Grass Valley Performer SD - Manual (Page 153)

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Serial Protocol Descriptions
<Src Hi> and <Src Lo> are two ASCII characters identifying the
source:
00 No Source
01 - 0A Source selection 1-10
<Dest Hi> and <Dest Lo> are two ASCII characters identifying the
destination.
01 Destination 1 (Performer has
only 1 destination)
Examples
In the following examples, we assume the Performer address is set
to 3C hex.
To preset level 3 of source 5 to destination 1, send these 12
characters:
<CR> 3C 07 D030501
In the example, spaces are used to separate <Adr> from <Len>
and <Len> from <Data>.
To cause the preset values to be taken to the switcher output, send
these 6 characters:
<CR> 3C 01 A
or, using the T command:
<CR> 3C 03 T01
To combine preset and take into a single command:
<CR> 3C 08 D030501 A
To query Performer:
<CR> 3C 03 Q01