201 lines
3.2 KiB
HTML
201 lines
3.2 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Jargon</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="Serial cabling"
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HREF="serial.html"><LINK
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REL="PREVIOUS"
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TITLE="Serial cabling"
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HREF="serial.html"><LINK
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REL="NEXT"
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TITLE="Cable from console port to modem"
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HREF="serial-pc-modem.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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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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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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><A
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HREF="serial.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="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 11. Serial cabling</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="serial-pc-modem.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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></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="SERIAL-JARGON"
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></A
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>11.1. Jargon</H1
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><P
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><SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> cables were originally intended to
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link terminals to modems. The terminal is formally named a Data
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Terminal Equipment, abbreviated to <SPAN
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CLASS="ACRONYM"
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>DTE</SPAN
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>. The modem
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is formally named a Data Communications Equipment, abbreviated to
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<SPAN
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CLASS="ACRONYM"
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>DCE</SPAN
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>.</P
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><P
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>A standard <SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> cable has a 25-pin
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D-type socket, which connects to the <SPAN
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CLASS="ACRONYM"
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>DTE</SPAN
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>, and a
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25-pin D-type plug, which connects to the <SPAN
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CLASS="ACRONYM"
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>DCE</SPAN
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>.
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All 25 pins are connected, with pin 1 on the plug wired to pin 1 on
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the socket, pin 2 on the plug wired to pin 2 on the socket, and so
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on. The shielding of the cable is attached to the metallic cover
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on the socket.</P
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><P
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><SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> signaling is much more robust than
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the signalling of many other communications standards. Pins can be
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shorted, not connected or drive more than one output.</P
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><P
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>Signals are named from the point of view of the Data Terminal
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Equipment. So Transmit Data on the <SPAN
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CLASS="ACRONYM"
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>DTE</SPAN
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> is
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connected to Transmit Data on the <SPAN
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CLASS="ACRONYM"
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>DCE</SPAN
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>. The
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Transmit Data pin on the <SPAN
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CLASS="ACRONYM"
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>DTE</SPAN
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> actually transmits
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data, whereas Transmit Data pin on the <SPAN
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CLASS="ACRONYM"
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>DCE</SPAN
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>
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actually recieves data.</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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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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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="serial.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="serial-pc-modem.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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>Serial cabling</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="serial.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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>Cable from console port to modem</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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> |