Archives
/
pikvm
mirror of https://github.com/pikvm/pikvm
2
0
Fork 0
Code Issues Projects Releases Wiki Activity
You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
gh-pages
master
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'b0aa49af2e'
${ noResults }
pikvm/usb_serial/index.html

1795 lines
36 KiB
HTML
Raw Blame History

<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="description" content="Open and cheap DIY IP-KVM on Raspberry Pi">
<meta name="author" content="Maxim Devaev">
<link rel="canonical" href="https://pikvm.github.io/pikvm/usb_serial/">
<link rel="prev" href="../usb_ethernet/">
<link rel="next" href="../usb_dynamic/">
<link rel="icon" href="../_assets/favicon.ico">
<meta name="generator" content="mkdocs-1.6.0, mkdocs-material-9.5.27">
<title>Serial-over-USB - PiKVM Handbook</title>
<link rel="stylesheet" href="../assets/stylesheets/main.6543a935.min.css">
<link rel="stylesheet" href="../assets/stylesheets/palette.06af60db.min.css">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=arial,+sans-serif:300,300i,400,400i,700,700i%7Cmonospace:400,400i,700,700i&display=fallback">
<style>:root{--md-text-font:"arial, sans-serif";--md-code-font:"monospace"}</style>
<link rel="stylesheet" href="../_assets/user.css">
<script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
</head>
<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="pink">
<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
<label class="md-overlay" for="__drawer"></label>
<div data-md-component="skip">
<a href="#serial-over-usb-connection" class="md-skip">
Skip to content
</a>
</div>
<div data-md-component="announce">
</div>
<header class="md-header md-header--shadow" data-md-component="header">
<nav class="md-header__inner md-grid" aria-label="Header">
<a href=".." title="PiKVM Handbook" class="md-header__button md-logo" aria-label="PiKVM Handbook" data-md-component="logo">
<img src="../_assets/logo.png" alt="logo">
</a>
<label class="md-header__button md-icon" for="__drawer">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></svg>
</label>
<div class="md-header__title" data-md-component="header-title">
<div class="md-header__ellipsis">
<div class="md-header__topic">
<span class="md-ellipsis">
PiKVM Handbook
</span>
</div>
<div class="md-header__topic" data-md-component="header-topic">
<span class="md-ellipsis">
Serial-over-USB
</span>
</div>
</div>
</div>
<label class="md-header__button md-icon" for="__search">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
</label>
<div class="md-search" data-md-component="search" role="dialog">
<label class="md-search__overlay" for="__search"></label>
<div class="md-search__inner" role="search">
<form class="md-search__form" name="search">
<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
<label class="md-search__icon md-icon" for="__search">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg>
</label>
<nav class="md-search__options" aria-label="Search">
<a href="javascript:void(0)" class="md-search__icon md-icon" title="Share" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M18 16.08c-.76 0-1.44.3-1.96.77L8.91 12.7c.05-.23.09-.46.09-.7 0-.24-.04-.47-.09-.7l7.05-4.11c.54.5 1.25.81 2.04.81a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3c0 .24.04.47.09.7L8.04 9.81C7.5 9.31 6.79 9 6 9a3 3 0 0 0-3 3 3 3 0 0 0 3 3c.79 0 1.5-.31 2.04-.81l7.12 4.15c-.05.21-.08.43-.08.66 0 1.61 1.31 2.91 2.92 2.91 1.61 0 2.92-1.3 2.92-2.91A2.92 2.92 0 0 0 18 16.08Z"/></svg>
</a>
<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41Z"/></svg>
</button>
</nav>
<div class="md-search__suggest" data-md-component="search-suggest"></div>
</form>
<div class="md-search__output">
<div class="md-search__scrollwrap" tabindex="0" data-md-scrollfix>
<div class="md-search-result" data-md-component="search-result">
<div class="md-search-result__meta">
Initializing search
</div>
<ol class="md-search-result__list" role="presentation"></ol>
</div>
</div>
</div>
</div>
</div>
<div class="md-header__source">
<a href="https://github.com/pikvm/pikvm" title="Go to repository" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.5.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
</div>
<div class="md-source__repository">
pikvm/pikvm
</div>
</a>
</div>
</nav>
</header>
<div class="md-container" data-md-component="container">
<main class="md-main" data-md-component="main">
<div class="md-main__inner md-grid">
<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
<label class="md-nav__title" for="__drawer">
<a href=".." title="PiKVM Handbook" class="md-nav__button md-logo" aria-label="PiKVM Handbook" data-md-component="logo">
<img src="../_assets/logo.png" alt="logo">
</a>
PiKVM Handbook
</label>
<div class="md-nav__source">
<a href="https://github.com/pikvm/pikvm" title="Go to repository" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.5.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
</div>
<div class="md-source__repository">
pikvm/pikvm
</div>
</a>
</div>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_1" >
<label class="md-nav__link" for="__nav_1" id="__nav_1_label" tabindex="">
<span class="md-ellipsis">
Getting started
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_1_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_1">
