找出 RS232 数据的 CRC 或 CHECKSUM [英] Find out CRC or CHECKSUM of RS232 data

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本文介绍了找出 RS232 数据的 CRC 或 CHECKSUM的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要与 RS232 设备通信，我没有可用的规格或信息.

I need to communicate with a RS232 device, I have no specs or information available.

我发送一个 16 字节的命令并返回一个 16 字节的结果.最后一个字节看起来像某种 crc 或校验和，我试过使用这个 http://miscel.dk/MiscEl/miscelCRCandChecksum.html 没有运气.

I send a 16 byte command and get a 16 byte result back. The last byte looks like some kind of crc or checksum, I have tried using this http://miscel.dk/MiscEl/miscelCRCandChecksum.html with no luck.

任何人都可以对 crc/校验和算法进行逆向工程吗?这是使用 RS-232 监控程序捕获的一些数据:

Anyone can reverse engineer the crc/checksum algorithm? here is some data captured with an RS-232 monitor program:

01 80 42 00 00 00 00 00 00 00 00 00 00 00 01 B3
01 80 42 00 00 00 00 00 00 00 00 00 00 00 02 51
01 80 42 00 00 00 00 00 00 00 00 00 00 00 03 0F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 04 8C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 05 D2
01 80 42 00 00 00 00 00 00 00 00 00 00 00 06 30
01 80 42 00 00 00 00 00 00 00 00 00 00 00 07 6E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 08 2F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 09 71
01 80 42 00 00 00 00 00 00 00 00 00 00 00 0A 93
01 80 42 00 00 00 00 00 00 00 00 00 00 00 0B CD
01 80 42 00 00 00 00 00 00 00 00 00 00 00 0C 4E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 0D 10
01 80 42 00 00 00 00 00 00 00 00 00 00 00 0E F2
01 80 42 00 00 00 00 00 00 00 00 00 00 00 0F AC
01 80 42 00 00 00 00 00 00 00 00 00 00 00 10 70
01 80 42 00 00 00 00 00 00 00 00 00 00 00 11 2E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 12 CC
01 80 42 00 00 00 00 00 00 00 00 00 00 00 13 92
01 80 42 00 00 00 00 00 00 00 00 00 00 00 14 11
01 80 42 00 00 00 00 00 00 00 00 00 00 00 15 4F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 16 AD
01 80 42 00 00 00 00 00 00 00 00 00 00 00 17 F3
01 80 42 00 00 00 00 00 00 00 00 00 00 00 18 B2
01 80 42 00 00 00 00 00 00 00 00 00 00 00 19 EC
01 80 42 00 00 00 00 00 00 00 00 00 00 00 1A 0E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 1B 50
01 80 42 00 00 00 00 00 00 00 00 00 00 00 1C D3
01 80 42 00 00 00 00 00 00 00 00 00 00 00 1D 8D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 1E 6F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 1F 31
01 80 42 00 00 00 00 00 00 00 00 00 00 00 20 CE
01 80 42 00 00 00 00 00 00 00 00 00 00 00 21 90
01 80 42 00 00 00 00 00 00 00 00 00 00 00 22 72
01 80 42 00 00 00 00 00 00 00 00 00 00 00 23 2C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 24 AF
01 80 42 00 00 00 00 00 00 00 00 00 00 00 25 F1
01 80 42 00 00 00 00 00 00 00 00 00 00 00 26 13
01 80 42 00 00 00 00 00 00 00 00 00 00 00 27 4D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 28 0C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 29 52
01 80 42 00 00 00 00 00 00 00 00 00 00 00 2A B0
01 80 42 00 00 00 00 00 00 00 00 00 00 00 2B EE
01 80 42 00 00 00 00 00 00 00 00 00 00 00 2C 6D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 2D 33
01 80 42 00 00 00 00 00 00 00 00 00 00 00 2E D1
01 80 42 00 00 00 00 00 00 00 00 00 00 00 2F 8F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 30 53
01 80 42 00 00 00 00 00 00 00 00 00 00 00 31 0D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 32 EF
01 80 42 00 00 00 00 00 00 00 00 00 00 00 33 B1
01 80 42 00 00 00 00 00 00 00 00 00 00 00 34 32
01 80 42 00 00 00 00 00 00 00 00 00 00 00 35 6C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 36 8E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 37 D0
01 80 42 00 00 00 00 00 00 00 00 00 00 00 38 91
01 80 42 00 00 00 00 00 00 00 00 00 00 00 39 CF
01 80 42 00 00 00 00 00 00 00 00 00 00 00 3A 2D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 3B 73
01 80 42 00 00 00 00 00 00 00 00 00 00 00 3C F0
01 80 42 00 00 00 00 00 00 00 00 00 00 00 3D AE
01 80 42 00 00 00 00 00 00 00 00 00 00 00 3E 4C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 3F 12
01 80 42 00 00 00 00 00 00 00 00 00 00 00 40 AB
01 80 42 00 00 00 00 00 00 00 00 00 00 00 41 F5
01 80 42 00 00 00 00 00 00 00 00 00 00 00 42 17
01 80 42 00 00 00 00 00 00 00 00 00 00 00 43 49
01 80 42 00 00 00 00 00 00 00 00 00 00 00 44 CA
01 80 42 00 00 00 00 00 00 00 00 00 00 00 45 94
01 80 42 00 00 00 00 00 00 00 00 00 00 00 46 76
01 80 42 00 00 00 00 00 00 00 00 00 00 00 47 28
01 80 42 00 00 00 00 00 00 00 00 00 00 00 48 69
01 80 42 00 00 00 00 00 00 00 00 00 00 00 49 37
01 80 42 00 00 00 00 00 00 00 00 00 00 00 4A D5
01 80 42 00 00 00 00 00 00 00 00 00 00 00 4B 8B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 4C 08
