197 lines
3.1 KiB
HTML
197 lines
3.1 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Configure modem to ignore DTR and assert
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DCD</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Remote Serial Console HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Upgrading Red Hat Linux from a
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serial console"
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HREF="rhl.html"><LINK
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REL="PREVIOUS"
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TITLE="Configure the BIOS to use the serial
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port"
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HREF="rhl-biosserial.html"><LINK
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REL="NEXT"
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TITLE="Prepare a network install floppy diskette"
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HREF="rhl-preparefloppy.html"></HEAD
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><BODY
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CLASS="SECTION"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Remote Serial Console HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Appendix C. Upgrading <SPAN
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CLASS="PRODUCTNAME"
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>Red Hat Linux</SPAN
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> from a
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serial console</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="rhl-preparefloppy.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="RHL-IGNOREDTR"
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></A
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>C.3. Configure modem to ignore <SPAN
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CLASS="ACRONYM"
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>DTR</SPAN
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> and assert
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<SPAN
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CLASS="ACRONYM"
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>DCD</SPAN
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></H1
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><P
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>The computer reboots a few times during the upgrade. These
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reboots hang up the modem. Having to dial in a number of times
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during the upgrade can become annoying. Altering the modem's
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configuration to ignore Data Terminal Ready will cause the modem
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not to hang up when the computer is rebooted. To ignore
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<SPAN
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CLASS="ACRONYM"
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>DTR</SPAN
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> send the command
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<B
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CLASS="COMMAND"
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>AT&D0</B
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> to the modem.</P
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><P
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>We may also wish to disconnect during the install to reduce
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transmission charges. Configuring the modem to hold Data Carrier
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Detect on will prevent any disconnection and reconnection from
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being apparent to the installer. Use the command
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<B
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CLASS="COMMAND"
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>AT&C0</B
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> to always hold <SPAN
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CLASS="ACRONYM"
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>DCD</SPAN
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>
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high.</P
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><P
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>Apply these changes using the procedure in <A
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HREF="modem-hayes.html"
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>Section 12.3</A
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>, retaining all of the other
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<TT
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CLASS="LITERAL"
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>AT</TT
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> commands.</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="rhl-biosserial.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="rhl-preparefloppy.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Configure the <SPAN
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CLASS="ACRONYM"
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>BIOS</SPAN
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> to use the serial
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port</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="rhl.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
|
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VALIGN="top"
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>Prepare a network install floppy diskette</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |