LASSEN SERIES 16 & 32 HD/SDI
35
Normally the server will assign remote addresses to its clients. However, it should always provide
a way to send these addresses to the client, because the client needs to know its address in
order to know how to interpret some responses. By simply passing each “M” response command
received from the router back to the client, the server can let the client know what its address is.
For example, the command:
** M139 K9664 !!
establishes password 9664 as the password for remote address 139. The response to this
command string would be:
** M139 OK !!
If remote address 13 later sends the command:
** M139 Y8,27 !!
to request that output 8 be connected to input 27, the router would check to see if output 8 has
been locked. If so, the router compares the password of remote address 139 (which has
previously been set to 96643) to the password that was used to lock output 8. If they match, the
connection request succeeds, but if they don’t match, output 8 is left unchanged.
“U”: Update Request on/off
The command "
U
" turns on or off the automatic sending of output change reports. The command
letter must be followed by either a number 0, 1, or 2 to specify the new automatic change report
state, as follows:
0: Automatic output change reporting is turned off.
1: Automatic output change reporting is turned on. Crosspoint change commands do not
immediately report changed status, but instead, the report comes up to a few seconds after the
crosspoint change command is received.
2: Automatic output change reporting is turned on, and crosspoint change commands
immediately report changed status as part of the response to the command.
Output change reports are automatic messages sent to the host whenever an output is
crosspoint status (i.e. connected source) is changed.
For example, the command:
**U1!!
turns on automatic output change reporting. When a crosspoint is changed, the following
message might be received:
** X5,17,3 !!<CR>
indicating that output 5 is now connected to input 17 on level 3. Alternatively, if the router has only
a single level or if all levels of the output are connected the same, it might send:
** Y5,17 !!<CR>
indicating that output 5 is now connected to input 17. Alternatively, newer routers might use the
“V” command instead of “X” commands to report a change:
** V5,17,12,0 !!<CR>
indicating that output 5 is now connected to input 17 on level 1, to input 12 on level 2, and does
not exist or is not available on level 3.
To turn off output change reporting, use the command:
**U0!!
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 !!<CR>
and then sometime later, perhaps up to several seconds later, the crosspoint change reports will
be sent as separate command sequences for each output:
