Grass Valley Performer SD - Manual (Page 152)

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Section 3 — Operation & Service
The D command allows matrix crosspoints to be preset but not
actually activated. A subsequent A or T command causes preset
values to take effect. This can be useful when you wish to switch
several switchers on a particular video field and thus have no time
to send several messages. The D command is used to set up the
switchers; then a series of short A commands to each switcher
initiates the switch.
The A and T commands both set all levels. D commands should be
sent to set the values of any level which are not to be the same as
in the last A or T command (source 1 initially).
Data
Data to be inserted following a command character are:
<Sources> = <Lvl Hi> <Lvl Lo> <Src Hi> <Src Lo> <Dest Hi>
<Dest Lo>
<Dest> = <Dest Hi> <Dest Lo>
<Status> = <PC> <Lvl Hi> <Lvl Lo> <Src Hi> <Src Lo>
<Dest Hi> <Dest Lo>
<PC> is P(50H) if protect active, C (43H) if protect clear
<Lvl Hi> 0-F, high nibble of level
<Lvl Lo> 0-F, low nibble of level
<Src Hi> 0-F, high nibble of source
<Src Lo> 0-F, low nibble of source
<Dest Hi> 0-F, high nibble of destination
<Dest Lo> 0-F, low nibble of destination
<Lvl Hi> and <Lvl Lo> are two ASCII characters identifying the
switcher level:
00 All Levels (AFV)
01 Video
02 Audio 1
03 Audio 2