Sierra Video Ponderosa 3G Series Routing Switcher - Manual (Page 91)

PONDEROSA
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“N”: Input Status Inquiry
The command "N" requests that matrix status information for a single input be returned to
the host. This command is only useful on those router levels that allow an input to be
connected to at most one output. The status information is sent as a “Y” command or a
sequence of L “X” commands, where L=number of levels that allow an input to be
connected to at most one output (each such level generates a single “X” command of
status). Thus, a 6-level router with three single-output-per input levels would generate 3
“X” commands of status command output. A router that has all of its levels as single-
output-per-input may return a single “Y” command instead of individual “X” commands if
all of the levels are connected to the same output. The “X” and “Y” commands are
formatted exactly as with the "O" command.
For example, the command:
**N4!!
to a router might have the following three commands as its response:
** X12,4,2 X-,4,3 X0,4,4 !!
giving the status of levels 2, 3, and 4 (level 1 presumably not being a single-output-per-
input level). Note that on level 3 the ë-ë (dash) indicates that the input is disconnected,
and on level 4 the 0 indicates that the connection to the input is either unknown or that
input does not exist or is not available on that level.
If the router has only one level, or if all levels are connected the same, it might instead
use the Y command. For example:
** Y12,4 !!
“S”: Status Inquiry
Use command S to request that status information be returned to the host. The status
information is sent as a string of L x O substrings, where L = number of levels and O =
number of outputs. Each level/output combination generates a single substring of status.
Thus, a 21-level 16 output router would generate 2x16 = 32 substrings of status
command output. The length of each substring depends on the size of the particular
switcher involved. Larger switchers use bigger numbers for inputs, outputs, and levels.
The first substring of status is for level 1 output 2, etc.; however, each substring contains
the level and output numbers, so the sequence in which the data is sent is not important).
The first characters of each substring are a space followed by “X”, then the output
number, a comma character, the input number connected to the output (or 0 if no
connection exists), another comma, and finally the level number at which the input-output
pair is connected. For example, the command:
**S!!
might have the following two substrings at the beginning of its response:
**x01, 12, 1 x02, 02, 1!!
This indicates that output 1 is connected to input 12 on level 1, and that output 2 is
connected to input 2 on level 1.
The number of digits used for each number is generally the maximum number of digits
ever required for that particular switcher. Thus, a switcher with between 10 and 99 inputs
would use two digits for the input number, and a switcher with less than 10 levels would
use one digit for the level number.