Grass Valley Maestro Master Control Reference Manual v.2.4.0 - Manual (Page 164)

164 MAESTRO — Automation Interface Protocol Technical Reference Manual
Section 6 — Examples
. . .
Manual intervention - Auto Defeat pressed on Maestro
Automation: 09 TEN
Maestro: 02 03 23 61 02 77 REM_MODE = Off
Automation: 04 ACK response
Automation: 09 TEN
Maestro: 05 NAK
. . .
Another method for polling Maestro, less preferable due to the overhead of ESBus state machine processing, is to poll
from the POLL state and act upon Maestro responses. If automation was being used in a multi-drop environment, this is
the polling/command method that would be required. This requires selection of Maestro before every command, TEN,
etc., and requires numerous passes through the IDLE state. It should be noted that reception of a BRK character forces
Maestro to abort any transmissions that may be in progress and may affect throughput due to the need to resend.
Automation: BRK 82 81 poll Maestro from IDLE state
Maestro: 04 ACK - remains in ACTIVE state
Automation: 82 80 02 02 22 61 7B SELECT and query REM_MODE
Maestro: 04 ACK - remains in SELECT state
Automation: BRK 82 81 poll Maestro from IDLE state
Maestro: 04 ACK - remain in ACTIVE state
Automation: 82 80 02 02 22 45 97 SELECT and query TX_STAT
Maestro: 04 ACK - remains in SELECT state
Automation: BRK 82 81 poll Maestro from IDLE state
Maestro: 08 SVC - Maestro has a message to send
Automation: 82 80 09 SELECT and TEN
Maestro: 02 03 23 61 03 76 REM_MODE = On
Automation: 04 ACK response
Automation: BRK 82 81 poll Maestro from IDLE state
Maestro: 08 SVC - Maestro has a message to send
Automation: 82 80 09 SELECT and TEN
Maestro: 02 03 23 45 02 93 TX_STAT = quiescent
Automation: 04 ACK response
Automation: BRK 82 81 poll Maestro from IDLE state
Maestro: 04 ACK - remains in ACTIVE state
Automation: 82 81 poll from ACTIVE state
Maestro: 04 ACK - remains in ACTIVE state
. . .