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Status
7. Command Completion Status. This request returns one character (S, F, or U) to indicate
the completion status of the last command sent to the terminal. It can indicate satisfac-
tory completion (S), failure
(F),
or interruption of the operation by the terminal operator
pressing the
1:1
key
(U).
The escape sequence used for each of the above requests and the format of the returned status
information is presented in the following paragraphs.
STATUS TRANSFER HANDSHAKING
All status requests are treated as block transfers. In response to a status request, the termi-
nal transmits an escape sequence, followed by a series of data bytes, followed by a terminator.
The terminator is as follows:
Character Mode:
Block Line Mode:
Block Page Mode:
<CR>
or
<CR>< LF>
<CR>
or
<CR>< LF>
<Block Termi nator >
In either Character mode or Block Line mode, the
<CR><LF>
is used if Auto Linefeed mode
is enabled. In Block Page mode, the block terminator is as selected on the Terminal Configu-
ration menu. The default block terminator is
<RS>.
The type of handshaking used is determined by the setting of the InhHndShk and InhDC2
fields of the Terminal Configuration menu as follows:
InhHndShkCG)
=NO
DCI
Inh DC2CH)
=YES or NO
InhHndShkCG)
=YES
No handshake
I nh DC2CH)
=YES
InhHndShkCG)
=YES
DC I/DC2/DC I
Inh DC2CH)
=NO
Note that a status request escape sequence resets the «block trigger received" flag. This
means, for example, that if you are using the DCI handshake and the terminal receives a
<DC1>
followed by the request, it «forgets" that a block trigger was just received and thus
will not send the data immediately. The terminal must receive another
<DC1 >
before it will
start the data transfer.
8-2
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