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Modbus硬件控制02——modbus继电器 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...置均通过485通信口进行设置，且可通过产品上的按键进行重置为默认设置，即为9600波特率，8个数据位，偶校验，1个停止位。
二、模块功能
本模块具备一路数字输入和一路数字输出，还具备一个标准的 RS-485 通讯接口，通信...
【解决】Error 701: Unable to load xxx.xxx - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...Unable to load xxx.xxx
比如：
【解决】：连接菜单 -> 重置连接。然后再重新连接一次AI伴侣进行测试，就能解决。
【原理】：在AI伴侣已经连接好之后，访问才刚上传的某资源，就会报这个错误。因为资源不会自动同步到AI...
授权页面加载不出来？ - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
授权页面加载不出来，空白：
经过远程查看，ctrl + f12，保存原因是通过浏览器代理导致访问失败。
重置 host 解决，网络通了就 ok 了。可以借助 ai 辅助调查代理保存原因及解决方法。
Making heatmap from pandas DataFrame
...sinstance(index, pd.DatetimeIndex):
idx = pd.DatetimeIndex(middle).union([start,end])
elif isinstance(index, (pd.Float64Index,pd.RangeIndex,pd.Int64Index)):
idx = pd.Float64Index(middle).union([start,end])
else:
print('Warning: guessing what to do with index type %s' ...
Detecting endianness programmatically in a C++ program
...punning - it will often be warned against by compiler. That's exactly what unions are for !
bool is_big_endian(void)
{
union {
uint32_t i;
char c[4];
} bint = {0x01020304};
return bint.c[0] == 1;
}
The principle is equivalent to the type case as suggested by others, ...
记录一些Mac OS X技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的用户即可。
访问时使用本机的ip，端口为22，用户名和密码为该用户的Mac OS X的登录密码。
关闭鼠标加速度
Mac OS X的鼠标加速度很诡异，缓慢移动鼠标时几乎很难移动。
下载Mouse Acceleration Preference Pane这个配置文件，安装后...
Why use the SQL Server 2008 geography data type?
...dbo.Geo
SELECT geography::Point(12.3456789012345, 12.3456789012345, 4326)
UNION ALL
SELECT geography::Point(87.6543210987654, 87.6543210987654, 4326)
GO 10000
INSERT dbo.LatLng
SELECT 12.3456789012345, 12.3456789012345
UNION
SELECT 87.6543210987654, 87.6543210987654
GO 10000
EXEC sp_spaceuse...
How to report an error from a SQL Server user-defined function
...rom foo where ID = @aID
--error checking code is embedded within this union
--when the ID exists, this second selection is empty due to where clause at end
--when ID doesn't exist, invalid cast with case statement conditionally causes an error
--case statement is very hack-y, but th...
phpmyadmin logs out after 1440 secs
In my local development Ubuntu box I use MySQL and phpmyadmin to work with the database.
24 Answers
...
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
Error message on MySql:
7 Answers
7
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