01 80 42 00 00 00 00 00 00 00 00 00 00 00 4D 56
01 80 42 00 00 00 00 00 00 00 00 00 00 00 4E B4
01 80 42 00 00 00 00 00 00 00 00 00 00 00 4F EA
01 80 42 00 00 00 00 00 00 00 00 00 00 00 50 36
01 80 42 00 00 00 00 00 00 00 00 00 00 00 51 68
01 80 42 00 00 00 00 00 00 00 00 00 00 00 52 8A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 53 D4
01 80 42 00 00 00 00 00 00 00 00 00 00 00 54 57
01 80 42 00 00 00 00 00 00 00 00 00 00 00 55 09
01 80 42 00 00 00 00 00 00 00 00 00 00 00 56 EB
01 80 42 00 00 00 00 00 00 00 00 00 00 00 57 B5
01 80 42 00 00 00 00 00 00 00 00 00 00 00 58 F4
01 80 42 00 00 00 00 00 00 00 00 00 00 00 59 AA
01 80 42 00 00 00 00 00 00 00 00 00 00 00 5A 48
01 80 42 00 00 00 00 00 00 00 00 00 00 00 5B 16
01 80 42 00 00 00 00 00 00 00 00 00 00 00 5C 95
01 80 42 00 00 00 00 00 00 00 00 00 00 00 5D CB
01 80 42 00 00 00 00 00 00 00 00 00 00 00 5E 29
01 80 42 00 00 00 00 00 00 00 00 00 00 00 5F 77
01 80 42 00 00 00 00 00 00 00 00 00 00 00 60 88
01 80 42 00 00 00 00 00 00 00 00 00 00 00 61 D6
01 80 42 00 00 00 00 00 00 00 00 00 00 00 62 34
01 80 42 00 00 00 00 00 00 00 00 00 00 00 63 6A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 64 E9
01 80 42 00 00 00 00 00 00 00 00 00 00 00 65 B7
01 80 42 00 00 00 00 00 00 00 00 00 00 00 66 55
01 80 42 00 00 00 00 00 00 00 00 00 00 00 67 0B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 68 4A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 69 14
01 80 42 00 00 00 00 00 00 00 00 00 00 00 6A F6
01 80 42 00 00 00 00 00 00 00 00 00 00 00 6B A8
01 80 42 00 00 00 00 00 00 00 00 00 00 00 6C 2B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 6D 75
01 80 42 00 00 00 00 00 00 00 00 00 00 00 6E 97
01 80 42 00 00 00 00 00 00 00 00 00 00 00 6F C9
01 80 42 00 00 00 00 00 00 00 00 00 00 00 70 15
01 80 42 00 00 00 00 00 00 00 00 00 00 00 71 4B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 72 A9
01 80 42 00 00 00 00 00 00 00 00 00 00 00 73 F7
01 80 42 00 00 00 00 00 00 00 00 00 00 00 74 74
01 80 42 00 00 00 00 00 00 00 00 00 00 00 75 2A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 76 C8
01 80 42 00 00 00 00 00 00 00 00 00 00 00 77 96
01 80 42 00 00 00 00 00 00 00 00 00 00 00 78 D7
01 80 42 00 00 00 00 00 00 00 00 00 00 00 79 89
01 80 42 00 00 00 00 00 00 00 00 00 00 00 7A 6B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 7B 35
01 80 42 00 00 00 00 00 00 00 00 00 00 00 7C B6
01 80 42 00 00 00 00 00 00 00 00 00 00 00 7D E8
01 80 42 00 00 00 00 00 00 00 00 00 00 00 7E 0A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 7F 54
01 80 42 00 00 00 00 00 00 00 00 00 00 00 80 61
01 80 42 00 00 00 00 00 00 00 00 00 00 00 81 3F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 82 DD
01 80 42 00 00 00 00 00 00 00 00 00 00 00 83 83
01 80 42 00 00 00 00 00 00 00 00 00 00 00 84 00
01 80 42 00 00 00 00 00 00 00 00 00 00 00 85 5E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 86 BC
01 80 42 00 00 00 00 00 00 00 00 00 00 00 87 E2
01 80 42 00 00 00 00 00 00 00 00 00 00 00 88 A3
01 80 42 00 00 00 00 00 00 00 00 00 00 00 89 FD
01 80 42 00 00 00 00 00 00 00 00 00 00 00 8A 1F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 8B 41
01 80 42 00 00 00 00 00 00 00 00 00 00 00 8C C2
01 80 42 00 00 00 00 00 00 00 00 00 00 00 8D 9C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 8E 7E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 8F 20
01 80 42 00 00 00 00 00 00 00 00 00 00 00 90 FC
01 80 42 00 00 00 00 00 00 00 00 00 00 00 91 A2
01 80 42 00 00 00 00 00 00 00 00 00 00 00 92 40
01 80 42 00 00 00 00 00 00 00 00 00 00 00 93 1E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 94 9D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 95 C3
01 80 42 00 00 00 00 00 00 00 00 00 00 00 96 21
01 80 42 00 00 00 00 00 00 00 00 00 00 00 97 7F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 98 3E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 99 60
01 80 42 00 00 00 00 00 00 00 00 00 00 00 9A 82
01 80 42 00 00 00 00 00 00 00 00 00 00 00 9B DC
01 80 42 00 00 00 00 00 00 00 00 00 00 00 9C 5F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 9D 01
01 80 42 00 00 00 00 00 00 00 00 00 00 00 9E E3
01 80 42 00 00 00 00 00 00 00 00 00 00 00 9F BD
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A0 42
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A1 1C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A2 FE
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A3 A0
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A4 23
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A5 7D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A6 9F
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A7 C1
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A8 80
