Sony FWD-42PV1A Protocol Manual page 4

(3)Enquiry answer (Command cancel)
Item
№
Header
1
Answer
2
3
Check Sum
0x03: Command Canceled The packet was received normally,but the command was cancelled because the
* Check Sum: The total from №1 to №2, when value exceeds 255, 1byte of data is confirmed the bottom.
(4)Error answer
№ Item
Header
1
Answer*
2
3
Check Sum
* 0x00: No Function Error
0x01: Check Sum Error
0x02: Data Length Error
Value
0x70: Answer
0x03: Command Canceled
0xXX
function was not in adjustable mode, such as "--" a function displayed as in user
menu.
Value
0xE0: Answer
0x00: No Function Error
0x01: Check Sum Error
0x02: Data Length Error
0xXX
Packet header,category of function codes do not exist in this protocol.
The "Check Sum" value of the packet which received is wrong.
The "Data Num" value of the packet which received is wrong.