Error Message; Request Status Return; Timing - Pioneer DVD-V7400 Command Protocol Manual

4.5

Error Message

An error message consists of an E followed by a two-character error code.
Example:
The error message occurs when the given command cannot be processed.
4.6

Request Status Return

In response to a single request command, the status returns as a line of letters
terminated by <CR>.
If multiple commands are sent within the same String, the player returns a
separate status value upon completion of each command. A status value is a
character string with a <CR> termination code.
Example:
When the command is at the end of the command string, the R within the
completion message is omitted.
Example:
Example:
4.7

Timing

A player needs a brief period after receiving a command before returning a
Status Value or "R <CR>". It is defined as follows:
T1 represents the time between the termination of the command string
<CR> received
approximately 35ms maximum.
T2 represents the time for executing the command, depending upon the
command type and the player's condition. In case of a status request
command such as "?F", T2 requires less than 1ms.
T3 represents the time that is needed for transferring data (TxD) per byte.
It requires a maximum of 4ms per byte. In case of the return data for "?F"
request, a player is supposed to be back 8 bytes data, that is composed
of 7 digit Frame number and "<CR>". In this case the transfer time of
each byte is not exactly the same with 4ms, it takes usually around 10ms
for transferring 8 bytes data total, and it is supposed to take less than
16ms.
EN N <CR>
1 2
⇒
?C?F<CR>
⇒
ST?F<CR>
⇒
?FST<CR>
and the beginning of the command execution. It is
- 12
Command Structure
02<CR>
10260<CR>
23005<CR> (completion omitted)
23005<CR>R<CR> (not omitted)