Grass Valley Maestro Master Control Reference Manual v.2.4.0 - Manual (Page 100)

100 MAESTRO — Automation Interface Protocol Technical Reference Manual
Section 5 — Definition of Extended Maestro Commands
Packet Format Summary
Legacy
Legacy Command Packet:
<STX> <LEN> <CMD> <DATA> < CHKSUM>
Legacy Query Packet:
<STX> <LEN> <READ> <CMD> <DATA> <CHKSUM>
Legacy Query Reply Packet:
<STX> <LEN> <IFRE> <CMD> <DATA> <CHKSUM>
Maestro
<TransactionQueue> <Command ID> All Maestro Extended commands are preceded by the Transaction
Queue (1 hex byte) in which it is to be placed and the Command ID (2 hex bytes, MSB first).
<PREAMBLE> is used to indicate the following:
<0xFF> <TRANSACTION QUEUE> <COMMAND ID>
Maestro Extension Command Packet:
<STX> <LEN> <PREAMBLE> <CMD> <DATA> <CHKSUM>
Maestro Extension Query Packet:
<STX> <LEN> <READ> <PREAMBLE> <CMD> <DATA> <CHKSUM>
Maestro Extension Query Reply Packet:
<STX> <LEN> <IFRE> <PREAMBLE> <CMD> <DATA> <CHKSUM>