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= Definitions = |
= Definitions = |
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The following subsections detail the specific terminology and descriptions used as well as special characters in communications between the controller and terminal. |
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== Terminology == |
== Terminology == |
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Revision as of 21:16, 27 September 2018
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PJLink is a standard for basic control and configuring of a Projector over a network interface. It was developed by the Data Projector Group within the Japan Business Machine and Information System Industries Association (JBMIA). [1] The aim of the standard is to define a manufacturer and model-independent interface for the configuration and monitoring of video displays. [2] [3]
Definitions
The following subsections detail the specific terminology and descriptions used as well as special characters in communications between the controller and terminal.
Terminology
| Term | Description |
|---|---|
| Command | Data sent from Controller to Terminal |
| Controller | Device/software used to send commands to remote projector/display |
| Class | Version of applicable PJLink standard |
| Header | Start byte indicating a PJLink data packet |
| Packet | Network data byte(s) sent in one communication transfer |
| Parameter | Variable-length portion of packet that contains control setting or reply status Controller: Query or setting value Terminal: Status information or error code |
| Query | Packet requesting status or information from terminal |
| Reply | Data sent from Terminal to Controller |
| Separator | Byte in the packet that separates the command from the parameter |
| Terminal | Remote projector/display being controlled |
Special characters
| Mnemonic | Hex Code | Meaning | Description |
|---|---|---|---|
| % | 0x25 | Header | Start byte of PJLink packet |
| <cr> | 0x0d | Terminator | End byte of PJLink packet |
| <sp> | 0x20 | Space | Separator byte in command packet |
| = | 0x3d | Equal sign | Separator byte in reply packet |
Communication
Communication is via the TCP protocol. A command packet is sent from the controller, and a reply is returned by the terminal. The header, class, command, separator, and terminator will all be in the ASCII character set. The parameter may be either ASCII or UTF-8 character set.
A PJLink packet has the following characteristics:
| Header | Class | Command | Separator | Parameter | Terminator |
|---|---|---|---|---|---|
| 1 byte | 1 Byte | 4 bytes | 1 byte | 0-128 bytes | 1 byte |
Example query to request PJLink class terminal supports:
"%1CLSS<sp>?<cr>"
Example reply for PJLink class terminal supports:
"%1CLSS=1<cr>"
Notes
References
- ^ http://pjlink.jbmia.or.jp/english/
- ^ Specification of PJLink Class1 (PDF; 580 kB)
- ^ Specification of PJLink Class2 (PDF; 887 kB)