Sony PVM-740 Interface Manual For Programmers page 7

SDCP request
Request Description
SET (00h) Specifies the command request. Status requests
are also considered as commands.
Response
Returns the result to the request sent from the host.
SDCP response
Response Description
NG (00h) Indicates that the request was invalid or
could not be completed.
OK (01h) Indicates that the request was
successfully completed.
Item no.
Defines the format of the information included in the
Data field.
Item no.
Value Description
B000h Indicates a monitor command.
B001h Indicates a monitor command for monitors with
built-in controllers.
Data length
Specifies the length (n) of the subsequent Data field (a
2-byte hexadecimal value).
The maximum value that can be specified is 499
(01F3h).
Example of normal communication
Data
Request Item No
Length
00h Item No. n
Example of response
SDCP SET
OK (01h) Item No. n
Example of error communication
If there is an error in the request, or if the request results
in an error, "NG" is returned as the response.
In this case, the Item no. field contains the item number
of the original request packet and the Error Code field
contains a 1-byte category and a 1-byte error code.
Refer to "SDCP error codes" (page 7) for the list of
categories and error codes.
Data
Set Data (n byte)
Get Data (n byte)
Error response
NG (00h) Item No.
Support for broadcast communication
The broadcast communication via UDP is supported for
controlling more than one monitor from a single
controller. In this configuration, monitors do not return
any response to commands.
SDCP error codes
The following table lists the SDCP error codes (not all
of the error codes are implemented.) For description of
the errors, refer to the subsequent paragraphs.
SDCP error codes
Category Error
Communication Check Sum Error
Error
Other Communication Error 50h
(F0**h)
Communication Error
This type of error indicates a communication error
between the controller and the main control
microcomputer of the display.
Check Sum Error: A check sum error occurred at the
main control microcomputer.
Other Communication Error: Another type of
communication error occurred.
2 Error Code (16)
Error Code
10h
7
Command Block Format