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-<refentry id="FE_SET_VOLTAGE">
- <refmeta>
- <refentrytitle>ioctl FE_SET_VOLTAGE</refentrytitle>
- &manvol;
- </refmeta>
-
- <refnamediv>
- <refname>FE_SET_VOLTAGE</refname>
- <refpurpose>Allow setting the DC level sent to the antenna subsystem.</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>ioctl</function></funcdef>
- <paramdef>int <parameter>fd</parameter></paramdef>
- <paramdef>int <parameter>request</parameter></paramdef>
- <paramdef>enum fe_sec_voltage *<parameter>voltage</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Arguments</title>
- <variablelist>
- <varlistentry>
- <term><parameter>fd</parameter></term>
- <listitem>
- <para>&fe_fd;</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>request</parameter></term>
- <listitem>
- <para>FE_SET_VOLTAGE</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>voltage</parameter></term>
- <listitem>
- <para>pointer to &fe-sec-voltage;</para>
- <para>Valid values are described at &fe-sec-voltage;.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Description</title>
-
-<para>This ioctl allows to set the DC voltage level sent through the antenna
- cable to 13V, 18V or off.</para>
-<para>Usually, a satellite antenna subsystems require that the digital TV
- device to send a DC voltage to feed power to the LNBf. Depending on the
- LNBf type, the polarization or the intermediate frequency (IF) of the LNBf
- can controlled by the voltage level. Other devices (for example, the ones
- that implement DISEqC and multipoint LNBf's don't need to control the
- voltage level, provided that either 13V or 18V is sent to power up the
- LNBf.</para>
-<para>NOTE: if more than one device is connected to the same antenna,
- setting a voltage level may interfere on other devices, as they may lose
- the capability of setting polarization or IF. So, on those
- cases, setting the voltage to SEC_VOLTAGE_OFF while the device is not is
- used is recommended.</para>
-
-&return-value-dvb;
-</refsect1>
-
-</refentry>