发送字节[254]以什么格式发送

Question

我在c＃中有这样的代码，它完美地工作，发送正确的数字到一个继电器打开/关闭继电器。我正尝试使用Arduino程序和微控制器来控制继电器，并努力从继电器中获得任何响应。我正在检查的一个选项是查看该程序以什么格式发送字节（二进制，ascii字符代码，ascii字符等），以试图在其他程序中模拟此操作。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.IO.Ports; 
using System.Threading; 

namespace ConsoleApplication2 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
     Console.WriteLine("hello world"); 
     LightRelayBoard lrb = new LightRelayBoard("COM1"); 
     lrb.WorkspaceLight(4); 
     Thread.Sleep(100); 

     lrb.Query(); 

     Thread.Sleep(5000); 

     lrb.WorkspaceLight(0); 
     Thread.Sleep(100); 

     lrb.Query(); 

     Console.Read(); 
    } 
} 

public class LightRelayBoard 
{ 
    SerialPort sp; 
    byte[] relay1Off = new byte[2]; 
    byte[] relay2Off = new byte[2]; 
    byte[] relay3Off = new byte[2]; 
    byte[] relay4Off = new byte[2]; 
    byte[] relay1On = new byte[2]; 
    byte[] relay2On = new byte[2]; 
    byte[] relay3On = new byte[2]; 
    byte[] relay4On = new byte[2]; 
    byte[] relay1query = new byte[2]; 

    int currentState = 0; 



    public LightRelayBoard(string portName) // constructor 
    { 
     relay1Off[0] = (byte)254; 
     relay1Off[1] = 0; 
     relay2Off[0] = (byte)254; 
     relay2Off[1] = 1; 
     relay3Off[0] = (byte)254; 
     relay3Off[1] = 2; 
     relay4Off[0] = (byte)254; 
     relay4Off[1] = 3; 
     relay1On[0] = (byte)254; 
     relay1On[1] = (byte)8; 
     relay2On[0] = (byte)254; 
     relay2On[1] = (byte)9; 
     relay3On[0] = (byte)254; 
     relay3On[1] = (byte)10; 
     relay4On[0] = (byte)254; 
     relay4On[1] = (byte)11; 
     relay1query[0] = (byte)254; 
     relay1query[1] = (byte)16; 

     sp = new SerialPort(portName, 9600); 

     sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler); 



     try { sp.Open(); } 
     catch 
     { 
      Console.WriteLine("Couldn't open light relay board: port ({0})", portName); 
     } 


     for (int i = 0; i <= 4; i++) 
     { 
      WorkspaceLight(i); 
      Thread.Sleep(100); 
     } 

     for (int i = 3; i >= 0; i--) 
     { 
      WorkspaceLight(i); 
      Thread.Sleep(100); 
     } 


    } 

    public void WorkspaceLight(int command) 
    { 
     if (command > 4) 
      command = 4; 
     else if (command < 0) 
      command = 0; 

     if (command > currentState) 
     { 
      for (int i = (currentState + 1); i <= command; i++) 
      { 
       executeRelay(i, true); //turn on ith relay 
       //Console.WriteLine("{0} on", i); 
      } 
      currentState = command; 
     } 
     else if (command < currentState) 
     { 
      for (int i = currentState; i > command; i--) 
      { 
       executeRelay(i, false); //turn on ith relay// turn off ith relay 
       //Console.WriteLine("{0} off", i); 
      } 

      currentState = command; 
     } 

     return; 
    } 

    public void Query() 
    { 
     if (sp.IsOpen) 
     { 
      try 
      { 
       sp.Write(relay1query, 0, 2); 
      } 
      catch 
      { 
      } 
     } 
    } 

    private void executeRelay(int ch, bool dir) 
    { 
     byte[] send = relay1Off; 

     if (ch == 1 && dir == true) 
      send = relay1On; 
     else if (ch == 1 && dir == false) 
      send = relay1Off; 
     else if (ch == 2 && dir == true) 
      send = relay2On; 
     else if (ch == 2 && dir == false) 
      send = relay2Off; 
     else if (ch == 3 && dir == true) 
      send = relay3On; 
     else if (ch == 3 && dir == false) 
      send = relay3Off; 
     else if (ch == 4 && dir == true) 
      send = relay4On; 
     else if (ch == 4 && dir == false) 
      send = relay4Off; 

     if (sp.IsOpen) 
     { 
      try 
      { 
       sp.Write(send, 0, 2); 
      } 
      catch 
      { 
      } 
     } 

     return; 
    } 

    void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e) 
    { 
     SerialPort sp2 = (SerialPort)sender; 
     int numBytes = sp2.BytesToRead; 
     byte[] sp2buffer = new byte[numBytes]; 
     sp2.Read(sp2buffer, 0, sp2.BytesToRead); 

     Console.WriteLine("DATA from sp: {0}", sp2buffer[0].ToString()); 
    } 
} 

这里是Arduino的代码：

int ledPin = 13; 
    unsigned char a = B11111110; 
    unsigned char b = B00001000; 
    void setup() 
    { 
    pinMode(ledPin, OUTPUT); 
    // serial communication 
    Serial.begin(9600); 
    Serial2.begin(9600); //serial comms with relay board 
    } 
    void loop() 

{ 
if(Serial.available()>0){ //available means it is receiving data 
    Serial2.print(a); 
Serial.println(a); //see what Serial is printing on the screen 
Serial2.print(b); 
Serial.print(b); 
} 
if(Serial2.available()>0){ //check if serial 2 is recieving data 

    Serial.write("data"); 
     } 
    else{ 
     Serial.print("no data"); 
     } 
} 

Answer 1

二进制只是表示数字的方式。 ASCII字符和字符代码将具有整数值作为字节。

你的情况没有“格式”。您正在直接设置单个字节。也许问题是为什么你的其他程序没有产生相同的结果？

Answer 2

A byte可以保存从0到255的无符号值。它除了你认为解释为没有“格式”相关联。