Grass Valley Performer SD - Manual (Page 162)

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Section 3 — Operation & Service
The Performer makes no use of the Power Supply status response.
If the destination address is different from the address set at
switch S1 the command is ignored. Received nulls, spaces,
carriage returns, and line feeds are ignored.
When STX is received in the middle of a command, the partial
command is purged, and a new command is started.
If a BREAK condition occurs, it purges anything received so far.
STX must be received to start a new command.
If any command is received with a syntax error, the command is
ignored.
When a Status Request command is received, any crosspoint that
has a source of 0 is source 1, and audio crosspoint 2 is set to be the
same as audio crosspoint 1.