Sony FWD-42PV1 User Manual
Page 3
3. Communication Data Format
(a)Control message
№
1
2
3
4
5
:
:
X
X+1
* Check Sum: The total from №1 to №X, when value exceeds 255, 1byte of data is confirmed the bottom.
* When sending controls in sequence, keep interval of more than 500ms between the commands.
* When sending an enquiry right after sending the control of a same command, also keep interval of more than 5
between the commands.
(b)Enquiry message
№
1
2
3
4
5
6
* Check Sum: The total from №1 to №5, when value exceeds 255, 1byte of data is confirmed the bottom.
(c)Answer message
(1)Control answer
№
1
2
3
* 0x00: Completed
Normal response.
0x01: Limit Over
The packet was received normally, but the data value was over the upper limit.
Forcedly the monitor adjusted the data to maximum value.
0x02: Limit Under
The packet was received normally, but the data value was under the lower limit.
Forcedly the monitor adjusted the data to minimum value.
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.
(2)Enquiry answer (Complete)
№
1
2
3
4
:
:
X
X+1
* 0x00: Completed
Normal response.
* Return Data returns the read value.
* Check Sum: The total from №1 to №X, when value exceeds 255, 1byte of data is confirmed the bottom.
Return DataX
Check Sum
0xXX
0xXX
:
0xXX
:
0xXX
Return Data Size
0xXX
Return Data1
0xXX
Header
0x70: Answer
Answer
0x00: Completed
Check Sum
0xXX
Item
Value
0x02: Limit Under
0x03: Command Canceled
Item
Value
0x01: Limit Over
Item
Function
Answer*
0x70: Answer
0x00: Completed
0x8C: Control
Category
0xXX
Function
Header
DataX
Header
Data1（Length）
Data2（Data1）
Check Sum
:
:
Check Sum
0xXX
0xXX
0xXX
0xXX
0xXX
0xXX
0xXX
Value
Header
0x83: Enquiry
Category
0xXX
0xXX
Data1
0xFF
Data2
0xXX
0xFF
Item
Value