Table 2. ASCII/Hex Cross-reference
+=======+=======+============================================================+ | ASCII | Hex | Description | +=======+=======+============================================================+ | SOH | 01 | Start of header | +-------+-------+------------------------------------------------------------+ | STX | 02 | Start of text | +-------+-------+------------------------------------------------------------+ | ETX | 03 | End of text | +-------+-------+------------------------------------------------------------+ | ACK | 06 | Positive acknowledgement | +-------+-------+------------------------------------------------------------+ | DC1 | 11 | Device control 1 | +-------+-------+------------------------------------------------------------+ | DC2 | 12 | Device control 2 | +-------+-------+------------------------------------------------------------+ | NAK | 15 | Negative acknowledgement | +-------+-------+------------------------------------------------------------+ | CAN | 18 | Cancel | +-------+-------+------------------------------------------------------------+ | ESC | 1B | Escape sequence | +-------+-------+------------------------------------------------------------+ | RS | 1E | Record separator | +-------+-------+------------------------------------------------------------+The following legends and symbols are used when describing the communications control commands.
Table 3. Communication Legends and Symbols
+===============+============================================================+ | Legend/Symbol | Description | +===============+============================================================+ | => | Transmission from terminal controller to terminal | +---------------+------------------------------------------------------------+ | <= | Transmission from terminal to terminal controller | +---------------+------------------------------------------------------------+ | addr | Terminal address (lower case ASCII a-y and 0-6 or z for | | | broadcast). Provides 32 terminal addresses. | +---------------+------------------------------------------------------------+ | CMD | Command ID character sent to terminal | +---------------+------------------------------------------------------------+ | CS1, CS2 | Checksum characters | +---------------+------------------------------------------------------------+ | data | ASCII characters sent to the terminal controller from a | | | terminal as a result of a poll or command | +---------------+------------------------------------------------------------+ | text | Parameters and data associated with a command sent to a | | | terminal from the terminal controller | +---------------+------------------------------------------------------------+ | RS | Record separator | +---------------+------------------------------------------------------------+ | f | File identifier | +---------------+------------------------------------------------------------+(Ref #2.)