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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...
...RC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
第二条是断开继电器
mqtt协议一般最大支持订阅几个主题？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...他相关状态。超过限制可能导致客户端崩溃或订阅失败。PC/服务器端客户端： 这类客户端资源充足，通常可以轻松处理成千上万个订阅，其限制主要来自于与之连接的Broker端。
3. 系统资源无论Broker还是Client，订阅主题都会消耗...
Service Temporarily Unavailable Magento?
My application was working fine yesterday. I started my PC today. When I tried to start Magento I got this error message.
1...
Why is require_once so bad to use?
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The other downside is APC doesn't cache include_once and require_once calls IIRC
– dcousineau
Oct 10 '08 at 7:20
3
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Android SDK location
...e Android SDK Location. I have previously had Xamarin Studio working on my pc, and for some reason, I need to enter this again.
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How to get the current date without the time?
...wered Oct 25 '13 at 16:07
Moory PcMoory Pc
7641212 silver badges1111 bronze badges
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Learning assembly [closed]
... You don't understand assembly. You need to understand it. An opcode is a number. Debuggers will attempt to resolve opcodes to their instructions (sometimes its hard). You need to understand the basic instructions. Learning MASM will help you do this. No more needs to be said.
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“VT-x is not available” when i start my Virtual machine [closed]
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VT-x can normally be disabled/enabled in your BIOS.
When your PC is just starting up you should press DEL (or something) to get to the BIOS settings. There you'll find an option to enable VT-technology (or something).
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What exactly is a C pointer if not a memory address?
... 1 = 1? (little-endian) or 65536 = 1? (big-endian). But on my 64-bit Linux PC with GCC 4.4:
$ c99 -O2 -Wall a.c && ./a.out
a.c: In function ‘main’:
a.c:6: warning: dereferencing pointer ‘p’ does break strict-aliasing rules
a.c:5: note: initialized from here
0 = 1?
GCC is kind eno...
How to install the Raspberry Pi cross compiler on my Linux host machine?
...ian-linux/.b
uild/src/gcc-linaro-4.7-2012.08/configure --build=i686-build_pc-linux-gnu --host=i686-build_pc-
linux-gnu --target=arm-linux-gnueabihf --prefix=/cbuild/slaves/oort61/crosstool-ng/builds/arm-l
inux-gnueabihf-raspbian-linux/install --with-sysroot=/cbuild/slaves/oort61/crosstool-ng/buil...