01 80 42 00 00 00 00 00 00 00 00 00 00 00 A9 DE
01 80 42 00 00 00 00 00 00 00 00 00 00 00 AA 3C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 AB 62
01 80 42 00 00 00 00 00 00 00 00 00 00 00 AC E1
01 80 42 00 00 00 00 00 00 00 00 00 00 00 AD BF
01 80 42 00 00 00 00 00 00 00 00 00 00 00 AE 5D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 AF 03
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B0 DF
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B1 81
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B2 63
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B3 3D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B4 BE
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B5 E0
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B6 02
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B7 5C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B8 1D
01 80 42 00 00 00 00 00 00 00 00 00 00 00 B9 43
01 80 42 00 00 00 00 00 00 00 00 00 00 00 BA A1
01 80 42 00 00 00 00 00 00 00 00 00 00 00 BB FF
01 80 42 00 00 00 00 00 00 00 00 00 00 00 BC 7C
01 80 42 00 00 00 00 00 00 00 00 00 00 00 BD 22
01 80 42 00 00 00 00 00 00 00 00 00 00 00 BE C0
01 80 42 00 00 00 00 00 00 00 00 00 00 00 BF 9E
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C0 27
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C1 79
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C2 9B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C3 C5
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C4 46
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C5 18
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C6 FA
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C7 A4
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C8 E5
01 80 42 00 00 00 00 00 00 00 00 00 00 00 C9 BB
01 80 42 00 00 00 00 00 00 00 00 00 00 00 CA 59
01 80 42 00 00 00 00 00 00 00 00 00 00 00 CB 07
01 80 42 00 00 00 00 00 00 00 00 00 00 00 CC 84
01 80 42 00 00 00 00 00 00 00 00 00 00 00 CD DA
01 80 42 00 00 00 00 00 00 00 00 00 00 00 CE 38
01 80 42 00 00 00 00 00 00 00 00 00 00 00 CF 66
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D0 BA
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D1 E4
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D2 06
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D3 58
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D4 DB
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D5 85
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D6 67
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D7 39
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D8 78
01 80 42 00 00 00 00 00 00 00 00 00 00 00 D9 26
01 80 42 00 00 00 00 00 00 00 00 00 00 00 DA C4
01 80 42 00 00 00 00 00 00 00 00 00 00 00 DB 9A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 DC 19
01 80 42 00 00 00 00 00 00 00 00 00 00 00 DD 47
01 80 42 00 00 00 00 00 00 00 00 00 00 00 DE A5
01 80 42 00 00 00 00 00 00 00 00 00 00 00 DF FB
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E0 04
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E1 5A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E2 B8
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E3 E6
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E4 65
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E5 3B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E6 D9
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E7 87
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E8 C6
01 80 42 00 00 00 00 00 00 00 00 00 00 00 E9 98
01 80 42 00 00 00 00 00 00 00 00 00 00 00 EA 7A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 EB 24
01 80 42 00 00 00 00 00 00 00 00 00 00 00 EC A7
01 80 42 00 00 00 00 00 00 00 00 00 00 00 ED F9
01 80 42 00 00 00 00 00 00 00 00 00 00 00 EE 1B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 EF 45
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F0 99
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F1 C7
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F2 25
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F3 7B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F4 F8
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F5 A6
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F6 44
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F7 1A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F8 5B
01 80 42 00 00 00 00 00 00 00 00 00 00 00 F9 05
01 80 42 00 00 00 00 00 00 00 00 00 00 00 FA E7
01 80 42 00 00 00 00 00 00 00 00 00 00 00 FB B9
01 80 42 00 00 00 00 00 00 00 00 00 00 00 FC 3A
01 80 42 00 00 00 00 00 00 00 00 00 00 00 FD 64
01 80 42 00 00 00 00 00 00 00 00 00 00 00 FE 86
01 80 42 00 00 00 00 00 00 00 00 00 00 00 FF D8

