private void button20_Click(object sender, EventArgs e)//福建：点对点校时
{
if (textBox21.Text.Length != 12)
{
MessageBox.Show("数据不足，请重新输入！");
return;
}
Protocol645 p645 = new Protocol645();
p645.FujianDianDuiDianSetTime(textBox21.Text);
}