output_transfer_time" class="output_can_text"></div>
</li>
<li>Overhead
<span class="small_label">
(including stuff bits)
</span>
<span
title="Overhead = metadata-only bits / all bits. As the CAN ID may be itself already useful data and not only metadata (e.g. indicate a specific command for the receivers), an option where the ID is considered part of the metadata (thus adding to the overhead) is given as well as one where the ID is considered part of the data (thus not adding to the overhead)."
class="help_popup">ⓘ
</span>
<div id="output_overhead_no_id" class="output_can_text"></div>
<div id="output_overhead_with_id" class="output_can_text"></div>
</li>
<li>Effective bitrate to transfer the data
<span class="small_label">
(including stuff bits)
</span>
<span
title="Effective bitrate = data-only bits / whole frame transfer time. It is the bitrate at which the data is effectively transferred across the bus in case of continuous frame-after-frame transmission of the same frame. The same considerations for CAN ID as data or as metadata apply as for the Overhead field."
class="help_popup">ⓘ
</span>
<div id="output_effective_bitrate_no_id" class="output_can_text"></div>
<div id="output_effective_bitrate_with_id" class="output_can_text"></div>
</li>
</ul>
<h4 id="output_table_title" class="output_section_title">
Breakdown of frame fields
</h4>
<table class="output_table" id="output_table_data11bit">
<tr>
<th>#</th>
<th>Field name</th>
<th>Length<br/>[bits]</th>
<th>Content<br/>[bin]</th>
<th>Content<br/>[hex]</th>
</tr>
<tr>
<td>1</td>
<td class="cell_text">Start of Frame (SOF)</td>
<td id="output_can_data11_field01_len"></td>
<td id="output_can_data11_field01"></td>
<td id="output_can_data11_field01_hex"></td>
</tr>
<tr>
<td>2</td>
<td class="cell_text">Identifier (ID)</td>
<td id="output_can_data11_field02_len"></td>
<td id="output_can_data11_field02"></td>
<td id="output_can_data11_field02_hex"></td>
</tr>
<tr>
<td>3</td>
<td class="cell_text">Remote Transfer Request (RTR)</td>
<td id="output_can_data11_field03_len"></td>
<td id="output_can_data11_field03"></td>
<td id="output_can_data11_field03_hex"></td>
</tr>
<tr>
<td>4</td>
<td class="cell_text">Identifier Extension (IDE)</td>
<td id="output_can_data11_field04_len"></td>
<td id="output_can_data11_field04"></td>
<td id="output_can_data11_field04_hex"></td>
</tr>
<tr>
<td>5</td>
<td class="cell_text">Reserved 0 (R0)</td>
<td id="output_can_data11_field05_len"></td>
<td id="output_can_data11_field05"></td>
<td id="output_can_data11_field05_hex"></td>
</tr>
<tr>
<td>6</td>
<td class="cell_text">Data Length Code (DLC)</td>
<td id="output_can_data11_field06_len"></td>
<td id="output_can_data11_field06"></td>
<td id="output_can_data11_field06_hex"></td>
</tr>
<tr>
<td>7</td>
<td class="cell_text">Data (Payload)</td>
<td id="output_can_data11_field07_len"></td>
<td id="output_can_data11_field07"></td>
<td id="output_can_data11_field07_hex"></td>
</tr>
<tr>
<td>8</td>
<td class="cell_text">Cyclic Redundancy Check (CRC)</td>
<td id="output_can_data11_field08_len"></td>
<td id="output_can_data11_field08"></td>
<td id="output_can_data11_field08_hex"></td>
</tr>
<tr>
<td>9</td>
<td class="cell_text">CRC Delimiter</td>
<td id="output_can_data11_field09_len"></td>
<td id="output_can_data11_field09"></td>
<td id="output_can_data11_field09_hex"></td>
</tr>
<tr>
<td>10</td>
<td class="cell_text">Acknowledgement (ACK) Slot
<span
title="Set to 1 by transmitted, pulled to 0 by receiver(s) to acknowledge."
class="help_popup">ⓘ
</span>
</td>
<td id="output_can_data11_field10_len"></td>
<td id="output_can_data11_field10"></td>
<td id="output_can_data11_field10_hex"></td>
</tr>
<tr>
<td>11</td>
<td class="cell_text">Acknowledgement Delimiter</td>
<td id="output_can_data11_field11_len"></td>
<td id="output_can_data11_field11"></td>
<td id="output_can_data11_field11_hex"></td>
</tr>
<tr>
<td>12</td>
<td class="cell_text">End of Frame (EOF)</td>
<td id="output_can_data11_field12_len"></td>
<td id="output_can_data11_field12"></td>
<td id="output_can_data11_field12_hex"></td>
</tr>
<tr>
<td>13</td>
<td class="cell_text">Inter-Frame Space (IFS)
<span
title="Minimum silence required between 2 consecutive frames."
