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that requests a response from the receiving station with which a connection has been set up. It represents a signal intended to trigger a response at the receiving end, to see whether it is still present. The response, an answer-back code to the terminal that transmitted the WRU (who are you) signal,
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Some teleprinters had a "programmable" drum, which could hold a 20- or 22-character message. The message was encoded on the drum by breaking tabs off the drum. This sequence could be transmitted upon receipt of an enquiry signal, if enabled, or by pressing the "Here is" key on the keyboard.
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routinely disabled the answerback feature on
Teletype Model 33 terminals because it interfered with the use of the paper-tape reader and punch for binary data. However, the DEC
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terminals from 1978 responded to enquiry with a user-configurable answerback message, as did its successors.
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may include station identification, the type of equipment in service, and the status of the remote station.
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This article is about computer communications. For the process of solving a problem, see
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answer-back drum (brown, lower center left) for coding inquiry response message
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219:. Digital Equipment Corporation. February 1966. p. 5-2. F-87.
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114:"Enquiry Character: Definition and additional resources from ZDNet"
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Browser Test Page for
Unicode Character 'ENQUIRY' (U+0005)
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