Grass Valley Performer SD - Manual (Page 158)

3-40
Section 3 — Operation & Service
Enable Protect Message
The Enable Protect message is sent from computer to Serial
Interface.
Protect header “!” (21H) byte 0
Destination tens byte 1
Destination ones byte 2
Checksum high nibble byte 3
Checksum lo nibble byte 4
Line Feed 0AH byte 5
Enabled protects must be refreshed every 13 seconds or time-out
will occur. Time-out will result in release of protect. A 6 second
refresh interval is recommended.
Release Protect Message
The Release Protect message is sent from the computer to the
Serial Interface.
Protect header “:” (3AH) byte 0
Destination tens byte 1
Destination ones byte 2
Checksum high nibble byte 3
Checksum lo nibble byte 4
Line Feed 0AH byte 5