8
VISCA Command/ACK Protocol
* Not available for VISCA over IP.
Do not transmit the command (except Address Set, IF_Clear, Command Cancel and CAMERA POWER
SUPPLY (page 22)) when any menu is displayed on the screen. If displayed, clear the menu first using
MENU (page 22) Command, and then proceed.
Command Command
Message
Reply Message Comments
General
Command
81 01 04 38 02 FF
(Example)
90 4z FF (ACK) , 90 5z
FF (Completion)
(z: Socket No.)
Returns ACK when a command has been accepted,
or Completion when a command has been executed.
81 01 04 38 FF
(Example)
90 60 02 FF
(Syntax Error)
Accepted a command which is not supported or a
command lacking parameters.
81 01 04 38 02 FF
(Example)
90 60 03 FF
(Command Buffer Full)
Could not accept the command as there are two
commands currently being executed.
81 01 04 08 02 FF
(Example)
90 6z 41 FF
(Command Not
Executable)
(z: Socket No.)
Could not execute the command in the current
mode.
Inquiry
Command
81 09 04 38 FF
(Example)
90 50 02 FF
(Completion)
Does not return ACK for the Inquiry Command.
81 09 05 38 FF
(Example)
90 60 02 FF
(Syntax Error)
Accepted an incompatible command.
Address Set
*
88 30 01 FF 88 30 02 FF Always broadcasted. The device address number
plus 1 is returned.
IF_Clear
(Broadcast)
*
88 01 00 01 FF 88 01 00 01 FF The same command is returned.
IF_Clear (For x) 8x 01 00 01 FF y0 50 FF (Completion) ACK is not returned for this command.
Command Cancel 8x 2p FF y0 6p 04 FF
(Command Canceled)
Returned when the command of the specified socket
is cancelled. Completion for the command cancelled
is not returned.
y0 6p 05 FF
(No Socket)
Returned when the command of the specified socket
has already been completed or when the specified
socket number is wrong.
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