Sony SRG-HD1 Technical Manual page 21

Timing Chart
If two or more commands are to be sent successively,
wait for a reply command (an Acknowledge or error
message for a general command, and an inquiry packet
for an inquiry command) of the previous command to
be received before sending the next command.
Controller
Command1
Command2
Be sure to wait for Acknowledge of
Command1 before issuing Command2.
Command and inquiry
Command

Sends operational commands to this unit.
Inquiry

Used for inquiring about the current state of this
unit.
Command Packet
Inquiry 8X QQ RR ... FF
QQ = 01 (Command), 09 (Inquiry)
1)
RR = 00 (Interface), 04 (camera 1), 06 (Pan/Tilter)
2)
X = 1 to 7: Address of this unit in the daisy chain*
* Locked to "X = 1" for VISCA over IP.
For actual values to be sent, see Command Lists or
Inquiry Command Lists.
Peripheral devices
Acknowledge of
Command1
Completion of
Command1
Acknowledge of
Command2
Completion of
Command2
Note
QQ = Command/Inquiry,
1)
RR = category code
2)
Responses for commands and inquiries
Acknowledge message

A message returned by this unit when it receives a
command. No Acknowledge message is returned for
an inquiry, cancel, or device setting command.
Completion message

A message returned by this unit when the execution
of command or inquiry is completed. In the case of
inquiry commands, reply data for the inquiry is
contained after the 3rd byte of the packet. If the
Acknowledge message is omitted, the socket number
will contain 0.
Acknowledge
Completion (Commands)
Completion (Inquiries)
X = 9 to F: Address of this unit specified when the command or inquiry is
executed + 8*
* Locked to "X = 9" for VISCA over IP.
Error message

When a command could not be executed or failed,
an error message is returned instead of an
Acknowledge message. In some commands (such as
zoom) in which the process is not completed
immediately after the Acknowledge message, an
error message may be returned after an
Acknowledge message. When an inquiry command
could not be executed or failed, an error message is
returned instead of a completion message.
Error Packet Description
X0 6Y 01 FF Message length error
X0 60 02 FF Syntax Error
X0 60 03 FF Command buffer full
X0 6Y 04 FF Command canceled
X0 6Y 05 FF No socket (to be canceled)
X0 6Y 41 FF Command not executable
X = 9 to F: Address of this unit specified when the command is executed
+ 8, Y = socket number*
* Locked to "X = 9" for VISCA over IP.
1
Reply Packet Note
X0 4Y FF Y = socket number
X0 5Y FF Y = socket number
X0 5Y ... FF Y = socket number