Command and inquiry
Command
z
Sends operational commands to the BRC-300/P.
z
Inquiry
Used for inquiring about the current state of the
BRC-300/P.
Command Packet
Inquiry
8X QQ RR ... FF
1)
QQ = 01 (Command), 09 (Inquiry)
2)
RR = 00 (Interface), 04 (camera 1), 06 (Pan/Tilter)
X = 1 to 7: BRC-300/P address
Responses for commands and inquiries
ACK message
z
Returned by the BRC-300/P when it receives a
command. No ACK message is returned for
inquiries.
z
Completion message
Returned by the BRC-300/P when execution of
commands or inquiries is completed. In the case of
inquiry commands, it will contain reply data for the
inquiry after the 3rd byte of the packet. If the ACK
message is omitted, the socket number will contain a
0.
Reply Packet
Ack
X0 4Y FF
Completion (commands)
X0 5Y FF
Completion (Inquiries)
X0 5Y ... FF
X = 9 to F: BRC-300/P address + 8
Error message
z
When a command or inquiry command could not be
executed or failed, an error message is returned.
Error Packet
Description
X0 6Y 01 FF
Message length error
X0 6Y 02 FF
Syntax Error
X0 6Y 03 FF
Command buffer full
X0 6Y 04 FF
Command cancelled
X0 6Y 05 FF
No socket (to be cancelled)
X0 6Y 41 FF
Command not executable
X = 9 to F: BRC-300/P address + 8, Y = socket number
Note
QQ
1)
= Command/Inquiry,
2)
RR
= category code
Note
Y = socket number
Y = socket number
Y = socket number
Socket number
When command messages are sent to the BRC-300/P,
it is normal to send the next command message after
waiting for the completion message or error message
to return. However to deal with advanced uses, the
BRC-300/P has two buffers (memories) for
commands, so that up to two commands including the
commands currently being executed can be received.
When the BRC-300/P receives commands, it notifies
the sender which command buffer was used using the
socket number of the ACK message.
As the completion message or error message also has a
socket number, it indicates which command has ended.
Even when two command buffers are being used at
any one time, a BRC-300/P management command
and some inquiry messages can be executed.
The ACK message is not returned for these commands
and inquiries, and only the completion message of
socket number 0 is returned.
Command execution cancel
To cancel a command which has already been sent,
send the Cancel command as the next command. To
cancel one of any two commands which have been
sent, use the cancel message.
Cancel Packet
Cancel
8X 2Y FF
X = 1 to 7: BRC-300/P address, Y = socket number
The Command canceled error message will be returned
for this command, but this is not a fault. It indicates
that the command has been canceled.
Note
Y = socket number
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