Building intercom and elevator linkage integration solution

[ Pacific Security Network News ]
Elevator is the most important boarding tool for people in intelligent building intercom. Effective safety control and energy-saving management of elevators are urgent needs of more and more intelligent community projects. The elevator control system is combined with the building intercom system to intelligently summon and control the elevator, thus realizing the successful experience of visual intercom and elevator linkage control.
The card swipe function, that is, the card must be swiped to use the elevator, otherwise all the controlled floor buttons of the elevator will be invalid;
Video intercom linkage function (communication protocol acquisition method);
Save the ladder record query report;
The function of setting floor permissions;
Automatic fire escape function and manual release function;
In a networked manner, all elevator controllers are connected to the management computer via a bus, enabling the computer and controller to exchange data in a convenient and timely manner (ie, the computer can download the parameters necessary for the controller to be downloaded to the controller via the bus and can pass The bus acquires the operating status of each controller).
System functions
The intelligent building intercom and elevator linkage integration solution enables visitors to take the ladder without the use of a card or remember password, and only reach the floor where the resident is located, but cannot enter other floors, which solves the problem. The problem of community security also solves the problem of visitors using ladders.
When the visitor visits, after the communication with the owner through the video intercom system is completed, the owner opens the door according to the opening key on the video intercom extension; the unit door is opened, the visitor enters, and the elevator one floor outgoing button is activated, and the elevator is activated according to itself. The priority ladder program sends the nearest elevator to the first floor; when the elevator reaches the first floor and opens the door, the system opens the access layer permission and starts timing waiting (this time can be set, during which time the visitor wants to go to the floor button Can be activated), allowing visitors to manually register the floor they want to visit after entering the car, while other floor buttons are invalid.
To achieve the above functions, there are two ways to choose:
(1) Communication protocol collection method
The building intercom system "elevator controller" collects the "unlock" button signal of each intercom extension and provides a communication protocol to realize the communication between the building intercom system and the elevator floor control system; the elevator floor control system from the "elevator controller" The owner's floor signal is obtained, so that the elevator button of the floor can be registered within a certain time after the elevator is opened, and the visitor enters the elevator and presses the button to reach the corresponding floor.
(2) Hardware acquisition method
The building intercom system "elevator controller" can also provide the "unlock" button signal for each intercom extension (the elevator control expander needs to be added to the building with more than 12 floors) and transmit it to the elevator as a contact signal. The floor signal collector of the floor control system; the elevator floor control system obtains the button signal of the owner unlocking, and memorizes the floor address, so that the elevator button of the floor can be activated after a certain time in the elevator reaching the first floor and opening the door, the visitor Press the button to reach the corresponding floor.

HDMI, known as High Definition Multimedia Interface, is mainly used for transmitting HD audio and video signals.

There are three types of data transmitted by HDMI TMDS (plus Hsync and Vsync count as four) :

1.Preamble (control information) is mainly used to control the Data to be transmitted next, namely Data Island or Video Data

2.Data Island, all kinds of packet information, including audio packet, image packet, etc

3.Video Data, Video pixel Data. HDMI can transmit pixel Data in RGB and YUV formats

4. And Hsync and Vsync

HDMI Source device (HDMI HPD) will Monitor the Hotplug port of the sink device. If the Hotplug is High, it will prove that the device can work, and then read DCC; if it is low, it will prove that the device is disconnected.

The HDMI Sink device should notify the source device that EDID has been changed by pulling the Hotplug down, and the source device will read the new EDID again after the Hotplug is pulled up, which should be more than 100ms.

HDMI provides that the EDID can be read by DCC when the 5V pin of HDMI is powered on, that is, the Hotplug needs to be high, and some Hotplug is directly connected to the 5V

TMDS Clock is the Pixel Clock, the Clock frequency used for a Pixel point. Through TMDS Clock CLK pins transmitted to the receiver, but the receiver is not clear for what TMDS Clock frequency of the sender sent, so you need to through the Phy (Phy is analog to digital conversion section, is different from the ADC, Phy is don't know the sampling frequency, the need to lock frequency and phase lock, detect the exact input frequency) to lock.

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