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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！
...路为核心的经济型MODBUS-485继电器模块,实现了标准MODBUS-485通信功能。它可以与9V，12V或24V电压配合使用。本模块支持所有常见波特率、停止位和校验位的组合，并可任意设置MODBUS地址。这些配置均通过485通信口进行设置，且可通...
淘宝应对双\"11\"的技术架构分析 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...例子莫过于各个分层之间使用短连接模式的HTTP协议进行通信。这样的策略直接导致在流量高峰期单机的TCP连接数非常高。所以说，一个良好的架构固然能够在很大程度上降低开发和维护的成本，但它自身一定是随着数据量和流...
Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
...d1 && cmd2
[ a = a -a b = b ]: equivalent, but deprecated by POSIX³
[ a = a ] && [ b = b ]: POSIX and reliable equivalent
(
[[ (a = a || a = b) && a = b ]]: false
[ ( a = a ) ]: syntax error, () is interpreted as a subshell
[ \( a = a -o a = b \) -a a = b ]: equivalent, ...
App Inventor 2 AI伴侣有电脑版的吗? - App Inventor 2 中文网 - 清泛网 - 专注C/C++及内核技术
...，无法摇动它、无法拨打或接听电话等，也无法模拟蓝牙通信（需要测试SPP/BLE蓝牙通信的请使用安卓真机）。
Q：AI伴侣扫码测试时手机和电脑必须在同一局域网内吗？
A：旧的兼容模式的测试原理是电脑端启动Web服务供手机...
App Inventor 2 连接方式：AI伴侣、模拟器、USB · App Inventor 2 中文网
...，无法摇动它、无法拨打或接听电话等，也无法模拟蓝牙通信（需要测试SPP/BLE蓝牙通信的请使用安卓真机）。
Q：AI伴侣扫码测试时手机和电脑必须在同一局域网内吗？
A：旧的兼容模式的测试原理是电脑端启动Web服务供手机...
Coding in Other (Spoken) Languages
...h names, there's a similar dilemma about whether to use special chars (äöå) or replace them with a & o (and if you do use them, you're likely running into charset problems). But yeah, fortunately I haven't had to use Finnish in code for at least 7 years. :)
– Jonik
...
Extract subset of key-value pairs from Python dictionary object?
...works in 2.7 too):
{k: bigdict[k] for k in ('l', 'm', 'n')}
Update: As Håvard S points out, I'm assuming that you know the keys are going to be in the dictionary - see his answer if you aren't able to make that assumption. Alternatively, as timbo points out in the comments, if you want a key tha...
Does PostgreSQL support “accent insensitive” collations?
... unaccent() always substitutes a single letter:
SELECT unaccent('Œ Æ œ æ ß');
unaccent
----------
E A e a S
You will love this update to unaccent in Postgres 9.6:
Extend contrib/unaccent's standard unaccent.rules file to handle all
diacritics known to Unicode, and expand ligatures cor...
Compression/Decompression string with C#
...ut only for UTF8-based things. If you add in, say, Swedish characters like åäö to the string value you're serialize/deserializing it will fail a round-trip test :/
– bc3tech
Aug 21 '19 at 12:32
...
Filling a DataSet or DataTable from a LINQ query result set
...wered Aug 15 '08 at 16:42
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