GRASS VALLEY PERFORMER, Instruction Manual

Page: 151 / 182

3-33
Serial Protocol Descriptions
If a carriage return is received before a command string is
complete, the Performer will display ERR P for about half a
second in the status display. ERR P will also be displayed on
receipt of parity/overrun, checksum, or syntax errors.
Command Strings
Commands, <Data>, must consist of exactly <Len Hi> <Len Lo>
characters forming a string of zero or more commands. Each
command must consist of a single <CMD> character identifying
the command, followed by any <Data> required by that
command. The following command characters and data are
supported.
<Cmd> <Data> Description
D (44H) <Sources> Data preset, source to destination
A (41H) (None) All-destination Take of current preset
matrix
T (74H) <Dest> Take of specified destination only
P (50H) <Dest> Protect specified destination (must be
refreshed every 30 seconds)
C(43H) <Dest> Clear protect on specified destination
R (52H) (None) Reset Performer to factory defaults
Q (71H) <Dest> Query for status of specified destination
S (53H) <Status> Status response
Except for the S command, all of the above are sent by the
controller to the Performer. The S command is sent by Performer
to the controller in response to a Q (Query for status) command.
Performer generates a response to the Q command only.
The R command (Reset) causes Performer to initialize just as if
power had been turned off, then on. No data should follow the R
command.