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Screen Copy to the Auxiliary Port
Some ASCII displays allow the display operator to initiate a print of the display's
screen to the printer attached on the auxiliary port. This operation is transparent to
the 3708 and has nothing to do with display-with-printer operations or with the 3708
local copy function. The 3708 performs nothing special for this operation other than
to recognize the keyboard sequence that initiates the operation and to echo it back
to the display.
An example of this operation is the Print Line Key on the 3101. This key causes
"ESC U" to be sent to the 3708. This sequence is mapped to the 3708 function
ECHO, which causes the 3708 to echo the same sequence back to the 3101. When
received there, the 3101 performs a line print operation.
These local screen capture sequences are already defined for supported terminals that
provide such functions. For UDTs, they must be defined as the input function
ECHO.
Note: If the printer is defined so that it is available for host data or local copy
printouts, care must be taken in the use of the local screen capture functions.
Careful coordination with other users and host applications must take place to
prevent the ECHO functions from interfering with host data. The 3708 cannot
prevent this from occurring.
A port should not be configured as a display with printer when the printer is only to
be used for display-terminal local screen captures to a printer attached on the
display's auxiliary port.
Chapter 4. Protocol Conversion Mode
4-93
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