Enquiry

Enquiry is the sixth Unicode character, it is located in the Basic Latin block and is Unicode number U+0005, it is a transmission control character, however it does have some other uses.

Transmission Control
As a transmission control character, Enquiry is used to request 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 if it is still present. The response, an answer-back code to the terminal that transmitted the WRU (who are you) signal, may include station identification, the type of equipment in service, and the status of the remote station. In simpler words would an enquiry is send, it request a response (which can be a different message or command) from the station receiving it if a connection has been set up. It also represents a signal that is intended to trigger or start a response at the end of the reciever, to see if it's still present. The response is normally an answer to code terminal that transmits the WRU signal, which may include identification for the station, the type of equipment used in service, and also the status of the remote (or inactivated) station. If one were to explain this in a summary, it simply is a signal intended to trigger a response at the receiving end, to see if it is still present. It is also used to be generally used by a master station to ask a slave station to send its next message. A slave station indicates that it has completed its transmission by sending the end of transmission character.

Other
Currently None