<span class="md-nav__icon md-icon"></span>
Getting started
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_1_1" >
<label class="md-nav__link" for="__nav_1_1" id="__nav_1_1_label" tabindex="0">
<span class="md-ellipsis">
Device guides
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_1_1_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_1_1">
<span class="md-nav__icon md-icon"></span>
Device guides
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../v4/" class="md-nav__link">
<span class="md-ellipsis">
PiKVM V4 Mini & Plus
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../v3/" class="md-nav__link">
<span class="md-ellipsis">
PiKVM V3 HAT
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../v2/" class="md-nav__link">
<span class="md-ellipsis">
DIY PiKVM V2
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../v1/" class="md-nav__link">
<span class="md-ellipsis">
DIY PiKVM V1
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../first_steps/" class="md-nav__link">
<span class="md-ellipsis">
First steps
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../auth/" class="md-nav__link">
<span class="md-ellipsis">
Authentication
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../faq/" class="md-nav__link">
<span class="md-ellipsis">
FAQ & Troubleshooting
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_2" >
<label class="md-nav__link" for="__nav_2" id="__nav_2_label" tabindex="">
<span class="md-ellipsis">
Networking
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_2_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_2">
<span class="md-nav__icon md-icon"></span>
Networking
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_2_1" >
<label class="md-nav__link" for="__nav_2_1" id="__nav_2_1_label" tabindex="0">
<span class="md-ellipsis">
Internet access
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_2_1_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_2_1">
<span class="md-nav__icon md-icon"></span>
Internet access
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../port_forwarding/" class="md-nav__link">
<span class="md-ellipsis">
Port forwarding
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../tailscale/" class="md-nav__link">
<span class="md-ellipsis">
Tailscale VPN
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../cloudflared/" class="md-nav__link">
<span class="md-ellipsis">
Cloudflare Tunnel
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../wifi/" class="md-nav__link">
<span class="md-ellipsis">
Setting up Wi-Fi
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../letsencrypt/" class="md-nav__link">
<span class="md-ellipsis">
Let's Encrypt certificates
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_3" >
<label class="md-nav__link" for="__nav_3" id="__nav_3_label" tabindex="">
<span class="md-ellipsis">
Video
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_3">
<span class="md-nav__icon md-icon"></span>
Video
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../edid/" class="md-nav__link">
<span class="md-ellipsis">
Tuning HDMI EDID
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../pass/" class="md-nav__link">
<span class="md-ellipsis">
HDMI passthrough
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../webrtc/" class="md-nav__link">
<span class="md-ellipsis">
H.264 / WebRTC
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../video/" class="md-nav__link">
<span class="md-ellipsis">
Working with video
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../audio/" class="md-nav__link">
<span class="md-ellipsis">
HDMI audio
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4" checked>
<label class="md-nav__link" for="__nav_4" id="__nav_4_label" tabindex="">
<span class="md-ellipsis">
Peripheral devices
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="true">
<label class="md-nav__title" for="__nav_4">
<span class="md-nav__icon md-icon"></span>
Peripheral devices
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_4_1" >
<label class="md-nav__link" for="__nav_4_1" id="__nav_4_1_label" tabindex="0">
<span class="md-ellipsis">
Keyboard & mouse
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_4_1_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_4_1">
<span class="md-nav__icon md-icon"></span>
Keyboard & mouse
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../mouse/" class="md-nav__link">
<span class="md-ellipsis">
Mouse modes
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../mouse_jiggler/" class="md-nav__link">
<span class="md-ellipsis">
Mouse jiggler
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../pico_hid/" class="md-nav__link">
<span class="md-ellipsis">
Pico HID (USB, PS/2)
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../bluetooth_hid/" class="md-nav__link">
<span class="md-ellipsis">
Bluetooth HID
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../msd/" class="md-nav__link">
<span class="md-ellipsis">
Mass Storage Drive
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../usb_ethernet/" class="md-nav__link">
<span class="md-ellipsis">
Ethernet-over-USB
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--active">
<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
