private bool ReadParams(HVAC hvac)
{
//1.读取保持寄存器的数据,从40000 读到 40046，寄存器数量48
byte[] b1 = objTcpClient.ReadHoldingRegisters(0, 48, 0);
//2.处理数据
if (b1 != null)
{
//遍历modbus地址为4区的param
foreach (Param item in hvac.Params)
{
if (item.ModubsAddr[0] == '4') //4xxxx
{
// 40002 => 002 => 4
int start = int.Parse(item.ModubsAddr.Substring(2, 3)) * 2;
byte[] data = new byte[4] {
b1[start], b1[start + 1], b1[start + 2], b1[start + 3]
};
data = Common.DataConverter.ReverseFormatDCBA(data);
item.Value = BitConverter.ToSingle(data, 0); //startIndex处的字节为高位字节
}
}
}
else
{
return(false);
}
//3.读取输入线圈状态，从00000读到00003，共4个线圈，起始地址为0
byte[] b2 = objTcpClient.ReadCoilStatus(0, 4, 0);
if (b2 != null)
{
foreach (Param item in hvac.Params)
{
if (item.ModubsAddr[0] == '0')
{
//获取该变量的相对地址，相对地址为绝对地址减去读取起始地址
//此处读取起始地址为0，则相对地址即为modbus绝对地址的尾数
int i = int.Parse(item.ModubsAddr.Substring(2, 3));
//将第0个字节转换成2进制形式的字符串 11011010
string str = Convert.ToString(b2[0], 2).PadLeft(8, '0');
char c = str[7 - i];
item.Value = (c == '1' ? 1f : 0f);
}
}
return(true);
}
else
{
return(false);
}
}