ASCII可显示字符
| 十进制 | 十六进制 | 图形 |
| 32 | 0x20 | (空格) |
| 33 | 0x21 | ! |
| 34 | 0x22 | " |
| 35 | 0x23 | # |
| 36 | 0x24 | $ |
| 37 | 0x25 | % |
| 38 | 0x26 | & |
| 39 | 0x27 | ' |
| 40 | 0x28 | ( |
| 41 | 0x29 | ) |
| 42 | 0x2A | * |
| 43 | 0x2B | + |
| 44 | 0x2C | , |
| 45 | 0x2D | - |
| 46 | 0x2E | . |
| 47 | 0x2F | / |
| 48 | 0x30 | 0 |
| 49 | 0x31 | 1 |
| 50 | 0x32 | 2 |
| 51 | 0x33 | 3 |
| 52 | 0x34 | 4 |
| 53 | 0x35 | 5 |
| 54 | 0x36 | 6 |
| 55 | 0x37 | 7 |
| 56 | 0x38 | 8 |
| 57 | 0x39 | 9 |
| 58 | 0x3A | : |
| 59 | 0x3B | ; |
| 60 | 0x3C | < |
| 61 | 0x3D | = |
| 62 | 0x3E | > |
| 63 | 0x3F | ? |
| 64 | 0x40 | @ |
| 65 | 0x41 | A |
| 66 | 0x42 | B |
| 67 | 0x43 | C |
| 68 | 0x44 | D |
| 69 | 0x45 | E |
| 70 | 0x46 | F |
| 71 | 0x47 | G |
| 72 | 0x48 | H |
| 73 | 0x49 | I |
| 74 | 0x4A | J |
| 75 | 0x4B | K |
| 76 | 0x4C | L |
| 77 | 0x4D | M |
| 78 | 0x4E | N |
| 79 | 0x4F | O |
| 80 | 0x50 | P |
| 81 | 0x51 | Q |
| 82 | 0x52 | R |
| 83 | 0x53 | S |
| 84 | 0x54 | T |
| 85 | 0x55 | U |
| 86 | 0x56 | V |
| 87 | 0x57 | W |
| 88 | 0x58 | X |
| 89 | 0x59 | Y |
| 90 | 0x5A | Z |
| 91 | 0x5B | [ |
| 92 | 0x5C | \ |
| 93 | 0x5D | ] |
| 94 | 0x5E | ^ |
| 95 | 0x5F | _ |
| 96 | 0x60 | ` |
| 97 | 0x61 | a |
| 98 | 0x62 | b |
| 99 | 0x63 | c |
| 100 | 0x64 | d |
| 101 | 0x65 | e |
| 102 | 0x66 | f |
| 103 | 0x67 | g |
| 104 | 0x68 | h |
| 105 | 0x69 | i |
| 106 | 0x6A | j |
| 107 | 0x6B | k |
| 108 | 0x6C | l |
| 109 | 0x6D | m |
| 110 | 0x6E | n |
| 111 | 0x6F | o |
| 112 | 0x70 | p |
| 113 | 0x71 | q |
| 114 | 0x72 | r |
| 115 | 0x73 | s |
| 116 | 0x74 | t |
| 117 | 0x75 | u |
| 118 | 0x76 | v |
| 119 | 0x77 | w |
| 120 | 0x78 | x |
| 121 | 0x79 | y |
| 122 | 0x7A | z |
| 123 | 0x7B | { |
| 124 | 0x7C | | |
| 125 | 0x7D | } |
| 126 | 0x7E | ~ |
ASCII控制字符
| 十进制 | 十六进制 | 缩写 | 意义 |
| 0 | 0x00 | NUL | 空字符(Null) |
| 1 | 0x01 | SOH | 标题开始 |
| 2 | 0x02 | STX | 本文开始 |
| 3 | 0x03 | ETX | 本文结束 |
| 4 | 0x04 | EOT | 传输结束 |
| 5 | 0x05 | ENQ | 请求 |
| 6 | 0x06 | ACK | 确认回应 |
| 7 | 0x07 | BEL | 响铃 |
| 8 | 0x08 | BS | 退格 |
| 9 | 0x09 | HT | 水平定位符号 |
| 10 | 0x0A | LF | 换行键 |
| 11 | 0x0B | VT | 垂直定位符号 |
| 12 | 0x0C | FF | 换页键 |
| 13 | 0x0D | CR | 归位键 |
| 14 | 0x0E | SO | 取消变换(Shift out) |
| 15 | 0x0F | SI | 启用变换(Shift in) |
| 16 | 0x10 | DLE | 跳出数据通讯 |
| 17 | 0x11 | DC1 | 设备控制一(XON 启用软件速度控制) |
| 18 | 0x12 | DC2 | 设备控制二 |
| 19 | 0x13 | DC3 | 设备控制三(XOFF 停用软件速度控制) |
| 20 | 0x14 | DC4 | 设备控制四 |
| 21 | 0x15 | NAK | 确认失败回应 |
| 22 | 0x16 | SYN | 同步用暂停 |
| 23 | 0x17 | ETB | 区块传输结束 |
| 24 | 0x18 | CAN | 取消 |
| 25 | 0x19 | EM | 连接介质中断 |
| 26 | 0x1A | SUB | 替换 |
| 27 | 0x1B | ESC | 跳出 |
| 28 | 0x1C | FS | 文件分割符 |
| 29 | 0x1D | GS | 组群分隔符 |
| 30 | 0x1E | RS | 记录分隔符 |
| 31 | 0x1F | US | 单元分隔符 |
| 127 | 0x7F | DEL | 删除 |
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