The xmodem protocol is fairly simple to implement , did it once in basic
You can find a description of the protocol on it's only a page long

http://www.strangecreations.com/library/x2ftp/formats.htm  under xmodem.zip


Peter

Steen Jensen wrote:
 >
 > I have written a program which read all adresses in a 24C16 I2C EEPROM
and
 > sends the data to a PC via RS232 (8,N,1 1200 Baud). I have used the
Windows
 > Terminal program for receiving the data. But when I receive the data as
a
 > text file (ASCII) there is a probelm with the control characters CR, FF,
LF
 > etc. They are not read as data. Can I somehow receive the data as a
binary
 > file? I have tried to use the various protocols for this purpose, but it
 > always ends out with a failure. What do I need to do in my Pic-code to
 > support fx. the Xmodem or the Kermit protocol? I hope you are able to
help
 > me !
 >
 > With kind regards
 > GDK-SSJ - Steen Schelle Jensen
 > Dept.: 1545
 > Internet e-mail: ssjensen@grundfos.com