XMODEM

X-Modem:

Offset            Contents
0                    SOH = Ascii 01
1                    Block #, start with 1, wrap to 0 after FF
2                    Ones complement (XOR with 0xFF) of block #
3-130            128 bytes of data
131                 CRC Checksum of bytes  (carry ignored)

+ Also:

Delphi (Pascal) code for XMODEM version 16 BIT CRC +

Remember also that the 'window size' is 1. An ASCII ACK must be sent to the sender before the next packet will be sent. If the checksum doesnt match, a NAK must be sent. After 10 NAKs, the transfer should abort. +

Archive:

PICList post "X-modem protocol" +

See also:

http://www.geocities.com/westfw/ymodem.txt X / Y MODEM protocol references.+

file: /Techref/xmodem.htm, 1KB, , updated: 2002/11/29 12:47, local time: 2024/10/4 02:08, owner: JMN-EFP-786,

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