<HTML ><HEAD ><TITLE >Jargon</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Remote Serial Console HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Serial cabling" HREF="serial.html"><LINK REL="PREVIOUS" TITLE="Serial cabling" HREF="serial.html"><LINK REL="NEXT" TITLE="Cable from console port to modem" HREF="serial-pc-modem.html"></HEAD ><BODY CLASS="SECTION" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Remote Serial Console HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="serial.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 11. Serial cabling</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="serial-pc-modem.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECTION" ><H1 CLASS="SECTION" ><A NAME="SERIAL-JARGON" ></A >11.1. Jargon</H1 ><P ><SPAN CLASS="ACRONYM" >RS-232</SPAN > cables were originally intended to link terminals to modems. The terminal is formally named a Data Terminal Equipment, abbreviated to <SPAN CLASS="ACRONYM" >DTE</SPAN >. The modem is formally named a Data Communications Equipment, abbreviated to <SPAN CLASS="ACRONYM" >DCE</SPAN >.</P ><P >A standard <SPAN CLASS="ACRONYM" >RS-232</SPAN > cable has a 25-pin D-type socket, which connects to the <SPAN CLASS="ACRONYM" >DTE</SPAN >, and a 25-pin D-type plug, which connects to the <SPAN CLASS="ACRONYM" >DCE</SPAN >. All 25 pins are connected, with pin 1 on the plug wired to pin 1 on the socket, pin 2 on the plug wired to pin 2 on the socket, and so on. The shielding of the cable is attached to the metallic cover on the socket.</P ><P ><SPAN CLASS="ACRONYM" >RS-232</SPAN > signaling is much more robust than the signalling of many other communications standards. Pins can be shorted, not connected or drive more than one output.</P ><P >Signals are named from the point of view of the Data Terminal Equipment. So Transmit Data on the <SPAN CLASS="ACRONYM" >DTE</SPAN > is connected to Transmit Data on the <SPAN CLASS="ACRONYM" >DCE</SPAN >. The Transmit Data pin on the <SPAN CLASS="ACRONYM" >DTE</SPAN > actually transmits data, whereas Transmit Data pin on the <SPAN CLASS="ACRONYM" >DCE</SPAN > actually recieves data.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="serial.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="serial-pc-modem.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Serial cabling</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="serial.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Cable from console port to modem</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
