Grass Valley Maestro Master Control Reference Manual v.2.4.0 - Manual (Page 163)

MAESTRO — Automation Interface Protocol Technical Reference Manual 163
Polling Options
Polling Options
Following are a couple of options for polling Maestro.
When Maestro is in the SELECT state, it is not necessary for automation to use BRKs, the POLL address, or the SELECT
address before issuing commands. Maestro can be directly commanded or queried. This is the preferable way of polling
Maestro. Since this application of the ESBus protocol is not a multi-drop environment, once automation is communicating
with Maestro and Maestro is SELECTed, it will only be communicating with Maestro.
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: 09 TEN (select address NOT required)
Maestro: 05 NAK - nothing to send (YET!)
Automation: 02 02 22 45 97 query TX_STAT (select address NOT required)
Maestro: 04 ACK - Maestro remains in SELECT state
Automation: 09 TEN
Maestro: 02 03 23 61 03 76 REM_MODE On
Automation: 04 ACK response
Automation: 09 TEN
Maestro: 02 03 23 45 02 93 TX_STAT = quiescent
Automation: 04 ACK response
Automation: 09 TEN
Maestro: 05 NAK - nothing to send
Automation: 09 TEN
Maestro: 05 NAK - nothing to send
. . .
In the case where UPDATE is used for REM_MODE, the above reduces to:
Automation: BRK 82 81 poll Maestro from IDLE state
Maestro: 04 ACK - remains in ACTIVE state
Automation: 82 80 02 03 3F 07 61 56 register for REM_MODE auto-updates
3F - Common Message Extension
07 - UPDATE
61 - REM_MODE
Maestro: 04 ACK - remains in SELECT state
Automation: 02 02 22 45 97 query TX_STAT
Maestro: 04 ACK
Automation 09 TEN
Maestro: 02 03 23 45 02 93 TX_STAT = quiescent
Automation: 04 ACK response
Automation: 09 TEN
Maestro: 05 NAK