| 1 | 1 | 1 | 0 | 14   | SO  | RS  | .   | >   | N   | ^   |  n  |   ~ |
|---|---|---|---|------|-----|-----|-----|-----|-----|-----|-----|-----|
| 1 | 1 | 1 | 1 | 15   | SI  | US  | /   | ?   | O   | _   |  o  | DEL |
+----------------------+-----------------------------------------------+










 
RFC 20            ASCII format for Network Interchange      October 1969


3. Character Representation and Code Identification

   The standard 7-bit character representation, with b7 the high-order
   bit and b1 the low-order bit, is shown below:

   EXAMPLE: The bit representation for the character "K," positioned in
   column 4, row 11, is

   b7 b6 b5 b4 b3 b2 b1
   1  0  0  1  0  1  1


   The code table position for the character "K" may also be represented
   by the notation "column 4, row 11" or alternatively as "4/11."  The
   decimal equivalent of the binary number formed by bits b7, b6, and
   b5, collectively, forms the column number, and the decimal equivalent
   of the binary number formed by bits b4, b3, b2, and b1, collectively,
   forms the row number.

   The standard code may be identified by the use of the notation ASCII
   or USASCII.

   The notation ASCII (pronounced as'-key) or USASCII (pronounced you-
   sas'-key) should ordinarily be taken to mean the code prescribed by
   the latest issue of the standard.  To explicitly designate a
   particular (perhaps prior) issue, the last two digits of the year of
   issue may be appended, as, "ASCII 63" or "USASCII 63".

























 
RFC 20            ASCII format for Network Interchange      October 1969


4. Legend

4.1 Control Characters

   NUL Null                                DLE Data Link Escape (CC)

   SOH Start of Heading (CC)               DC1 Device Control 1

   STX Start of Text (CC)                  DC2 Device Control 2

   ETX End of Text (CC)                    DC3 Device Control 3

   EOT End of Transmission (CC)            DC4 Device Control 4 (Stop)

   ENQ Enquiry (CC)                        NAK Negative Acknowledge (CC)

   ACK Acknowledge (CC)                    SYN Synchronous Idle (CC)

   BEL Bell (audible or                    ETB End of Transmission
       attention signal)                       Block (CC)

   BS Backspace (FE)                       CAN Cancel

   HT Horizontal Tabulation                EM End of Medium
      (punched card skip) (FE)