/// <summary>
/// 启动二维位置比较
/// </summary>
/// <param name="nCardNum"></param>
/// <param name="chn">通道号 0：HSIO1 ; 通道号 1: HSIO2</param>
/// <returns></returns>
public override short D2DCompareStart(short nCardNum, short chn)
{
short nRtn = 0;
nRtn |= CMc.GT_2DCompareStart(nCardNum, chn);
return(nRtn);
}