SIERRA VIDEO SYSTEMS
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“L”: Matrix Size and Level Names Inquiry
The command "
L
" requests that matrix size (Nout, Nlvl, Nin) and level name information (lvl1, lvl2,
etc.) be returned to the host. The information is sent as a string of characters. The first characters
are a space followed by "
L
", some optional values described below, then the number of outputs
(Nout), a comma, the number of levels (Nlvl), a comma, the number of inputs (Nin), a comma,
and then the level names, each terminated by a "~" (tilde), and the last followed by two tildes.
For example, the command:
**L!!
might return the following string:
** L64,3,32,VIDEO~AudioL~AudioR~~ OK !!<CR>
indicating that the router has 64 outputs, 3 levels, and 32 inputs, and the levels are named
"VIDEO", "AudioL", and "AudioR".
“O”: Output Status Inquiry
The command "
O
" requests that matrix status information for a single output be returned to the
host. The status information is sent as a “Y” command or a “V” command or as a sequence of L
“X” commands, where L=number of levels.
For example, the command:
**O5!!
to a 3-level router might have the following three commands as its response:
** X65,23,1 X5,-,2 X5,0,3 !!
Note the dash, indicating that on level 2, output 65 is not connected to an input. Also note the 0,
indicating that the connection on level 3 is either unknown or that output 65 doesn’t exist or isn’t
mapped on level 3.
Or, a 3-level router might have the following single command as its response:
** V65,23,-,0 !!
which has the same information as the three X commands in the previous example.
If the router has only one level, or if all levels are connected the same, the router might instead
use the
Y
command. For example:
** Y65,23 !!
