Chapter 5 _______________________________________________________ Plot-Assisted Setups
VAISALA______________________________________________________________________ 143
5.2 General Conventions Within the Plot
Commands
The Pb, Ps, and Pr commands all have a similar structure to their TTY user
interface. Each command begins by printing a list of subcommands that are
valid in that context. These subcommands are single keystrokes that are
executed immediately by the RVP900 as they are typed. The ENTER key
is not required. The available subcommands are different for each plot
command; but, as much as possible, each key has a similar meaning across
all commands.
The working and measured parameters for each plot command are printed
on the TTY as two lines of information following the subcommand list.
The first line contains settings that only change when a subcommand is
issued, but the second line is live and reflects the current status of the burst
input, the IF input, or the AFC output. The first line is printed just once, but
the second line is continually overprinted on top of itself. This makes it
appear as a live status line whose values always remain up-to-date. The Pb,
Ps, and Pr commands report "No Trigger" on the TTY status line
whenever the external trigger is expected, but missing.
The TTY screen scrolls upward each time a new subcommand is executed,
so that a history of information lines and command activity are seen on the
screen. You may also use the Carriage-Return key to scroll the display
up at any time. If the initial list of subcommands disappears off the top, you
may type ? to force a reprint. To exit the plot command entirely and return
to the TTY main menu, type Q or ESC. These basic "help" and "exit"
keystrokes apply everywhere within the RVP900 setup menus. To save
space and minimize clutter on the TTY screen, they are not shown in the
itemized list of subcommands.
Most commands have a lowercase and an uppercase version. If a lowercase
command does something, then its uppercase version does the same thing,
but even more so (or in reverse). For example, if the w subcommand
widens something by a little bit, then W widens it a lot. This simple
convention reduces the number of different subcommand keys that are
needed, and makes the interface easier to memorize.
The graphical display and TTY status lines are continually updated with
fresh data several times per second. Occasionally it is useful to freeze a plot
so that it can be studied in more detail, or compared with earlier versions.
To accomplish this, every plotting command supports a "Single Step"
mode that is accessed by typing the "." (period) key. This key causes the
display and TTY status lines to freeze in their present state, and the
message "Paused..." is printed. Subsequently, typing another "." single
steps to the next data update, but the plot and printout still remain frozen.
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