<a href="./" class="md-nav__link md-nav__link--active">
<span class="md-ellipsis">
Serial-over-USB
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../usb_dynamic/" class="md-nav__link">
<span class="md-ellipsis">
Dynamic USB configuration
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../gpio/" class="md-nav__link">
<span class="md-ellipsis">
GPIO (pins, relays, lamps, etc)
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_5" >
<label class="md-nav__link" for="__nav_5" id="__nav_5_label" tabindex="">
<span class="md-ellipsis">
Advanced usage
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_5">
<span class="md-nav__icon md-icon"></span>
Advanced usage
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../on_boot_config/" class="md-nav__link">
<span class="md-ellipsis">
On-boot configuration
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../vnc/" class="md-nav__link">
<span class="md-ellipsis">
Using VNC
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../multiport/" class="md-nav__link">
<span class="md-ellipsis">
Multiport KVM-over-IP
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../wol/" class="md-nav__link">
<span class="md-ellipsis">
Wake-on-LAN the server
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../ipmi/" class="md-nav__link">
<span class="md-ellipsis">
IPMI & Redfish integration
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../pst/" class="md-nav__link">
<span class="md-ellipsis">
Persistent storage
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../prometheus/" class="md-nav__link">
<span class="md-ellipsis">
Prometheus monitoring
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_6" >
<label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="">
<span class="md-ellipsis">
Development
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_6">
<span class="md-nav__icon md-icon"></span>
Development
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../api/" class="md-nav__link">
<span class="md-ellipsis">
HTTP API reference
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../building_os/" class="md-nav__link">
<span class="md-ellipsis">
Building PiKVM OS
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../3d_printing/" class="md-nav__link">
<span class="md-ellipsis">
Cases for 3D printing
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_7" >
<label class="md-nav__link" for="__nav_7" id="__nav_7_label" tabindex="">
<span class="md-ellipsis">
Legacy
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_7_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_7">
<span class="md-nav__icon md-icon"></span>
Legacy
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../arduino_hid/" class="md-nav__link">
<span class="md-ellipsis">
Arduino HID
</span>
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</div>
</div>
</div>
<div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
</nav>
</div>
</div>
</div>
<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<div><h1 id="serial-over-usb-connection">Serial-over-USB connection<a class="headerlink" href="#serial-over-usb-connection" title="Permanent link"></a></h1>
<p>Specifically to V2+. This can be used for terminal access from the managed server to the PiKVM, or for any other purpose that requires a serial connection. In the last case, you only need to perform step 1 and reboot.</p>
<details class="warning">
<summary>USB limitations</summary>
<p><strong>TL;DR: By default, you can add only one additional device to choose from, such as USB Ethernet, or USB Serial, or an extra Mass Storage Drive.</strong></p>
<p>There is a hardware limit on the number of devices that can be emulated at the same time.
Each USB device uses so-called endpoints to communicate with the host.
Depending on the type, the device consumes a different number of endpoints,
while their total number is limited by the capabilities of the chip, <strong>for Raspberry Pi it is 8</strong>.</p>
<p>It is quite difficult to calculate the number of endpoints used, but in the case of PiKVM,
you can focus on the following numbers:</p>
<table>
<thead>
<tr>
<th>Device</th>
<th>Endpoints</th>
</tr>
</thead>
<tbody>
<tr>
<td>Keyboard, mouse</td>
<td>1 for each</td>
</tr>
<tr>
<td>Mass Storage Drive</td>
<td>2 for each</td>
</tr>
<tr>
<td>USB Ethernet, USB Serial</td>
<td>3 for each</td>
</tr>
</tbody>
</table>
<p>V2 and V3 emulates one mouse by default, V4 emulates two mouses. Thus, V2 and V3 use 4 endpoints, and V4 uses 5 by default.</p>
<p>Creating an axtra Mass Storage Drive consumes additional endpoints, as well as USB Serial and USB Ethernet,
so only a limited number of devices can be selected for the final configuration, for example, one USB Ethernet.</p>
<p>If you need something more non-standard, you can <a href="../msd/#disable-msd">disable the regular Mass Storage Drive</a>
and the additional mouse (on V4) to free up some extra endpoints.</p>
<p>The <code>kvmd-otg</code> service is responsible for setting up USB emulation. If the endpoint limit is exceeded,
the service will not be able to start and no emulated USB device will work.</p>
<p>In the log it looks something like this:</p>
<div class="highlight"><pre><span></span><code># journalctl -u kvmd-otg
...
