About ENQ

Integer ASCII code: 5
Binary code: 0000 0101
Octal code: 5
Hexadecimal code: 05
Group: control
Seq: ^E

Unicode symbol: , int code: 9221 (html &#9221) hex code: 2405 (html &#x2405)


Enquiry is a signal, which has a purpose of initiating a response at the receiving end, in order to make sure that it's still available.

Let's find out the meaning of enquiry in computer communications. Here enquiry means a transmission-control character that is intended to get the reply from the receiving station, with which was established a connection. Basically, enquiry is a signal that is purposed to initiate a response at the receiving end, in oder to make sure that it is still there. The reply is represented in an answer-back code to the exact terminal that sent the WRU (who are you) signal. The reply can contain station identification, type service equipment, and the current status of the remote station.

Teletype Model 33 answer-back drum (brown, lower center left) for implementing the function of coding inquiry response message.

There were some teleprinters, which had in their possession a "programmable" drum. It could keep approximately a 20 or 22 character message. The encoding of the message on the drum was performed by breaking down tabs off the drum. A sequence like this could be sent straight to the one, who would receive an enquiry signal, if it was possible. The other option was just to press the "Here is" key on the keyboard.

An enquiry character was possessed by the 5-bit ITA2. ASCII and EBCDIC, which were developed later, have adopted it as well.

In the 1960s, DEC decided to deactivate the function of answerback on Teletype Model 33 terminals. This happened because it wasn't compatible with the correct use of the paper-tape reader and binary data punch. Despite this fact, the DEC VT100 terminals, created starting from 1978 answered to enquiry using an answerback message, that could be customize to any user. Their successors have successfully adopted it.


MD5 Enquiry

input value base output hash
ENQ char 8BB6C17838643F9691CC6A4DE6C51709
5 dec E4DA3B7FBBCE2345D7772B0674A318D5
00000101 bin 4EB0E9E1D6F1580598BAA36F2B828BBE
0000 0101 bin BEAFB066F6A62AA90FA61FA04DFB035B
5 oct E4DA3B7FBBCE2345D7772B0674A318D5
05 hex 751D31DD6B56B26B29DAC2C0E1839E34
0x05 hex 2964EF546789DCEFFBEA8DB80EB34CED

SHA256 Enquiry

input value base output hash
ENQ char E77B9A9AE9E30B0DBDB6F510A264EF9DE781501D7B6B92AE89EB059C5AB743DB
5 dec EF2D127DE37B942BAAD06145E54B0C619A1F22327B2EBBCFBEC78F5564AFE39D
00000101 bin B7CD5F330D159C06C14895ED68731A4BE28F898C52E352E0236A15BC5FEA4757
0000 0101 bin 8E0E628CB3CDA6815A937AD17E57C3DC42589B65B15EE6ADDBCB53F050A2438D
5 oct EF2D127DE37B942BAAD06145E54B0C619A1F22327B2EBBCFBEC78F5564AFE39D
05 hex C97550CE8213EF5CF6ED4BA48790C137DF3EF6A5DA20B48961001A634B6CEAD2
0x05 hex 4ED3E532D9FD93CE171DC9366226AFB75C10D03DAABF1B5BB56781F9D9BD7989

Base64 Enquiry

input value base output hash
ENQ char BQ==
5 dec NQ==
00000101 bin MDAwMDAxMDE=
0000 0101 bin MDAwMCAwMTAx
5 oct NQ==
05 hex MDU=
0x05 hex MHgwNQ==
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 2018-2023 © Dmytro Koshovyi. Ukraine, Mykolayiv.