Sony FWD-42PV1A Protocol Manual - Page 4

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