public static bool checkBuf(byte[] bb)
{
ModbusCRC16 crc16 = new ModbusCRC16();
crc16.update(bb, bb.Length - 2);
int ri = crc16.getValue();
if (bb[bb.Length - 1] == (byte)(ri & 0xff) &&
bb[bb.Length - 2] == (byte)((0xff00 & ri) >> 8))
{
return(true);
}
return(false);
}
//将16进制的字符串转换为带有CRC校验的字节型数组的方法
public static byte[] getSendBuf(String toSend)
{
toSend = toSend.Replace(" ", "");
byte[] bb = HexString2Buf(toSend);
ModbusCRC16 crc16 = new ModbusCRC16();
crc16.update(bb, bb.Length - 2);
int ri = crc16.getValue();
bb[bb.Length - 1] = (byte)(0xff & ri);
bb[bb.Length - 2] = (byte)((0xff00 & ri) >> 8);
return(bb);
}
private void btnSendCRC_Click(object sender, EventArgs e)
{
//发送前判断串口是否打开
if (!serialPort.IsOpen)
{
MessageBox.Show("请先打开串口！", "提示信息",
MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
//判断cbTimeSend是否被勾选，来决定是否启动Timer控件进行定时发送
if (cbTimeSend.Checked)
{
timeSend.Enabled = true;
}
else
{
timeSend.Enabled = false;
}
if (rbSend16.Checked == true)
{
try
{
//如果以16进制带CRC校验形式发送，调用ModbusCRC16的方法将16进制字符串转换为带CRC的字节数组
byte[] byteBuffer = ModbusCRC16.getSendBuf(txtSend.Text);
serialPort.Write(byteBuffer, 0, byteBuffer.Length);
SendMessage(ByteToHex(byteBuffer));
}
catch (Exception ex)
{
MessageBox.Show("16进制数的格式或长度不正确，请检查格式后重新发送。\n" + ex.Message, "信息提示",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
else
{
MessageBox.Show("请选择数据发送的格式！", "信息提示",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}