Introduction of PJLink
PJLink Working Group,
JBMIA Data Projector GroupWhat is PJLink

Purpose & Development of PJLink
PJLink provides an easy system to monitor and control video equipment which will further
spread into every aspect of our life – in companies, schools, public facilities, shops,
amusement facilities, etc.
The PJLink Class1 defined the basic specifications, to monitor and control projectors/
displays via a commonly-used network, and released it to the public in April 2005.
The PJLink Class2 was developed as extended edition of the Class1 – and released this inJuly 2016.

What PJLink provides
Regardless of the manufacture or the type of the product, the same controller andsoftware are available to unitarily control and monitor the products which support thePJLink. We believe the PJLink can enhance the usability of the product well.
Furthermore, in the case of implementation as a system, it is capable of leading to reduced
time and costs.

Concept of PJLinkCompany A
Projector

Company B
Projector

Company C
Projector

Controller

Smartphone

Display

TabletPC

Regardless of the manufacture or the type ofthe product, the same controller, PC andmobile device are available to unitarily controland monitor the video equipment which
support the PJLink.

Categories defined by PJLink
For PJLink, standards are defined for three categories.
■Connection
Procedures to connect the projector/display, and procedures forbeing recognized by the projector/display.
■Control
Procedures to control the projector/display, and procedures tomonitor the state of the projector/display.
■Command format
The command format to communicate with the projector/display.

About ClassFor PJLink, two Classes are defined.
■Class1
Defines control and monitoring specifications for basic
projector/display functions via a network.
■Class2
The following functions are expanded from the PJLink Class1.
■Device-search function■Spontaneous state-transmission function■Compatible with IPv6
■Control commandConnection
Regarding the connection category, procedures to start
communication and recognition between the projector/display
and the control equipment are defined.
Class2 is newly available for the projector/display-searchfunction, and its supports IPv6.
Connection
Projector 1
Projector 2

Recognition
SearchProjector 3

IPv6

ControlFor the control category, procedures necessary for control
equipment to control the projector/display, and procedures toget information about the state of the projector/display aredefined.
In Class2, the spontaneous status notification function is addedin the case of a change of the state of the projector/display.
Projector 1Control

Acquisition

Spontaneous status notification

Command Format

For the command format category, the command formats to set theprojector/display and to get information about the state thereof aredefined.
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1

Set system

Acquisition system

Microphone volume

Freeze state

Freeze control

Serial No.

Speaker volume

Software version

Lamp/filter replacement model No.

Name of input terminal

Set system

Filter used hours

Input resolution, recommended resolution

Acquisition system

Power-supplycontrolPower-supplycontrol

Number oflamps/used hours

Input switching

Input state

Acquisition ofequipment nameAv mute control

AV mute state

Acquisition of
manufacturer’s name

Error stateFuture Development
In addition to carrying out activities to widely spread PJLink,
the PJLink working group will work on the improvement of
PJLink to provide a more user-friendly environment for theusage of video equipment.