Re: STX...ETX

[Ian Lowe]

Frank,

When an xPL message originates on a serial bus like RS232 or RS485, the
message has an STX on the front, and ETX on the end.

Messages which start on Ethernet (PC Apps) don't have the STX/ETC wrapper.

When a messages passes through the devcom bridge from Serial onto
Ethernet/PC, the STX/ETC pair is stripped off, and the message sent
"raw"
out onto the network.

Similarly, when a message passes from Ethernet/PC onto a Serial bus, the
STX/ETX characters are added before the message is sent onto the serial
bus.

This is the same process used when going over the Public Internet: as the
message passes through the bridge, it has a blowfish encryption wrapper
added around the message contents, then stripped off at the other end..

Ian.

----- Original Message -----
From: Frank Mc Alinden
To: <a
href="/group/ukha_xpl/post?postID=SSsPROi3pHEq62zXJIhFreZti_DntQpJDKjFBBQJAwkJYrqv2Rzg2lb-5P1vlUKR7YnU_iJifweKFEgEWOoB">ukha_xpl@xxxxxxx</a>
Sent: Sunday, May 11, 2003 12:15 PM
Subject: [ukha_xpl] STX...ETX


Hi All
Does the xPL command start with a STX and end with a ETX like the
xAP command.....Im trying to write a macro in Homevision to send a
xpl-cmd.....

Frank