User`s manual

Shasta 1616D
25
the administrator password in a “K” command, that will not permit the device to reroute
locked outputs (but it can use the administrator password to unlock locked outputs using
the “B” command).
Output lockouts apply on all levels. On virtual-mapped routers, a level may be left out of a
lockout by making sure the level is unmapped for the destination being locked.
As with all router configuration parameters, the output lockout data is stored in non-
volatile storage and thus is retained across router power-ups. When a router is first
initialized at the factory, all outputs are set to be unlocked.
This command provides the same functionality as the “G OUTPUT_LOCK” command.
This command, which was added at router software version V5.06, is preferred over that
command. Note that the output lock version number is not present in this command.
Since output lock status changes frequently, it is not really useful to cache output lock
status for outputs, so the output lock version number is not really useful.
For example, to request whether or not output 21 is locked:
** B21,0,0 !!
The response might be:
** B21,0,0 OK !!
indicating that output 21 is NOT locked. Or, the response might be:
** B21,6741,1 OK !!
indicating that output 21 is locked with password 6741. To clear this lockout:
** B21,6741,0 !!
To lock output 96 using password 439:
** B96,439,1 !!
If successful, the response would be:
** B96,439,1 OK !!
If output 122 becomes locked using password 235, the following change report would be
sent by the router:
** B122,235,1 !!
“F”: Field Delay
The command "F" is used to specify the delay between the time a crosspoint change
request is received by the router and the time the crosspoint switch actually occurs. It
must be followed by a number giving the number of video fields of delay desired. If the
number is smaller than the smallest delay that the router can handle, the smallest delay
is used instead. If it is larger than the largest delay the router can handle, the largest
delay is used instead. Note that this command does not cause a delay in command
processing, as the “D” command does.
To understand this command more fully, consider the way that router software will
typically handle a crosspoint command. The last character of the command string, the
final “!” (exclamation) character, is received somewhere in a particular video field, call it
video field 7. The router parses the command string and, for each crosspoint it contains,
it puts the crosspoint in a buffer that is marked to be delivered to the crosspoint hardware
on a particular video field. Suppose that previously, an “F5” command has been received.
Then crosspoint commands whose final “!” command string character was received on
video field 7 would be placed in a buffer that is marked to be delivered to the crosspoint
hardware at video field 13 (7+5+1=13).
To understand the reason for adding 1 in the previous sum, consider an “F0” command: it
would ask for output at the very next video field, field 8 in our case. So, it is necessary to
add the “F” argument plus 1 to the field number on which the crosspoint command is
received to get the field number at which the crosspoint will be output.