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FLOWSERVE UKC-5125-5X4A轴承伺服控制器
使用QTERM-II有三种方法可以“自定义”应用程序的QTERM-II操作：•开机设置要设置显示对比度、波特率和数据格式，请参阅本章开头部分。•软件命令如果要将命令从主机发送到QTERM-II，请参阅第2章，以获取所有命令的列表以及如何使用这些命令的详细信息。其中一些命令允许您控制显示器（如光标移动、清晰屏幕和换行），其他命令控制硬件的操作（如LED控制和按键控制），以及其他命令控制外部设备（条形码控制和数字输出控制）。•QDATA文件下载可以使用软件命令控制QTERM-II的所有可配置参数，也可以在QDATA中设置适当的值并将其下载到QTERM-II中。修改密钥字符串（即按下密钥时QTERM-II传输的内容）或修改八个自定义字符的唯一方法是修改和下载QDATA文件。第3章介绍了如何修改此文件以及如何将其加载到QTERM-II中。还有几个例子利用了键字符串的强大功能。QTERM-II的操作非常简单：•QTERM-II通电。•命令或数据可以传输到QTERM-II。根据需要执行命令；显示数据。•当按下某个键时，QTERM-II会将相应的字符传输到主机。QTERM-II具有许多附加功能，可通过三种方式访问：•开机设置（参见第1章）•主机软件命令（本章）•配置文件下载（参见第3章）2.1.1握手QTERM-II具有接收和发送字符的缓冲区。然而，对于某些应用程序来说，这些缓冲区可能不够大。如果您的应用程序就是这种情况，那么您的主机必须使用XON/XOFF握手来优化QTERM-II的功能。
QTERM-II的传输缓冲区（16字节长）
当主机在一段时间内不希望接收字符时使用。主机向QTERM-II发送一个XOFF字符。QTERM-II开始将键盘代码（每次击键一个字符，无论分配给该键的字符串中有多少个字符）放入传输缓冲区，而不是传输它们。当主机准备好接收字符时，它发送一个XON字符，此时QTERM-II将开始在缓冲区中传输字符。QTERM-II的接收缓冲区足够大，可以以最大波特率（9600）接受全屏文本，而不会超出缓冲区。但是，有些操作可能需要更长的时间才能执行，例如将整个屏幕向下滚动一行。在这种情况下，当QTERM-II的缓冲区中只有六个字节为空时，它将向主机发送一个XOFF。当它处理输入数据到缓冲区只使用了六个字节时，它将发送一个XON，主机可以继续传输。附录C中的命令摘要显示了QTERM-II各种操作的大致执行时间。如果您不想使用XON/XOFF握手，也可以禁用它（通过软件命令或QDATA文件）。但是，如果不使用握手，则必须格外小心，不要溢出QTERM-II的接收缓冲区。最简单的两种方法是使用较慢的波特率（这给QTERM-II更多的时间来处理每个字节），或者在每次写入QTERM-II后为代码添加延迟。2.1.2命令与QDATA参数有许多参数由QDATA配置文件设置（见第3章），但可以由软件命令覆盖。例如，制表符间距在QDATA文件中设置，但可以通过“设置制表符间隔”命令进行更改。
Using the QTERM-II
There are three ways to "customize" the operation of the QTERM-II for your application: •Power-On Setup To set the display contrast, baud rate and data format, see the beginning of this chapter. • Software Commands If you want to send commands from your host computer to the QTERM-II, see Chapter 2 for a list of all commands and details on how to use them. Some of the commands allow you to control the display (such as cursor movement, clear screen and line feed), others control operation of the hardware (such as LED control and key click control), and others control external devices (bar code control and digital output control). •QDATA File Download All configurable parameters of the QTERM-II can be controlled using software commands or by setting the proper values in the QDATA file and downloading it into the QTERM-II. The only way to modify the key strings (i.e. what the QTERM-II transmits when a key is pressed), or to modify the eight custom characters, is by modifying and downloading the QDATA file. Chapter 3 shows how to modify this file and how to load it into your QTERM-II. There are also several examples that utilize the powerful capabilities of key strings.The operation of the QTERM-II is quite simple: • Power is applied to the QTERM-II. •Commands or data can be transmitted to the QTERM-II. Commands are executed as required; data is displayed. •When a key is pressed, the QTERM-II transmits the appropriate character(s) to the host. The QTERM-II has many additional capabilities which are accessed in three ways: • Power-On Setup (see Chapter 1) • Software commands from host (this chapter) •Configuration-file download (see Chapter 3) 2.1.1 Handshaking The QTERM-II has buffers for both receiving and transmitting characters. However, these buffers may not be large enough for some applications. If this is the case for your application, then your host must use XON/XOFF handshaking to make optimal use of the QTERM-II's capabilities.
The QTERM-II's transmit buffer (16 bytes long)
is used when a host does not wish to receive characters for a period of time. The host sends an XOFF character to the QTERM-II. The QTERM-II starts placing keycodes (one character per keystroke, regardless of how many characters are in the string assigned to the key) into the transmit buffer rather than transmitting them. When the host is ready to receive characters, it sends an XON character, at which time the QTERM-II will start transmitting the characters in the buffer. The QTERM-II's receive buffer is large enough to accept a full screen of text at the maximum baud rate (9600) without overrunning the buffer. However, some operations can take a longer time to execute, such as scrolling the entire screen down one line. In this case, the QTERM-II will send an XOFF to the host when it has only six bytes empty in its buffer. When it has processed input data to the point that the buffer only has six bytes used, it will send an XON, and the host can resume transmitting. The command summary in Appendix C shows approximate execution time for each of the various operations of the QTERM-II. XON/XOFF handshaking can also be disabled (by software command or the QDATA file) if you do not wish to use it. However, if you do not use handshaking, you must take extra care that you do not overrun the QTERM-II's receive buffer. The two easiest ways to do this are to use a slower baud rate (which gives the QTERM-II more time to process each byte) or add delays to your code after each write to the QTERM-II. 2.1.2 Commands vs QDATA Parameters There are numerous parameters which are set by the QDATA configuration file (see Chapter 3) but which can be overridden by a software command. For example, tab spacing is set in the QDATA file, but can be changed by the Set Tab Spacing command.
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