Grass Valley Maestro Master Control Reference Manual v.2.4.0 - Manual (Page 161)

MAESTRO — Automation Interface Protocol Technical Reference Manual 161
Section
6
Examples
Maestro State Progression
Maestro will progress through, and remain in, certain protocol states based upon the current state and received data.
IDLE state: A BRK character is required to proceed to the ACTIVE state and from the ACTIVE state one can proceed to
either the POLL or SELECT state.
In order to proceed to the POLL state, use BRK followed by the poll address:
Automation: BRK 82 81 proceed to POLL state
Maestro: 04 ACK - Maestro remains in ACTIVE state
In order to proceed to the SELECT state, use BRK followed by the select address:
Automation: BRK 82 80 proceed to SELECT state
Maestro: 04 ACK - Maestro remains in SELECT state
ACTIVE state: Maestro will remain in the ACTIVE state after reception of a BRK character or after successful POLL
processing.
In order to proceed to the POLL state, use the poll address:
Automation: 82 81 proceed to POLL state
Maestro: 04 ACK - Maestro remains in ACTIVE state
In order to proceed to the SELECT state, use the select address:
Automation: 82 80 proceed to SELECT state
Maestro: 04 ACK - Maestro remains in SELECT state
SELECT state: Maestro will remain in the SELECT state after entry into the SELECT state and after successful SELECT
state processing.
In order to remain in SELECT state, SELECT state processing must be successful:
Automation: SELECT state message
Maestro: 04 ACK - Maestro remains in SELECT state