Data Link Escape (DLE) is an ASCII communication-control character that lets a data-communication protocol change how a limited number of following characters are interpreted. Its ASCII value is 16 decimal, or 0x10 hexadecimal. What it does in a particular message depends on the protocol using it.
What does Data Link Escape mean?
RFC 20 defines DLE as a character that “will change the meaning of a limited number of contiguously following characters.” It is used to provide supplementary controls in data-communication networks. In short, DLE is a control character whose significance comes from the protocol context, rather than a universal instruction with the same effect in every system. RFC 20, ASCII format for network interchange
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What is the ASCII value of DLE?
In RFC 20’s ASCII table, DLE is at column 1, row 0: decimal 16, hexadecimal 0x10. Those are two ways of expressing the same character code. RFC 20
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RFC 20 gives DLE’s general purpose, but a protocol defines the specific sequences and actions associated with it. For example, Atlas Copco’s Open Protocol specification, version 2.16.0, describes DLE in its serial procedure using a 3964R handshake. In that implementation, it is involved in acknowledgements and in handling the message end and block check. Those details apply to that specification and version; they are not universal rules for all uses of DLE. Atlas Copco Open Protocol Specification, version 2.16.0
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How is DLE different from ESC?
DLE and ESC are separate ASCII control characters with different stated purposes in RFC 20. DLE is for supplementary communication controls in data networks; ESC (Escape) is intended to provide code extension in general information interchange. Their names sound similar, but the definitions do not make them interchangeable or establish ESC as a replacement for DLE. RFC 20
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