class="help_popup">ⓘ
</span>
</td>
<td id="output_can_data11_field13_len"></td>
<td id="output_can_data11_field13"></td>
<td id="output_can_data11_field13_hex"></td>
</tr>
</table>
<table class="output_table" id="output_table_data29bit">
<tr>
<th>#</th>
<th>Field name</th>
<th>Length<br/>[bits]</th>
<th>Content<br/>[bin]</th>
<th>Content<br/>[hex]</th>
</tr>
<tr>
<td>1</td>
<td class="cell_text">Start of Frame (SOF)</td>
<td id="output_can_data29_field01_len"></td>
<td id="output_can_data29_field01"></td>
<td id="output_can_data29_field01_hex"></td>
</tr>
<tr>
<td>2</td>
<td class="cell_text">Identifier part A (ID A)</td>
<td id="output_can_data29_field02_len"></td>
<td id="output_can_data29_field02"></td>
<td id="output_can_data29_field02_hex"></td>
</tr>
<tr>
<td>3</td>
<td class="cell_text">Substitute Remote Request (SRR)</td>
<td id="output_can_data29_field03_len"></td>
<td id="output_can_data29_field03"></td>
<td id="output_can_data29_field03_hex"></td>
</tr>
<tr>
<td>4</td>
<td class="cell_text">Identifier Extension (IDE)</td>
<td id="output_can_data29_field04_len"></td>
<td id="output_can_data29_field04"></td>
<td id="output_can_data29_field04_hex"></td>
</tr>
<tr>
<td>5</td>
<td class="cell_text">Identifier part B (ID B)</td>
<td id="output_can_data29_field05_len"></td>
<td id="output_can_data29_field05"></td>
<td id="output_can_data29_field05_hex"></td>
</tr>
<tr>
<td>6</td>
<td class="cell_text">Remote Transfer Request (RTR)</td>
<td id="output_can_data29_field06_len"></td>
<td id="output_can_data29_field06"></td>
<td id="output_can_data29_field06_hex"></td>
</tr>
<tr>
<td>7</td>
<td class="cell_text">Reserved Bit 1 (R1)</td>
<td id="output_can_data29_field07_len"></td>
<td id="output_can_data29_field07"></td>
<td id="output_can_data29_field07_hex"></td>
</tr>
<tr>
<td>8</td>
<td class="cell_text">Reserved Bit 0 (R0)</td>
<td id="output_can_data29_field08_len"></td>
<td id="output_can_data29_field08"></td>
<td id="output_can_data29_field08_hex"></td>
</tr>
<tr>
<td>9</td>
<td class="cell_text">Data Length Code (DLC)</td>
<td id="output_can_data29_field09_len"></td>
<td id="output_can_data29_field09"></td>
<td id="output_can_data29_field09_hex"></td>
</tr>
<tr>
<td>10</td>
<td class="cell_text">Data (Payload)</td>
<td id="output_can_data29_field10_len"></td>
<td id="output_can_data29_field10"></td>
<td id="output_can_data29_field10_hex"></td>
</tr>
<tr>
<td>11</td>
<td class="cell_text">Cyclic Redundancy Check (CRC)</td>
<td id="output_can_data29_field11_len"></td>
<td id="output_can_data29_field11"></td>
<td id="output_can_data29_field11_hex"></td>
</tr>
<tr>
<td>12</td>
<td class="cell_text">CRC Delimiter</td>
<td id="output_can_data29_field12_len"></td>
<td id="output_can_data29_field12"></td>
<td id="output_can_data29_field12_hex"></td>
</tr>
<tr>
<td>13</td>
<td class="cell_text">Acknowledgement (ACK) Slot
<span
title="Set to 1 by transmitted, pulled to 0 by receiver(s) to acknowledge."
class="help_popup">ⓘ
</span>
</td>
<td id="output_can_data29_field13_len"></td>
<td id="output_can_data29_field13"></td>
<td id="output_can_data29_field13_hex"></td>
</tr>
<tr>
<td>14</td>
<td class="cell_text">Acknowledgement Delimiter</td>
<td id="output_can_data29_field14_len"></td>
<td id="output_can_data29_field14"></td>
<td id="output_can_data29_field14_hex"></td>
</tr>
<tr>
<td>15</td>
<td class="cell_text">End of Frame (EOF)</td>
<td id="output_can_data29_field15_len"></td>
<td id="output_can_data29_field15"></td>
<td id="output_can_data29_field15_hex"></td>
</tr>
<tr>
<td>16</td>
<td class="cell_text">Inter-Frame Space (IFS)
<span
title="Minimum silence required between 2 consecutive frames."
class="help_popup">ⓘ
</span>
</td>
<td id="output_can_data29_field16_len"></td>
<td id="output_can_data29_field16"></td>
<td id="output_can_data29_field16_hex"></td>
</tr>
</table>
</div>
</div>
<footer>
<div>
Made with 💙 by
<a href="https://github.com/Nik89">Nicola Furlan</a>
and <a href="https://matjaz.it/">Matjaž Guštin</a>
</div>
<div>
Version 1.2.0
–
<a href="changelog.html">
Changelog
</a>
–
<a href="https://github.com/Nik89/CanOverhead">
Source code on GitHub
</a>
–
<a href="https://github.com/Nik89/CanOverhead/issues">
Found a bug?
</a>
</div>
<br>
<div>
This website does not use cookies, does not advertise nor track the
users. All calculations happen in your browser, no data is sent
to any server.
The results of the calculator are provided with best-effort
from the authors but with no guarantee of correctness, as stated
formally in the <a href="license.html">source code license</a>.
</div>
</footer>
<script type="text/javascript" src="CanOverhead.js" charset="utf-8"></script>
<script type="text/javascript" src="HtmlToLibAdapter.js"
charset="utf-8"></script>
<script type="text/javascript" src="TestCanOverhead.js"
charset="utf-8"></script>
</body>
</html>