對于很多同學來講，在PLC編程、HMI組態中，特別是PLC通訊編程中經常會碰到這個問題。比如標準的ASCII編碼轉換，需要對照對應表。多年前我為了方便還自己做了文檔。比如下面這樣的：【在線工具，在二樓】
ASCII碼 | 字符 |
| 16進制 | 10進制 | 2進制 |
| 0x00 | 0 | 00000000 | NUL 空 |
| 0x01 | 1 | 00000001 | SOH 標題開始 |
| 0x02 | 2 | 00000010 | STX 正文開始 |
| 0x03 | 3 | 00000011 | ETX 正文結束 |
| 0x04 | 4 | 00000100 | EOT 傳輸結束 |
| 0x05 | 5 | 00000101 | ENQ 詢問字符 |
| 0x06 | 6 | 00000110 | ACK 承認 |
| 0x07 | 7 | 00000111 | BEL 報警 |
| 0x08 | 8 | 00001000 | BS 退一格 |
| 0x09 | 9 | 00001001 | HT 橫向制表 |
| 0x0A | 10 | 00001010 | LF 換行 |
| 0x0B | 11 | 00001011 | VT 垂直制表 |
| 0x0C | 12 | 00001100 | FF 走紙控制 |
| 0x0D | 13 | 00001101 | CR 回車 |
| 0x0E | 14 | 00001110 | SO 移位輸出 |
| 0x0F | 15 | 00001111 | SI 移位輸入 |
| 0x10 | 16 | 00010000 | DLE 數據鏈路轉義 |
| 0x11 | 17 | 00010001 | DC1 設備控制1 |
| 0x12 | 18 | 00010010 | DC2 設備控制2 |
| 0x13 | 19 | 00010011 | DC3 設備控制3 |
| 0x14 | 20 | 00010100 | DC4 設備控制4 |
| 0x15 | 21 | 00010101 | NAK 否定 |
| 0x16 | 22 | 00010110 | SYN 空轉同步 |
| 0x17 | 23 | 00010111 | ETB 信息組傳送結束 |
| 0x18 | 24 | 00011000 | CAN 作廢 |
| 0x19 | 25 | 00011001 | EM 紙盡 |
| 0x1A | 26 | 00011010 | SUB 換置 |
| 0x1B | 27 | 00011011 | ESC 換碼 |
| 0x1C | 28 | 00011100 | FS 文字分隔符 |
| 0x1D | 29 | 00011101 | GS 組分隔符 |
| 0x1E | 30 | 00011110 | RS 記錄分隔符 |
| 0x1F | 31 | 00011111 | US 單元分隔符 |
| 0x20 | 32 | 00100000 | (space) |
| 0x21 | 33 | 00100001 | ！ |
| 0x22 | 34 | 00100010 | ” |
| 0x23 | 35 | 00100011 | # |
| 0x24 | 36 | 00100100 | $ |
| 0x25 | 37 | 00100101 | % |
| 0x26 | 38 | 00100110 | & |
| 0x27 | 39 | 00100111 | ' |
| 0x28 | 40 | 00101000 | ( |
| 0x29 | 41 | 00101001 | ) |
| 0x2A | 42 | 00101010 | * |
| 0x2B | 43 | 00101011 | + |
| 0x2C | 44 | 00101100 | , |
| 0x2D | 45 | 00101101 | - |
| 0x2E | 46 | 00101110 | . |
| 0x2F | 47 | 00101111 | / |
| 0x30 | 48 | 00110000 | 0 |
| 0x31 | 49 | 00110001 | 1 |
| 0x32 | 50 | 00110010 | 2 |
| 0x33 | 51 | 00110011 | 3 |
| 0x34 | 52 | 00110100 | 4 |
| 0x35 | 53 | 00110101 | 5 |
| 36 | 54 | 00110110 | 6 |
| 0x37 | 55 | 00110111 | 7 |
| 0x38 | 56 | 00111000 | 8 |
| 0x39 | 57 | 00111001 | 9 |
| 0x3A | 58 | 00111010 | : |
| 0x3B | 59 | 00111011 | ; |
| 0x3C | 60 | 00111100 | < |
| 0x3D | 61 | 00111101 | = |
| 0x3E | 62 | 00111110 | > |
| 0x3F | 63 | 00111111 | ? |
| 0x40 | 64 | 01000000 | @ |
| 0x41 | 65 | 01000001 | A |
| 0x42 | 66 | 01000010 | B |
| 0x43 | 67 | 01000011 | C |
| 0x44 | 68 | 01000100 | D |
| 0x45 | 69 | 01000101 | E |
| 0x46 | 70 | 01000110 | F |
| 0x47 | 71 | 01000111 | G |
| 0x48 | 72 | 01001000 | H |
| 0x49 | 73 | 01001001 | I |
| 0x4A | 74 | 01001010 | J |
| 0x4B | 75 | 01001011 | K |
| 0x4C | 76 | 01001100 | L |
| 0x4D | 77 | 01001101 | M |
| 0x4E | 78 | 01001110 | N |
| 0x4F | 79 | 01001111 | O |
| 0x50 | 80 | 01010000 | P |
| 0x51 | 81 | 01010001 | Q |
| 0x52 | 82 | 01010010 | R |
| 0x53 | 83 | 01010011 | S |
| 0x54 | 84 | 01010100 | T |
| 0x55 | 85 | 01010101 | U |
| 0x56 | 86 | 01010110 | V |
| 0x57 | 87 | 01010111 | W |
| 0x58 | 88 | 01011000 | X |
| 0x59 | 89 | 01011001 | Y |
| 0x5A | 90 | 01011010 | Z |
| 0x5B | 91 | 01011011 | [ |
| 0x5C | 92 | 01011100 | \ |
| 0x5D | 93 | 01011101 | ] |
| 0x5E | 94 | 01011110 | ^ |
| 0x5F | 95 | 01011111 | _ |
| 0x60 | 96 | 01100000 | ` |
| 0x61 | 97 | 01100001 | a |
| 0x62 | 98 | 01100010 | b |
| 0x63 | 99 | 01100011 | c |
| 0x64 | 100 | 01100100 | d |
| 0x65 | 101 | 01100101 | e |
| 0x66 | 102 | 01100110 | f |
| 0x67 | 103 | 01100111 | g |
| 0x68 | 104 | 01101000 | h |
| 0x69 | 105 | 01101001 | i |
| 0x6A | 106 | 01101010 | j |
| 0x6B | 107 | 01101011 | k |
| 0x6C | 108 | 01101100 | l |
| 0x6D | 109 | 01101101 | m |
| 0x6E | 110 | 01101110 | n |
| 0x6F | 111 | 01101111 | o |
| 0x70 | 112 | 01110000 | p |
| 0x71 | 113 | 01110001 | q |
| 0x72 | 114 | 01110010 | r |
| 0x73 | 115 | 01110011 | s |
| 0x74 | 116 | 01110100 | t |
| 0x75 | 117 | 01110101 | u |
| 0x76 | 118 | 01110110 | v |
| 0x77 | 119 | 01110111 | w |
| 0x78 | 120 | 01111000 | x |
| 0x79 | 121 | 01111001 | y |
| 0x7A | 122 | 01111010 | z |
| 0x7B | 123 | 01111011 | { |
| 0x7C | 124 | 01111100 | | |
| 0x7D | 125 | 01111101 | } |
| 0x7E | 126 | 01111110 | ~ |
| 0x7F | 127 | 01111111 | DEL 刪除 |
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