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+<table class="head">
+ <tr>
+ <td class="head-ltitle">UCHCOM(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">UCHCOM(4)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">uchcom</code> &#x2014;
+ <span class="Nd">WinChipHead CH9102/CH343/CH341/CH340 USB to serial UART
+ driver</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp"><code class="Cd">device usb</code>
+ <br/>
+ <code class="Cd">device ucom</code>
+ <br/>
+ <code class="Cd">device uchcom</code></p>
+<p class="Pp">In <a class="Xr">rc.conf(5)</a>:
+ <br/>
+ <code class="Cd">kld_list=&quot;uchcom&quot;</code></p>
+<p class="Pp">In <a class="Xr">sysctl.conf(5)</a>:
+ <br/>
+ <code class="Cd">hw.usb.uchcom.debug=1</code></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">uchcom</code> driver provides support for the
+ WinChipHead USB to serial UART adapters. If the appropriate hardware is
+ detected, the driver will be loaded automatically by
+ <a class="Xr">devmatch(8)</a>. To load the driver manually, add it to the
+ <code class="Ic">kld_list</code> in <a class="Xr">rc.conf(5)</a>, or use
+ <a class="Xr">kldload(8)</a> at runtime. The device is accessed through the
+ <a class="Xr">ucom(4)</a> driver, which makes it behave like a
+ <a class="Xr">tty(4)</a>.</p>
+<p class="Pp">Call out through this interface with applications like
+ <a class="Xr">cu(1)</a> or <a class="Xr">tip(1)</a>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
+<p class="Pp">The <code class="Nm">uchcom</code> driver supports the following
+ USB to serial UART controllers:</p>
+<p class="Pp"></p>
+<ul class="Bl-bullet Bl-compact">
+ <li>WinChipHead CH9102 (max 6Mbps)</li>
+ <li>WinChipHead CH343 (max 6Mbps)</li>
+ <li>WinChipHead CH341 (max 2Mbps)</li>
+ <li>WinChipHead CH340 (max 2Mbps)</li>
+</ul>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
+ VARIABLES</a></h1>
+<p class="Pp">These settings can be entered in the <a class="Xr">loader(8)</a>
+ prompt, set in <a class="Xr">loader.conf(5)</a>,
+ <a class="Xr">sysctl.conf(5)</a>, or changed at runtime with
+ <a class="Xr">sysctl(8)</a>:</p>
+<dl class="Bl-tag">
+ <dt id="hw.usb.uchcom.debug"><var class="Va">hw.usb.uchcom.debug</var></dt>
+ <dd>Enable debugging messages, default
+ &#x2018;<code class="Li">0</code>&#x2019;</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
+<dl class="Bl-tag Bl-compact">
+ <dt><span class="Pa">/dev/ttyU*</span></dt>
+ <dd>for callin ports</dd>
+ <dt><span class="Pa">/dev/ttyU*.init</span></dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+ <dt><span class="Pa">/dev/ttyU*.lock</span></dt>
+ <dd>corresponding callin initial-state and lock-state devices
+ <p class="Pp"></p>
+ </dd>
+ <dt><span class="Pa">/dev/cuaU*</span></dt>
+ <dd>for callout ports</dd>
+ <dt><span class="Pa">/dev/cuaU*.init</span></dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+ <dt><span class="Pa">/dev/cuaU*.lock</span></dt>
+ <dd>corresponding callout initial-state and lock-state devices</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<p class="Pp"><a class="Xr">cu(1)</a>, <a class="Xr">tty(4)</a>,
+ <a class="Xr">ucom(4)</a>, <a class="Xr">usb(4)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="Nm">uchcom</code> driver appeared in
+ <span class="Ux">FreeBSD 8.0</span> from <span class="Ux">NetBSD
+ 5.0</span>.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">June 25, 2025</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>