C# 怎么以16进制向串口发送这个字符串

0x63 0x69 0x72 0x20 0x32 0x32 0x0D 0x0A
怎么用C# 以16进制向串口发送这个字符串

byte[] cmd = new byte[] { 0x63 0x69 0x72 0x20 0x32 0x32 0x0D 0x0A };
serialPort.Write(cmd, 0, cmd.Length);

serialPort1 = new SerialPort("COM3", 9600, Parity.None, 8, StopBits.One);
serialPort1.Open();
serialPort1.WriteLine(new string(new char[] { 0x63 0x69 0x72 0x20 0x32 0x32 0x0D 0x0A }));