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What is the RI data signal?

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RI data signal, in the context of communication and data transmission, usually refers to the "Ring Indicator" signal.

This is a control signal used to indicate that a remote communication device (such as a telephone line or modem) is sending a call signal (such as a ring signal) to a local device.

Specifically, the role and characteristics of the RI signal can be summarized as follows:

Definition and role

Definition: The RI signal is a control signal sent by a data communication device (DCE, such as a modem) to a data terminal device (DTE, such as a computer). It is used to indicate that the DCE has received a call signal from a remote communication device (such as a telephone network).

Role: When the DCE (such as a modem) receives a ring signal from a remote call, it sends a high-level signal (may be a low level in some systems, depending on the system design) to the DTE (such as a computer) through the RI signal line. After receiving this signal, the DTE can know that a remote call is coming and perform corresponding processing accordingly, such as starting the communication software, displaying a call prompt, etc.

Characteristics and implementation

Level characteristics: The RI signal usually exists in the form of a high level or a low level, depending on the system design. In most systems, the high level of the RI signal indicates that a remote call is coming.

Physical connection: The RI signal line is usually connected to the serial communication interface between the data communication equipment (DCE) and the data terminal equipment (DTE). It is a control line in the interface harness, and together with other control lines (such as DSR, DTR, RTS, CTS, etc.), it forms a complete communication control system.

Functional implementation: In the process of data communication, the implementation of the RI signal depends on the detection circuit and signal processing logic inside the DCE. 

When the DCE detects a ringing signal from a remote communication device, it converts this signal into an RI signal through an internal circuit and sends it to the DTE through the RI signal line.

Application scenario

Telephone communication: In the scenario of data transmission over a telephone line, the RI signal is used to indicate a call signal on the telephone line. 

When the modem receives a ringing signal from the telephone network, it notifies the computer or other data terminal equipment through the RI signal.

Remote access: In remote access systems (such as dial-up Internet access through a modem), the RI signal also plays an important role. 

It helps users understand when a remote call is coming and start the corresponding communication software or application accordingly.

In summary, the RI data signal is a control signal sent by data communication equipment to data terminal equipment to indicate the arrival of a remote call.

It plays an important role in scenarios such as telephone communication and remote access, helping users to achieve reliable transmission and reception of data.

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Provides the data needed to display images. Data must be coordinated with the clock signal to transmit data to any display point. Generally, the red, green and blue data signals are separated in the display screen. 

If a data signal is short-circuited to the positive or negative pole, the corresponding color will appear fully lit or not. 

When the data signal is suspended, the corresponding color display is uncertain.

by (80.7k points)

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