如何向外部设备发送数据

发布于 2024-09-14 07:50:29 字数 1099 浏览 2 评论 0原文

我有一个串行设备通过 com 端口连接到我的计算机。我想将十六进制数据发送到该设备，向该设备发送数据的最佳方法是什么。

例如，我有这个数据 -

String hexStr = "02303033434333d3037313131303131323639393130333131303139033f";

我现在正在做的是 -

     byte[] unsignedByte = HexUtil.convertToBytes(hexStr);
serialPort.getOutputStream().write(unsignedByte);

我面临的问题是 - 串行设备没有响应？当我通过软件发送相同的十六进制字符串时，终端正在响应。我做错了什么吗？

这是代码的一部分 -

                    mOutputToPort.write(unsignedByte);          
        logger.info("Byte Sent");
        mOutputToPort.flush();
        logger.info("Waiting for response");
        Thread.sleep(10000);
        byte mBytesIn [] = new byte[2000];          
        int num = mInputFromPort.read(mBytesIn);
        System.out.println("Number of bytes read -"+ num);

        for(byte b : mBytesIn){
            System.out.print(b);
            System.out.print(" ");
        }
        System.out.println();

大家好，我终于自己找到了如何正确执行的方法。我没有以正确的格式发送数据。我在使用其他软件监控串行数据交换时发现了这一点。

将数据发送到串行设备的最佳方式是 - ASCII 数据 -->十六进制字符串 -->无符号字节

原文

I have a serial device connected to my computer at com port. I want to send Hex data to this device, what is the best approach to send data to the device.

For example I have this data-

String hexStr = "02303033434333d3037313131303131323639393130333131303139033f";

What I am doing right now is-

     byte[] unsignedByte = HexUtil.convertToBytes(hexStr);
serialPort.getOutputStream().write(unsignedByte);

The problem I am facing is - Serial device is not responding ?
When i m sending the same hex string via a software, terminal is responding. Am I doing something wrong?

This is some part of the code-

                    mOutputToPort.write(unsignedByte);          
        logger.info("Byte Sent");
        mOutputToPort.flush();
        logger.info("Waiting for response");
        Thread.sleep(10000);
        byte mBytesIn [] = new byte[2000];          
        int num = mInputFromPort.read(mBytesIn);
        System.out.println("Number of bytes read -"+ num);

        for(byte b : mBytesIn){
            System.out.print(b);
            System.out.print(" ");
        }
        System.out.println();

Hi Guys, I finally found out by myself how to do it properly.
I was not sending data in correct format. I found out while i monitor the serial data exchange using other software.

the best way to send data to serial device is -
ASCII DATA --> HEX STRING --> UNSIGNED BYTE

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冷︶言冷语的世界 2024-09-21 07:50:29

您可能希望在写入操作后flush()输出流。尝试一下是否有帮助：

byte[] unsignedByte = HexUtil.convertToBytes(hexStr);
serialPort.getOutputStream().write(unsignedByte);
serialPort.getOutputStream().flush();   // <- new line added here

You may want to flush() the outputstream after write operations. Try if this helps:

byte[] unsignedByte = HexUtil.convertToBytes(hexStr);
serialPort.getOutputStream().write(unsignedByte);
serialPort.getOutputStream().flush();   // <- new line added here

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