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option does not apply if the source file is shorter.
Files that have been converted (e.g., ZCNL) or subject
to a single ended Transport Option cannot have their
transfers recovered.
11.5.2 ZZZZFFFF1111:::: MMMMaaaannnnaaaaggggeeeemmmmeeeennnntttt OOOOppppttttiiiioooonnnn
If the receiver does not recognize the Management Option, the
file should be transferred normally.
The ZZZZMMMMSSSSKKKKNNNNOOOOLLLLOOOOCCCC bit instructs the receiver to bypass the
current file if the receiver does not have a file with the
same name.
Five bits (defined by ZZZZMMMMMMMMAAAASSSSKKKK) define the following set of
mutually exclusive management options.
ZZZZMMMMNNNNEEEEWWWWLLLL Transfer file if destination file absent. Otherwise,
transfer file overwriting destination if the source file
is newer or longer.
ZZZZMMMMCCCCRRRRCCCC Compare the source and destination files. Transfer if
file lengths or file polynomials differ.
ZZZZMMMMAAAAPPPPNNNNDDDD Append source file contents to the end of the existing
destination file (if any).
ZZZZMMMMCCCCLLLLOOOOBBBB Replace existing destination file (if any).
ZZZZMMMMDDDDIIIIFFFFFFFF Transfer file if destination file absent. Otherwise,
transfer file overwriting destination if files have
different lengths or dates.
ZZZZMMMMPPPPRRRROOOOTTTT Protect destination file by transferring file only if
the destination file is absent.
ZZZZMMMMNNNNEEEEWWWW Transfer file if destination file absent. Otherwise,
transfer file overwriting destination if the source file
is newer.
11.5.3 ZZZZFFFF2222:::: TTTTrrrraaaannnnssssppppoooorrrrtttt OOOOppppttttiiiioooonnnn
If the receiver does not implement the particular transport
option, the file is copied without conversion for later
processing.
ZZZZTTTTLLLLZZZZWWWW Lempel-Ziv compression. Transmitted data will be
identical to that produced by ccccoooommmmpppprrrreeeessssssss 4444....0000 operating on
a computer with VAX byte ordering, using 12 bit
encoding.
ZZZZTTTTCCCCRRRRYYYYPPPPTTTT Encryption. An initial null terminated string
identifies the key. Details to be determined.
Chapter 11 Rev 10-27-87 Typeset 10-27-87 27
Chapter 11 ZMODEM Protocol 28
ZZZZTTTTRRRRLLLLEEEE Run Length encoding, Details to be determined.
A ZZZZCCCCRRRRCCCCWWWW data subpacket follows with file name, file length,
modification date, and other information described in a later
chapter.
11.5.4 ZZZZFFFF3333:::: EEEExxxxtttteeeennnnddddeeeedddd OOOOppppttttiiiioooonnnnssss
The Extended Options are bit encoded.
ZZZZTTTTSSSSPPPPAAAARRRRSSSS Special processing for sparse files, or sender managed
selective retransmission. Each file segment is transmitted as
a separate frame, where the frames are not necessarily
contiguous. The sender should end each segment with a ZCRCW
data subpacket and process the expected ZACK to insure no data
is lost. ZTSPARS cannot be used with ZCNL.
11.6 ZZZZSSSSKKKKIIIIPPPP
Sent by the receiver in response to ZZZZFFFFIIIILLLLEEEE, makes the sender skip to
the next file.
11.7 ZZZZNNNNAAAAKKKK
Indicates last header was garbled. (See also ZZZZRRRRPPPPOOOOSSSS).
11.8 ZZZZAAAABBBBOOOORRRRTTTT
Sent by receiver to terminate batch file transfers when requested by
the user. Sender responds with a ZZZZFFFFIIIINNNN sequence.[2]
11.9 ZZZZFFFFIIIINNNN