Fwd-50Px3 Dedicated Protocol; Packet Format - Sony FWD-50PX3 Service Manual

5. Comm error
This is an error that occurs during communication with the
main control microcomputer of display equipment.
Timeout
When the received data is not sent after data transmission
Check Sum Error
When a check sum error occurs in the main control
microcomputer
Framing Error
When a framing error occurs
Parity Error
When a parity error occurs
Over Run Error
When an overrun error occurs
Other Comm Error
When other errors occur
Unknown Response
When data that cannot be processed is received
6. NVRAM error
Read Error
When the read operation from NVRAM fails
Write Error
When the write operation to NVRAM fails

4-8. FWD-50PX3 Dedicated Protocol

4-8-1. Packet Format

Command transmission to FWD-50PX3
Enquiry
No. Item Value
1 Header 0x83
2 Category 0xDX
3 Function 0xXX
4 Data1 0xXX
5 Data2 0xFF
6 CheckSum* 0xXX
* Checksum: If the value of a sum total of 1 to 5 exceeds 255 (1 byte), the
data of 1 lower byte is effective.
4-8
Remarks
The enquiry of an FWD series
protocol is used.
Command type 1 (Refer to the
category list.)
Command type 2
_
Fixed
Checksum for detection of
data destruction
Response from FWD-50PX3 to command
Enquiry 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.
Error answer (In case of abnormality)
No. Item Remarks
1 Header 0xE0: Answer
Answer *1
2 0x00: No Function Error
0x01: Check Sum Error
0x02: Data Length Error
CheckSum *2
3 0xXX
*1 0x00: No Function Error
A packet header, category, or function code
is not contained in this protocol.
0x01: Check Sum Error The checksum value of the received packet is
incorrect.
0x02: Data Length Error The data size of the received packet is
incorrect.
*2 Checksum: If the value of a sum total of 1 to 2 exceeds 255 (1 byte),
the data of 1 lower byte is effective.
Enquiry answer (In case of normality)
No. Item Value
1 Header 0x70
2 Answer 0x00
3 Length 0x03
4 Data1 0x20
5 Data2 0xXX
6 CheckSum* 0xXX
* Checksum: If the value of a sum total of 1 to 5 exceeds 255 (1 byte), the
data of 1 lower byte is effective.
Remarks
The answer of an FWD-50PX3
protocol is used.
0x03: Command Canceled
Checksum for detection of
data destruction
Remarks
The answer of an FWD-50PX3
protocol is used.
0x00: Command Completed
Data size
Fixed
Command type (Refer to the
normal command list and data
command list.)
Checksum for detection of
data destruction
FWD-50PX3