倒数第二个字节似乎是一个序列号，当它到达 FF 时从 00 开始.我已经包含了从 00 到 FF 的整个范围，以便更容易猜测 crc/checksum 方法.

The second to last byte seems to be a sequential number that starts over at 00 when it reaches FF. I have included the whole range from 00 to FF to make it easier to guess the crc/checksum method.

无法添加评论，所以我将在这里添加信息:

Cant add a comment, so I will add info here:

当前面的 15 个字节都相等时，最后一个字节是相同的.这是设备:http://www.intelektron.com/productos/tya_rei4000.htm

The last byte is the same when all the preceding 15 bytes are equal. This is the device: http://www.intelektron.com/productos/tya_rei4000.htm

更正(而且我认为我在软件中发现了一个错误)设备本身在倒数第二个字节到达 FF 后从 00 重新开始，但是向设备发送命令的软件在到达 FF 时从 01 重新开始.无论如何，我认为倒数第二个序列字节与 crc/校验和问题无关.

CORRECTION (And I think I found a bug in the software) The device itself starts over at 00 after reaching FF in the second to last byte, but the software that sends commands to the device starts over at 01 when it reaches FF. Anyway I think this second to last sequence byte is not relevant to the crc/checksum problem.

澄清列出的数据是软件发送的命令，设备的回复没有列出.设备响应上述每个命令，发送一行存储的数据，例如:

CLARIFICATION The listed data are commands sent by the software, the replies by the device are not listed. The device responds to each of the above commands sending one row of stored data like:

80 01 C2 80 85 01 25 65 57 37 19 32 01 04 76 17

这一行包含一个 4 字节的卡号、时间和日期等，我认为与 crc/校验和问题无关.

