Sony fwd-42pv Manuale

3. Communication Data Format

(a)Control message

№

5
:
:

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

№

* 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

№

* 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)

№

4
:
:

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

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