23 23 3D 05 设备ID
00 00 39 05 刷卡次数？取水容量mL？
12 09 0C 9D 12-年份后两位 09-月份 0C-日 9D-157 = 01:57 凌晨一点五十七分
8B 9B 3B 6C
8E 5D 00 00 金额 单位 厘
00 00 00 00 
00 00 00 00 
30 00 77 08

确定内容中不存在简单的xor校验，已经用程序遍历了所有可能性

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 校验测试
{
    class Program
    {
        static void Main(string[] args)
        {
            var data = new byte[]{0x23,0x23,0x3D,0x05,0x00,0x00,0x39,0x05,0x12,0x09,0x0C,0x9D,0x8B,0x9B,0x3B,0x6C,0x8E,0x5D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,0x77,0x08};
            var data2 = new byte[]{0x23,0x23,0x3D,0x05,0x00,0x00,0x3A,0x05,0x12,0x09,0x0C,0x9D,0x8B,0x9B,0x3B,0x99,0x70,0x5D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x31,0x00,0x78,0xF1};
            var data3 = new byte[]{0x23,0x23,0x3D,0x05,0x00,0x00,0x3B,0x05,0x12,0x09,0x0C,0x9D,0x8B,0x9B,0x3B,0x3D,0x52,0x5D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x32,0x00,0x79,0xDB};
            var data4 = new byte[]{0x23,0x23,0x3D,0x05,0x00,0x00,0x3C,0x05,0x12,0x09,0x0C,0x9D,0x8B,0x9B,0x3B,0x6A,0x34,0x5D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x00,0x7A,0x3B};
            var data5 = new byte[]{0x23,0x23,0x3D,0x05,0x00,0x00,0x3D,0x05,0x12,0x09,0x0C,0x9D,0x8B,0x9B,0x3B,0xCE,0x16,0x5D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x34,0x00,0x7B,0x8F};
            var data6 = new byte[]{0x23,0x23,0x3D,0x05,0x00,0x00,0x3E,0x05,0x12,0x09,0x0C,0x9D,0x8B,0x9B,0x3B,0x3B,0xF8,0x5C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x35,0x00,0x7C,0x50};
            var list = new List<byte[]>();

            list.Add(data);
            list.Add(data2);
            list.Add(data3);
            list.Add(data4);
            list.Add(data5);
            list.Add(data6);

            //校验位遍历
            for(var i = 0;i < list[0].Count();i++)
            {
                //起点
                for(var j = 0;j < list[0].Count();j++)
                {
                    if(i != j)
                    {
                        byte r = 0;

                        for(var k = j;k < list[0].Count();k++)
                        {
                            if(i != k)
                            {
                                r ^= list[0][k];

                                //若校验成功
                                if(r == list[0][i])
                                {
                                    //检查其它数据

                                    byte rt = 0;
                                    bool flag = true;

                                    //遍历数据列表
                                    for(var m = 1;m < list.Count();m++)
                                    {
                                        //遍历待校验字节
                                        for(var p = j;p <= k;p++)
                                        {
                                            if(p != i)
                                            {
                                                rt ^= list[m][p];
                                            }
                                        }

                                        if(rt != list[m][i])
                                        {
                                            flag = false;
                                            break;
                                        }
                                    }

                                    //多次校验成功
                                    if(flag && (k > j))
                                    {
                                        Console.WriteLine("发现一处校验位：" + i + "，校验区域：" + j + " - " + k);
                                    }
                                }
                            }
                        }
                    }
                }
            }

            Console.ReadLine();
        }
    }
}

lizhirui 23 23 3D 05 设备ID 00 00 39 05 刷卡次数？取水容量mL？ 12 09 0C 9D 12-年份后两位 09-月份 0C-日 9D-157 = 01:57 凌晨一点五十七分 ...

那应该是更深层次的了

回贴是一种美德

算出来了么