Sony BKM-FW50 Service Manual page 34

Response from BKM-FW50 to data transmission
Control answer (In case of abnormality)
No. Item Value
1 Header 0x70
2 Answer 0x03
3 CheckSum* 0x73
* Checksum: If the value of a sum total of 1 to 2 exceeds 255 (1 byte), the
data of 1 lower byte is effective.
Control answer (In case of normality)
No. Item Value
1 Header 0x70
2 Answer 0x00
3 CheckSum* 0x70
* Checksum: If the value of a sum total of 1 to 2 exceeds 255 (1 byte), the
data of 1 lower byte is effective.
Category list
. All commands and data items shall be classified as
shown in the table below.
. Before adding a new category, examine carefully
whether it is data which should be put in a function.
Outline Detailed contents
Normal command Used during normal command
transmission transmission.
* A data type is specified using
a function.
Normal command Used when abnormality
response occurred in the response
(Abnormal) during command transmission.
* A data type is specified using
a function.
* A error type is specified using
a Cmd2.
Data transmission Used during data transmission.
* A data type is specified using
a function.
* A data number is specified
using a Cmd2.
5-10
Remarks
The answer of an FWD series
protocol is used.
0x03: Command Canceled
Checksum for detection of
data destruction
Remarks
The answer of an FWD series
protocol is used.
0x00: Command Completed
Checksum for detection of
data destruction
Data
0xD1
0xD2
0xD3
5-8-2. ID Talk for Player Command List
Symbols in table
(*1): ID Talk Enquiry
(*2): FW50 Answer
(*3): ID Talk Control
(*A): Refer to the description below.
(*a), (*b), (*c): Refer to Section 5-8-3.
. An ID Talk for Player command is sent in the sequence
shown in the table.
. Send an "ID Talk Start" command first when using ID
Talk for Player. Send an "ID Talk Stop" command
lastly when terminating ID Talk for Player.
However, it is not necessary to assign "ID Talk Start/
Stop" before and after each command when sending
other commands.
. A (*A) command that requires the getting of semaphore
must transmit a Get semaphore command at the
beginning of a command sequence. Moreover, a Release
semaphore command must be transmitted at the end of a
sequence.
. A command that does not require the getting of
semaphore cannot be transmitted with the semaphore not
released (the semaphore gotten) after semaphore is
gotten using other commands. (The result of command
transmission appears as an error, and semaphore is
released if the semaphore getting state is entered.)
BKM-FW50