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CHAPTER 6: Power Up and Configuration Menu Options
29
The general format of a video command to a VDU is as follows:
ESC X Y Z
Start of video cmd.
Middle of video cmd.
nd of video cmd.
X, Y and Z represent ASCII characters. The end of video command may not be necessary and therefore
displayed as a blank. Items B, C and E through M can be defined using the format shown above.
Item D differentiates between two techniques of video highlighting: 1) The video command occupies a
space on the screen and defines the start of a video highlight field (e.g., Televideo 925). 2) The video
command does not occupy a space and does determine the type of video highlight for all subsequent
received characters, regardless of their positions on the screen (e.g., DEC VT100).
Video types referred to in figure 7 correspond to the video highlighting codes which are sent to the A/S-
4 from the IBM host. It is up to the operator to enter the proper value for the middle
of command to match (or mismatch, if desired) each video type.
If no video highlighting is desired, the operator may turn off (prevent the A/S-4 from sending video
commands) this feature by entering a space for Item B, start of video command. The A/S-4 assumes if
there is no start command, than there is no video commands for the VDU.