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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...
Instagram how to get my user id from username?
... check if its a valid request is by the cookie submitted in the header. If user_id exist in the cookie proeprty, it'll be considered a valid request. Check out the cookie property on the request header when you navigate to the URL shown
– Kiong
Jul 6 '18 at 15:...
大数据能否拯救中国足球？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...号文”，将体育产业上升为“国家战略”。文件指出，到2025年，中国体育产业总规模将超过5万亿元。而今年4月《中国足球中长期发展规划》的发布不仅意味着2016年将是体育、足球的大年，更意味着中国体育、足球产业将迎来...
Error handling in getJSON calls
...k, Flask's jsonify f and SQLAlchemy)
try:
snip = Snip.query.filter_by(user_id=current_user.get_id(), id=snip_id).first()
db.session.delete(snip)
db.session.commit()
return jsonify(success=True)
except Exception, e:
logging.debug(e)
return jsonify(error="Sorry, we couldn't de...
What does inverse_of do? What SQL does it generate?
...gnment against non existing or invalid entries with validates_presence of :user_id, :role_id, it is useful. You can still generate a User @user with his association @user.role(params[:role_id]) so that saving the user would not result in a failing validation of the Assignment model.
...
How to show particular image as thumbnail while implementing share on Facebook?
... type of page
The URL
The websites name
A description of the page
Facebook user_id's of administrators of the page ( on facebook )
Here is an example ( taken from the facebook documentation ) of some og:tags
<meta property="og:title" content="The Rock"/>
<meta property="og:type" content=...
Approximate cost to access various caches and main memory?
...
Just for a sake of 2020's review of the predictions for 2025:
The last about 44 years of the integrated circuit technology, the classical (non-quantum) processors evolved, literally and physically "Per Aspera ad Astra". The last decade has evidenced, the classical process has got...
Cannot open database “test” requested by the login. The login failed. Login failed for user 'xyz\ASP
... than not set up as a login.
To test if it's set up as a login
SELECT SUSER_ID('xyz\ASPNET') -- (**not** SUSER_SID)
If NULL
CREATE LOGIN [xyz\ASPNET] FROM WINDOWS
If not NULL
USE test
GO
SELECT USER_ID('xyz\ASPNET')
If NULL
USE test
GO
CREATE USER [xyz\ASPNET] FROM LOGIN [xyz\ASPNET]
...
离线版启动超时，有报错日志 - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
...eb]
Picked up JAVA_TOOL_OPTIONS: "-Dfile.encoding=UTF-8"
May 08, 2025 9:40:04 AM com.google.appengine.init.AppEngineWebXmlInitialParse <init>
信息: appengine runtime jars built on 2024-08-10T22:53:40-06:00 from commit dd4268f5f2cfcfe0ba6a84fff2b6c08cfe5ba548, version 2.0.30-SNAPSHO...
诺奖得主谈“双创”：让鼓励创业成为一种文化 - 资讯 - 清泛网 - 专注C/C++...
...精神的专项投资基金，推动互联网+的战略以及中国制造2025年的发展战略，还需要从工业化走向创新化的变革。2014~2015上半年，每天大约有一万家企业进行注册，这是让人难以置信的，而且在未来还有很强的上升趋势。但要实现...