Characters entered in this manner are indistinguishable from those typed on the TTY.
Whatever you can do in the TTY, you can also do with this command.
RVP900 sends all TTY output to whichever stream (TTY, or host computer) provided the
most recent input character. This command is also used to monitor the graphical data from
the special scope plotting modes.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| | Operation | 1 0 0 1 1 | Command
|---------------|---|---|---|---|------------|--------------------|
The operation codes are as follows:
0
Sends the ASCII character in the upper byte of the word to the RVP900 as if it had
been typed on the setup TTY keyboard.
1
Allow scope plotting data to be output when a plot is being drawn. All relevant status
and data words are output once upon each receipt of this command. Subsequently,
status and data is output only when a change has taken place.
2
Disable the scope plotting output data.
Any of the following types of data may be output by RVP900 while the TTY monitor is
running. The order of arrival of each data type is indeterminate, but all multi-word
sequences are always be output as contiguous words.
Individual TTY characters generated by RVP900 are output in the low byte of the word, with
the upper byte set to zeros.
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---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| 0 0 0 0 0 0 0 0 | ASCII Character | TTY Char
|-------------------------------|--------------------------------|
The status of the plotting modes is given in the following word.
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---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| 1 0 0 0 | |PLT| Status
|---------------|----------------|-------------------------------|
PLT Indicates that a scope plot is being drawn now.
Chapter 8 – Host Computer Commands
301
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