Re: [DUG]: TCP/IP Question

Paul Lowman Tue, 13 Jul 1999 15:14:01 -0700

ÿş<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=unicode" http-equiv=Content-Type> <META content="MSHTML 5.00.2314.1000" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT size=2>Peter </FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>A typical approach to packaging the data might be as follows:-</FONT></DIV> <DIV> </DIV> <DIV> </DIV> <DIV><FONT face=Courier size=2><STRONG>Protocol Detail</STRONG></FONT></DIV> <DIV><FONT face=Courier size=2><BR><STRONG>Enquiry</STRONG></FONT></DIV> <DIV><FONT face=Courier size=2><STRONG><BR></STRONG>The enquiry message is used for sending commands and data.</FONT></DIV> <DIV><FONT face=Courier size=2><BR>ENQ < cc > STX < data > ETX < BCC > EOT</FONT></DIV> <DIV><FONT face=Courier size=2><BR>or</FONT></DIV> <DIV><FONT face=Courier size=2><BR>ENQ < cc > EOT if no data</FONT></DIV> <DIV><FONT face=Courier size=2><BR><STRONG>Acknowledgement</STRONG></FONT></DIV> <DIV><FONT face=Courier size=2><BR>The acknowledgment message is used to respond to an Enquiry either with or without data.</FONT></DIV> <DIV><FONT face=Courier size=2><BR>ACK < cc > STX < data > ETX < BCC > EOT</FONT></DIV> <DIV><FONT face=Courier size=2><BR>or</FONT></DIV> <DIV><FONT face=Courier size=2><BR>ACK EOT</FONT></DIV> <DIV><FONT face=Courier size=2><BR><STRONG>Error</STRONG></FONT></DIV> <DIV><FONT face=Courier size=2><BR>The error message is used to indicate a bad Enquiry</FONT></DIV> <DIV><FONT face=Courier size=2><BR>NAK <ee> EOT</FONT></DIV> <DIV><FONT face=Courier size=2><BR>Where  cc - 2 digit command code as described in following section<BR>            data - ascii data (no ascii control between 0 and $1f)</FONT></DIV> <DIV><FONT face=Courier size=2>            ee - error code<BR>                    01 - bad BCC<BR>                    02 - bad command<BR>                    03 - access denied<BR>                    04 - bad data<BR>             bcc  - STX xor data0 xor data1 ... xor ETX<BR>                       represented as two hex digits.   <BR></DIV></FONT> <DIV><FONT face=Courier size=2><STRONG>Example</STRONG></FONT></DIV> <DIV><FONT face=Courier size=2><STRONG><BR></STRONG>Data sent - Send Password - KAZAM<BR>  05  30  30  02  4b  41  5a  41  4d  03  35  44  04<BR>Received -  ACK EOT<BR>  06  04</FONT></DIV> <DIV><FONT face=Courier size=2></FONT> </DIV> <DIV><FONT face=Courier size=2><FONT face=Arial>Paul Lowman</FONT></FONT></DIV> <DIV> </DIV> <DIV><FONT face=Courier size=2><FONT face=Arial>Software/Hardware developer<BR>Lowman Consulting</FONT><BR></DIV></FONT></BODY></HTML>

Re: [DUG]: TCP/IP Question

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