NIOS-based keyboard scan code. Be achieved with the query in this case!
说明：基于NIOS的键盘扫描代码。本例用查询方式实现！
CTBUG supplies a lot of very useful subroutines which may be called by users, including Keyboard Scan, Keyboard Input Wait, Display Update and Data Display subroutines and so on.
CTBUG提供了许多很有用的子程序供用户调用，其中包括有键盘扫描、键盘输入等待，显示更新，数据显示等子程序。
Internally, a common process of every XIM is to translate keyboard scan code into keycode and then to keysym, by calling XKB, whose process detail has been described in previous sections.
在内部，各种XIM的共同机理是把调用XKB通过上面叙述的过程把键盘扫描码转换成击键代码和键盘符号。
A human reader would scan this receipt, decide on the data it contains, then enter the transaction via the keyboard.
人可以阅读此收据，决定它包含的数据，然后通过键盘输入这次交易。
Assigned to each key on a keyboard is a unique value called a scan code, a device-dependent identifier for the key on the keyboard.
中文翻译：键盘上的键都分配有一个独一无二的扫描码，即和设备相关的标识符。
A keyboard generates two scan codes when the user types a key-one when the user presses the key and another when the user releases the key.
当用户按键时候会产生两个扫描码——一个是按下的时候产生的，另外一个是当用户手释放的时候产生的。
By contrast, PC keyboards are not only cheap, stable and reliable but also a kind of coded keyboard which can be scanned and send the scan code via a standard 5 core socket automatically.
PC用键盘则恰恰相反，不但价格便宜，稳定可靠，而且是编码键盘，可自动扫描键盘并通过键盘用标准5芯插口发送按键的扫描码。
This system has high economy because of using itinerant monitor to analogy signals that made by PLC modules, using LED display and scan keyboard as press buttons that made by PLC dynamic I/O modules.
用PLC模块构成多路模拟量巡检，用动态I/O模块实现LED显示及扫描键盘按钮，使系统具有较高的经济性。
This system has high economy because of using itinerant monitor to analogy signals that made by PLC modules, using LED display and scan keyboard as press buttons that made by PLC dynamic I/O modules.
用PLC模块构成多路模拟量巡检，用动态I/O模块实现LED显示及扫描键盘按钮，使系统具有较高的经济性。
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