Sierra Video Pro XL Series 8 - Manual (Page 53)

GENERIC PROTOCOL
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Only supported connect commands (those connect commands whose command letters appear in
the "I" command response) may follow the register letter up to the tilde character. The connect
commands do not take effect until the register is triggered using the "T" command below.
The maximum allowed number of connect commands is determined by the particular router. In all
cases where this command is implemented, there is guaranteed to be space available to store at
least two complete switch matrices AT ONE LEVEL. If more connect commands are received
than there is space available to store them, the error response string "FULL ERROR Salvo Space
Full" is sent to the host, and only the first part of the salvo is stored. For example:
** FULL ERROR Salvo Space Full !!
says that the salvo request filled memory and the salvo could not be completely stored.
“B”: Output Lock inquiry or change
The command "B" requests that lock information for the specified output be returned to the host,
and optionally that the lock status of that output be changed. Whenever the router receives a “B”
command, it sends one back.
In routers that support the “B” command, the router reports changes to output lock status using
the “B” command, not the “G OUTPUT_LOCK” command.
When an output is locked, it cannot be routed to a new input unless the password sent using the
“K” command matches the password used to lock the output.
In virtual-mapped routers, this command applies lockouts to virtual destinations rather than
physical outputs
, so the word “output” should be replaced with “destination” in this command
description.
If the “password” and “lock” arguments are both 0, this is a query for lock status of the specified
output. A “B” command is sent to report the lock status.
If the “password” argument is not 0, this is a request to change the lock status of the specified
output. After changing the lock status, a “B” command is sent to report the new lock status, so a
response occurs regardless of which form of the “B” command is sent to the router.
When requesting that lock status be changed, if “lock” is 0, this is a request to unlock the output,
and if “lock” is 1, this is a request to lock the output. An attempt to lock an output that is already
locked, or to unlock an output that is already unlocked, fails, as does an attempt to unlock an
output using a password that is different from the password that the output was locked with and is
not the administrator password. Any use of a password larger than 9999 also fails. In any of those
cases, the output lock status remains unchanged and an error response is generated. The “B”
command response will indicate that the output still has the same lock state as before.
In the “B” command response that is sent by the router, the “password” argument is the current
lock password for the output (1-9999), or is 0 if the output is not locked, and the “lock” argument
is 0 if the output is not locked, or 1 if it is locked.
When locking an unlocked output, the specified password is recorded by the router as the lock
password for that output. When unlocking a locked output, the specified password is compared
by the router to the lock password for the output. If they match, or if the specified password is the
administrator password, the output is unlocked, else it remains locked. Attempting to lock an