Sierra Video Pro XL Series 8 - Manual (Page 49)

GENERIC PROTOCOL
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The difference between an argument value of 1 versus 2 has to do with the response generated
by the router when it receives a crosspoint connect command (“V”, “W”, “X”, “Y”, or “Z”
command). For example, suppose the router sends the following crosspoint connect commands
in a single command sequence:
** Y1,18 Y8,34 !!
If U1 is in effect, the response to this command will be:
** OK !!
and then sometime later, perhaps up to several seconds later, the crosspoint change reports will
be sent as separate command sequences for each output:
** Y1,18 !!
** Y8,34 !!
On the other hand, if U2 is in effect, the response to the original crosspoint change command
sequence will be:
** Y1,18 Y8,34 OK !!
and no additional crosspoint change reports will be sent because they already HAVE been sent.
The U2 mode of operation is generally more convenient because it produces more immediate
feedback to the controlling device that is sending a crosspoint change command. The U1 mode of
operation is provided for compatibility with older control systems.
“V”: Connect Levels
The command "V" is used to request that a connection be made. It must be followed by an output
number, a comma, and a comma-separated list of input numbers, one for each level, up to the
number of levels in the router. Fewer than the number of levels may be specified if desired, and
the remaining levels will be left unchanged.
For example, the command:
**V12,7,8,9!!
says that connections are to be made to output 12: from input 7 on level 1, input 8 on level 2, and
input 9 on level 3.
An input number of 0 means the output connection is to be left unchanged.
An input number of ë-ë (dash) means the output is to be disconnected. If the router does not
support disconnected outputs, the output connection will be left unchanged.
“W”: Connect Outputs
The command "W" is used to request that a connection be made. It must be followed by a level
number, a comma, and a comma-separated list of input numbers, one for each output, up to the