20
Command List
Responses for commands and inquiries
●
ACK message
Returned by the FCB-EX780S/SP when it receives a
command. No ACK message is returned for
inquiries.
●
Completion message
Returned by the FCB-EX780S/SP 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 0.
Reply Packet
Note
Ack
X0 4Y FF
Y = socket number
Completion (commands)
X0 5Y FF
Y = socket number
Completion (Inquiries)
X0 5Y ... FF
Y = socket number
X = 9 to F: FCB-EX780S/SP a 8
●
Error message
When a command or inquiry command could not be
executed or failed, an error message is returned
instead of the completion message.
Error Packet
Description
X0 6Y 01 FF
Message length error (>14 bytes)
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: FCB-EX780S/SP a 8, Y = socket number
Socket number
When command messages are sent to the FCB-
EX780S/SP, 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 FCB-EX780S/SP has two buffers
(memories) for commands, so that up to two
commands including the commands currently being
executed can be received. When the FCB-EX780S/SP
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, an FCB-EX780S/SP
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 IF_Clear command as the next command. To
cancel one of any two commands which have been
sent, use the cancel message.
Cancel Packet
Note
Cancel
8X 2Y FF
Y = socket number
X = 1 to 7: FCB-EX780S/SP address, Y = socket number
An error message will be returned for this command,
but this is not a fault. It indicates that the command has
been canceled.
