c# - 计算实验室信息系统 (LIS) 帧的校验和

Question

我正在为 Laboratory Information System 开发仪器驱动程序.我想知道如何计算帧的校验和。

校验和算法的解释:

1. Expressed by characters [0-9] and [A-F].

2. Characters beginning from the character after [STX] and until [ETB] or [ETX] (including [ETB] or [ETX]) are added in binary.

3. The 2-digit numbers, which represent the least significant 8 bits in hexadecimal code, are converted to ASCII characters [0-9] and [A-F].

4. The most significant digit is stored in CHK1 and the least significant digit in CHK2.

我没有得到上面的第 3 点和第 4 点。

这是一个示例框架:

<STX>2Q|1|2^1||||20011001153000<CR><ETX><CHK1><CHK2><CR><LF>

CHK1 和CHK2 的值是多少？如何在 C# 中实现给定的算法？

Answer 1

终于得到答案，这里是计算校验和的代码:

private string CalculateChecksum(string dataToCalculate)
{
    byte[] byteToCalculate = Encoding.ASCII.GetBytes(dataToCalculate);
    int checksum = 0;
    foreach (byte chData in byteToCalculate)
    {
        checksum += chData;
    }
    checksum &= 0xff;
    return checksum.ToString("X2");
}