kvmd-otg[382]: kvmd.apps.otg INFO --- ===== Preparing complete =====
kvmd-otg[382]: kvmd.apps.otg INFO --- Enabling the gadget ...
kvmd-otg[382]: kvmd.apps.otg INFO --- WRITE --- /sys/kernel/config/usb_gadget/kvmd/UDC
kvmd-otg[382]: OSError: [Errno 524] Unknown error 524
kvmd-otg[382]: During handling of the above exception, another exception occurred:
kvmd-otg[382]: Traceback (most recent call last):
kvmd-otg[382]: File "/usr/bin/kvmd-otg", line 9, in &lt;module&gt;
kvmd-otg[382]: main()
kvmd-otg[382]: File "/usr/lib/python3.10/site-packages/kvmd/apps/otg/__init__.py", line 348, in main
kvmd-otg[382]: options.cmd(config)
kvmd-otg[382]: File "/usr/lib/python3.10/site-packages/kvmd/apps/otg/__init__.py", line 278, in _cmd_start
kvmd-otg[382]: _write(join(gadget_path, "UDC"), udc)
kvmd-otg[382]: File "/usr/lib/python3.10/site-packages/kvmd/apps/otg/__init__.py", line 83, in _write
kvmd-otg[382]: with open(path, "w") as file:
kvmd-otg[382]: OSError: [Errno 524] Unknown error 524
systemd[1]: kvmd-otg.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: kvmd-otg.service: Failed with result 'exit-code'.
systemd[1]: Failed to start PiKVM - OTG setup.
</code></pre></div>
<p>In this case, you need to disable some of the previously enabled devices and restart PiKVM.</p>
</details>
<ol>
<li>
<p>Edit <code>/etc/kvmd/override.yaml</code> and add these lines:</p>
<div class="highlight"><pre><span></span><code><span class="nt">otg</span><span class="p">:</span>
<span class="w"> </span><span class="nt">devices</span><span class="p">:</span>
<span class="w"> </span><span class="nt">serial</span><span class="p">:</span>
<span class="w"> </span><span class="nt">enabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span>
</code></pre></div>
</li>
<li>
<p>Run the following command:</p>
<div class="highlight"><pre><span></span><code># echo ttyGS0 &gt;&gt; /etc/securetty
</code></pre></div>
</li>
<li>
<p>Create the directory <code>/etc/systemd/system/getty@ttyGS0.service.d</code> and add a file file named <code>override.conf</code> into it. Afterwards edit the file and copy this into it:</p>
<div class="highlight"><pre><span></span><code><span class="k">[Service]</span>
<span class="na">TTYReset</span><span class="o">=</span><span class="s">no</span>
<span class="na">TTYVHangup</span><span class="o">=</span><span class="s">no</span>
<span class="na">TTYVTDisallocate</span><span class="o">=</span><span class="s">no</span>
</code></pre></div>
</li>
<li>
<p>Run these comands:</p>
<div class="highlight"><pre><span></span><code># systemctl enable getty@ttyGS0.service
# reboot
</code></pre></div>
</li>
<li>
<p>Once PiKVM is rebooted you will have access to a virtual serial port on the server that the USB is connected to. Use mingetty, screen, putty, or something like this to access the kvm from the server. The port is called <code>/dev/ttyAMA0</code>.</p>
</li>
</ol></div>
</article>
</div>
<script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script>
</div>
<button type="button" class="md-top md-icon" data-md-component="top" hidden>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg>
Back to top
</button>
</main>
<footer class="md-footer">
<div class="md-footer-meta md-typeset">
<div class="md-footer-meta__inner md-grid">
<div class="md-copyright">
<div class="md-copyright__highlight">
Copyright &copy; 2018-2022 Maxim Devaev
</div>
Made with
<a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener">
Material for MkDocs
</a>
</div>
</div>
</div>
</footer>
</div>
<div class="md-dialog" data-md-component="dialog">
<div class="md-dialog__inner md-typeset"></div>
</div>
<script id="__config" type="application/json">{"base": "..", "features": ["navigation.indexes", "navigation.sections", "navigation.top", "navigation.tracking", "navigation.expand", "search.highlight", "search.share", "search.suggest"], "search": "../assets/javascripts/workers/search.b8dbb3d2.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}}</script>
<script src="../assets/javascripts/bundle.ad660dcc.min.js"></script>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink