Recall command – Grass Valley Switcher Products User Manual
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Switcher Products — Protocols Manual
Section 3 — Peripheral Bus II Protocol
Recall Command
The controlling device sends a Recall command to a selected controlled
device to cause the controlled device to “recall” a previously stored effect.
The controlling device would send the Recall command some time in
advance of the vertical interval in which the controlling device will actually
perform the Recall. The controlled device’s response to the Recall
command should be to recall from its own memory the specified effect. No
further response from the controlled device is required.
The format for a Recall command is:
Rddddddrrr
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The first byte is the ASCII keyword for Recall, R (52H).
•
Next a six-byte field of ASCII characters (dddddd) acts as a bit map that
identifies which controlled devices are included in the Recall (see
•
Next the controlling device sends a three-byte field of ASCII characters
(rrr) representing a hex number that identifies the hex register number
from which the controlling device will recall the learned effect
(000H-FFFH).
•
A carriage return ends the message.