This line contains a 4 byte card number, a time and date, etc, not relevant I think to the crc/checksum problem.

附加信息:

我一直在探索该软件的 VB6 ocxs 并得到了这个:

I have been poking around the VB6 ocxs of the software and got this:

Object: clsCRC8
Object: basComunicaciones2
Private sub Proc_1_0_30305330
  loc_30305352: var_8 = 30301198h
  loc_30305373: call basComunicaciones2.SetPropA(edi, arg_8, ebx)
  loc_30305376: var_4 = 0
End Sub

Private sub Proc_1_1_303053A0
  loc_303053C2: var_8 = 303011A0h
  loc_303053E2: call MSVBVM60.DLL.__vbaBoolVarNull(basComunicaciones2.Caption = %x1, arg_8, ebx)
  loc_303053EB: If MSVBVM60.DLL.__vbaBoolVarNull(basComunicaciones2.Caption <> %x1 <>  arg_8 Then GoTo loc_303054B8
  loc_303053F7: var_24 = FFFFFFFFh
  loc_303053FE: var_2C = 11
  loc_30305405: ecx = True
  loc_3030540D: call MSVBVM60.DLL.__vbaUI1I2
  loc_3030541C: edx = edx - 0001h
  loc_30305429: If edx-0001h < 0 Then GoTo loc_30305499
  loc_3030542B: 
  loc_30305443: di = di - basComunicaciones2.%x1 = GetIDsOfNames(%x2) 'Ignore this
  loc_30305447: If di < Me.GetTypeInfo Then GoTo loc_3030544F
  loc_30305449: Err.Raise
  loc_3030544F: 
  loc_30305451: GoTo loc_30305459
  loc_30305453: Err.Raise
  loc_30305459: 
  loc_3030546B: eax = "" And 000000FFh
  loc_30305478: If ecx+eax xor eax < 257 Then GoTo loc_30305480
  loc_3030547A: Err.Raise
  loc_30305480: 
  loc_30305492: var_18 = Var_Ret_1
  loc_30305495: If edi <= Me = %x1 Then GoTo loc_3030542B
  loc_30305499: 
  loc_3030549F: not al
  loc_303054A1: var_18 = Var_Ret_1
  loc_303054A4: var_24 = 0
  loc_303054AB: var_2C = 11
  loc_303054B2: ecx =
  loc_303054B8: 
  loc_303054DC: Exit Sub
End Sub

Private sub Proc_1_2_30306410
  loc_30306432: var_8 = 303011A8h
  loc_3030644F: var_38 = &H4011
  loc_30306489: If Len(Hex()) >= 2 Then GoTo loc_303064A1
  loc_3030649F: var_18 = 808463756 & var_18
  loc_303064A1: 
  loc_303064A6: GoTo loc_303064C1
  loc_303064C0: Exit Sub
  loc_303064C1: 
End Sub

我很确定这会计算数据的 CRC8:

I am pretty shure this calculates the CRC8 of the data:

Method Calcular(Paquete As , CantidadDeBytes As Integer) As Unsigned Small IntegervbpComunicaciones2 的成员(缓存).clsCRC8在接口_clsCRC8中定义

Method Calcular(Paquete As , CantidadDeBytes As Integer) As Unsigned Small Integer Member of vbpComunicaciones2 (cached).clsCRC8 Defined in interface _clsCRC8

任何人都可以从中有所了解吗?很遗憾，我不能.

Anyone can get some sense out of this? sadly, I can´t.

推荐答案

答案就在这里:http://blog.sina.com.cn/s/blog_5a1d5bca0100bjvx.html

0xff - 来自上述链接的算法结果，一切都匹配.花了我 2 个下午和我得到的帮助，但最终还是成功了.

0xff - result from algorithm from above link and everything matches up. Took me 2 afternoons and the help I got here, but finally nailed it.

当然，感谢 Gerhard 发布的链接，我或多或少地了解了该代码的作用.谢谢.

Of course I more or less understand what that code is doing thanks to the link posted by Gerhard. Thank you.

这篇关于找出 RS232 数据的 CRC 或 CHECKSUM的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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