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Modbus硬件控制03——485串口助手控制继电器 - 创客硬件开发 - 清泛IT社区...
本帖最后由 mzb2012 于 2025-08-28 21:58 编辑
1.软件准备485串口调试助手，它集成485调试功能，自带CRC校验，非常易于使用。
2.硬件连接
通过USB转485接入PC
3.测试步骤
发送字符串，一共两条指令
第一条是闭合继电器
第二...
运动软件设计问题 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
本帖最后由 wwwwwwwwwwww 于 2026-07-03 10:55 编辑
我要做一个运动软件，里面有一个轨迹图功能，我应该怎么做出来？需要用什么组件？而且我需要怎么处理运动距离过远的时候缩放和自动保存？
地图相关组件，画线组件，地图本...
Encoding as Base64 in Java
...erInterface is for JAXB provider use only.
– gebirgsbärbel
Dec 3 '13 at 22:45
11
I think that @g...
What is meant with “const” at end of function declaration? [duplicate]
...edited Dec 11 '18 at 17:34
Pat Mächler
39922 silver badges1212 bronze badges
answered Jun 29 '10 at 13:32
Jan...
Why can't a text column have a default value in MySQL?
...w addition from a MySQL developer at MySQL Bugs:
[17 Mar 2017 15:11] Ståle Deraas
Posted by developer:
This is indeed a valid feature request, and at first glance it might seem trivial to add. But TEXT/BLOBS values are not stored directly in the record buffer used for reading/updating...
MySQL “NOT IN” query
...ted Feb 15 '12 at 7:19
Jari Keinänen
1,15911 gold badge2020 silver badges3939 bronze badges
answered Jul 9 '11 at 16:11
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How can I tell if a library was compiled with -g?
...me, using clang compiler in Android with cmake :)
– Pär Nils Amsen
May 26 '17 at 10:56
super great for a fast checkin...
How to specify a min but no max decimal using the range data annotation attribute?
...
@ppumkin Använd ErrorMessage , i.e. [Range(0.0, Double.MaxValue, ErrorMessage = "your error here")]
– flafffl
Oct 10 '13 at 15:07
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Git: list only “untracked” files (also, custom commands)
... It also lists modified files.
– Frank-Rene Schäfer
Nov 2 '18 at 12:22
1
nice, but I get i...
node.js execute system command synchronously
... of child_process. I think, it should be.
– Michael Härtl
Sep 5 '12 at 10:23
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