使用Chrome序列号清除极点显示文本 [英] Clear Pole Display text using chrome serial

问题描述

我创建了一个chrome应用程序，该应用程序通过串行端口连接到Pole Display，我已经成功写入了它，但是每次发送一条消息时，它都将它与上一个连接起来，我找不到方法每次发送新消息时都要清除屏幕！

I have created a chrome application to connect to a Pole Display through serial port, I have succeeded with writing to it, but every time I send a message, it concatenates it with the previous one, I can't find a way to clear the screen each time I send a new message !

这是我的代码:

var connectionId = -1;

openPort("COM3");

function openPort(port){
  var onOpen = function(connectionInfo) {
    if (!connectionInfo || connectionInfo.connectionId == -1) {
      return;
    }
    connectionId = connectionInfo.connectionId;
  }
  chrome.serial.connect(port, {bitrate: 9600}, onOpen);
}

function closePort() {
  if (connectionId == -1) {
    return;
  }

  var onDisconnect = function(connectionInfo) {
    connectionId = -1;
  }
  chrome.serial.disconnect(connectionId, onDisconnect);
}

function sendData(str){
  chrome.serial.flush(connectionId, function(){});
  chrome.serial.send(connectionId, str2ab(str), function(){});
}

function str2ab(str) {
  var buf      = new ArrayBuffer(str.length);
  var bufView  = new Uint8Array(buf);
  for (var i   = 0; i < str.length; i++) {
    bufView[i] = str.charCodeAt(i);
  }
  return buf;
}

sendData("dsadsads");

推荐答案

您应该查看极点显示手册.

You should be looking into your Pole Display manual.

根据我的经验，您需要发送一个特殊命令来清除显示和/或在开始时重新放置插入标记.

From my experience working with one, you need to send a special command to clear the display and / or reposition the caret at the beginning.

您为显示模型命名，然后搜索"BIRCH DSP-800手册"，该链接将首先链接到

You named your display model, and a search for "BIRCH DSP-800 manual" gives first link to this document that contains all the command codes in section 4.1.7.

要覆盖字符串，您只需要发送40个字符即可翻转"旧数据. 顺便说一下，这是一种通用的解决方案:仅以等于显示大小的块形式编写文本.根据需要使用空格填充.

To overwrite a string, you just need to send exactly 40 characters that will "roll over" the old data. This is a universal solution by the way: only write text in chunks equal to display size. Pad with spaces as needed.

您还可以通过发送与命令相对应的字符串来执行命令.让我们以清除范围"命令为例.

You can also execute commands by sending a string of characters corresponding to a command. Let's do it with the example of "clear range" command.

清除范围从1到40的位置并将光标移到1的位置"

"Clear range from 1 position to 40 position and move cursor to 1 position"

十六进制字符串为04 01 43 n m 17，请注意:m和n在[0x31; 0x58]范围内，因此位置1将为n = 0x31，位置40将为(十六进制算术！)m = 0x31 + 39 = 49 + 39 = 88 = 0x58(不足为奇).因此，正确的命令(十六进制编码)是04 01 43 31 58 17.

Hex string is 04 01 43 n m 17, take note: m and n are in range [0x31;0x58], so position 1 would be n = 0x31 and position 40 would be (hex arithmetic!) m = 0x31 + 39 = 49 + 39 = 88 = 0x58 (no surprise). Therefore, the correct command (hex-encoded) is 04 01 43 31 58 17.

对应的字符串为String.fromCharCode(0x04, 0x01, 0x43, 0x31, 0x58, 0x17)，您将其作为文本发送，就可以了.

The corresponding string would be String.fromCharCode(0x04, 0x01, 0x43, 0x31, 0x58, 0x17), you send it as text and you're done.

您可以转换其他类似的命令并完全控制杆的显示.

You can convert other commands like that and control your pole display fully.

这篇关于使用Chrome序列号清除极点显示文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！