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What is ETX?
ETX, also known as the “End of Text,” is a control character used in computer communications. It is represented by the ASCII code 0x03. In several computer protocols, including those for text transmission over networks, ETX serves as a signaling symbol to mark the end of a data transmission block or the termination of a message.
Types of control characters
Control characters are special characters that are not intended to be displayed as part of the text, but rather to control specific functions or representations in the communication system. Apart from ETX, there are several other control characters commonly used in computer systems. Let’s explore a few of them:
1. STX (Start of Text):
STX is another control character represented by the ASCII code 0x02. It is often used to denote the beginning of a text block or message. STX and ETX are frequently used together to encapsulate a particular section of a message.
2. ACK (Acknowledgment):
ACK is a control character used as an acknowledgment sent by the receiving party to confirm that it has received and processed a message or a block of data successfully. It is represented by the ASCII code 0x06.
3. NAK (Negative Acknowledgment):
NAK is a control character used as a negative acknowledgment sent to indicate that the receiving party has encountered an error or has not been able to process the received message or data block successfully. It is represented by the ASCII code 0x15.
How to use control characters
Control characters, including ETX, are primarily utilized in computer-based communication systems to indicate specific instructions or signal the beginning and end of data blocks or messages. Their usage varies depending on the protocol or application in which they are employed.
For example, in a network communication protocol, ETX can be utilized to delimit the end of a file being transmitted. When the receiving system detects the ETX control character, it knows that it has received the complete file.
Similarly, in industrial automation systems, control characters such as STX and ETX can be employed to enclose information packets within a larger control message. This allows the receiving device to accurately identify and extract the relevant data within the message.
Overall, the usage of control characters requires adherence to the specific protocol or communication standard being employed. It is essential to refer to the appropriate documentation or specifications provided by the system or protocol developers to ensure correct implementation.
In conclusion, ETX is a control character used to mark the end of a data transmission block or the termination of a message. Alongside other control characters like STX, ACK, and NAK, it plays an essential role in facilitating communication and ensuring the accurate transmission of information in computer systems.
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