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File Transfer Utilities
edged before sending the next. When the transmitter has no more data to send, it
sends an EOT to complete the transfer.
The XModem/CRC Protocol.
The XModem/CRC Protocol.
The XModem/CRC Protocol.
The XModem/CRC Protocol. The XModem/CRC protocol is similar to the XModem
protocol, but the receiver specifies CRC-16 by sending C (Hex 43) instead of NAK
when requesting the first block. A two-byte CRC is sent in place of the one-byte arith-
metic checksum.
Note
The XModem and YModem screens are almost identical, except that XModem does
not have a File Name field, that is, it supports multi-file transfers with packet sizes of
128 to 1024 bytes. The remainder of Xmodem and Ymodem fields have identical
descriptions. Therefore, only the YModem screen is shown, and one table containing
field descriptions is presented. Both MIBs are given.
YModem
The Ymodem batch protocol is an extension to the Xmodem/CRC protocol. It allows
zero or more files to be transmitted in a single session and supports 1024 data size
packets. Ymodem always sends an information packet containing the filename and file
length with each file.
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