其标准规定了AT＆W AT命令？(Which standard specifies the AT&W

While discussing how to process AT commands with a colleague, we discovered that contrary to our belief the command AT&W (store user profile) is not specified in V.250 (it only specifies ATZ and AT&F, which are related), leaving us wondering - where is it specified then?

Update: Yes, we expected the command to have its origin in the Hayes command set, virtually all the basic syntax commands does. However, most of the Hayes command have been imported into formal standards like V.250 by ITU or 27.007 by 3GPP. Since V.250 did not import this command we were wondering that it might be because it was specified in some other standard.

And in any case other standards have defined various commands. Here is an extract from a comment I put in the source code when I were working with the AT+VTS command last year (which has by the way the most non-standard parameter syntax I have ever seen!).

The AT+VTS command originally originates from the standard TIA/EIA/IS-101, "Facsimile Digital Interfaces - Voice Control Interim Standard for Asynchronous DCE" from 1993 by Telecommunications Industry Association. This specification is now withdrawn and the AT+VTS command is now specified in ITU-T V.252 "Procedure for control of V.70 and H.324 terminals by a DTE".

Does anyone have a reference to a formal standard/documentation (like above) that defines AT&W ? We are not just looking for manufacturer documentation of some random modem (unless for the original Hayes modems).

Answer 1:

您要查找的是所谓的Hayes命令集，由海斯调制解调器推广。这是一个“ 事实上很久以前它是由V.250采用”标准。

维基百科有一个简短的介绍和历史，和微软有一个命令集的总结。

Answer 2:

经过一番搜索，我想我已经找到答案，我一直在寻找，但请，如果你碰巧有含有标准的引用添加额外的答案AT&W 。

海耶斯文档

虽然我还没有找到符合Smartmodem 1200或2400 Smartmodem调制解调器任何手动，我发现了称为纸海斯调制解调器的用户技术参考，其表示了有关以下AT&W ：

&W - Write Active Profile to Memory

The &W command stores certain command options and S-register values into 
one of the modem's two nonvolatile stored profile memory locations. The 
command options and register values stored depend on the particular 
modem. These are indicated in the user documentation for your modem. 
In addition, the AT speed and parity are stored, according to the values 
used at the time the command is issued.

------------------------------------------------------------------------
&W0     Store the Active Profile into Stored Profile 0
&W1     Store the Active Profile into Stored Profile 1
------------------------------------------------------------------------

我认为这涵盖了或多或少海耶斯两罚全调制解调器，所以我觉得这可能是最官方的参考，我得到。