Digital Projection Vision 30 Series, Руководство по протоколу связи

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Communication Protocol
This section describes how to use the communication protocol to control projectors remotely.
When the projects are connected to either RS232 or LAN you can control the projectors through this ASCII based protocol.
Note: Some commands will generate OSD feedback. This can be turned off from the projector’s menu system or by setting
“OSDC” to value 0 (OSD off) or value 1 (OSD show only warnings).
Overview
The protocol has the following definition:
HEADER SEPARATOR ADDRESS SEPARATOR MESSAGE BODY TERMINATOR
1 byte 1 byte 1 -3 bytes 1 byte N bytes 1 byte
Field Description Comment
Header ASCII character ‘:’ Required
Separator ASCII character ‘space’ Optional
Address 1 – 3 bytes address Optional
Terminator CR carriage return (0x0D) Required
Message body
The message body structure is as follows:
MNEMONIC SEPARATOR] MODIFIER SEPARATOR VALUES
1 byte 1 byte 1 -3 bytes 1 byte N bytes
Field Description Comment
Mnemonic 4 bytes key identifier, not case sensitive Required
Modifer Single char symbol Optional
VALUES 1 – 3 bytes address Optional
Separator ASCII character ‘space’ Optional
Mnemonic
The Mnemonic is 4 bytes key identifier, know as the ASCII command.
Example: POWR, SABS, IVGA
Modifiers
R Relative change. Value given will be reletive to the existing value.
Example: :BRIG R10 will increase brightness with 10 steps
A Request acknowledges. This modifier is the only
used to read back the result of the command.
Default all commands send acknowledges so this will not be
necessary.
? Get current value
?M Get maximum value
?N Get minimum value
?D Get default value
?S Get default step value