Chapter 6: NCR 5977 Graphical Display
Programming
Host/Retail Display Command Interface
The Retail Display accepts two types of data: display data and command data.
• If a byte received from the host is any character between 0x20 to 0xFF or a double
byte character code, it is processed as a character and is displayed on the NCR 5977
Graphical Display.
• If the following characters are received, the subsequent bytes are processed as a
command.
• Back Space (0x08)
• Horizontal Tab (0x09)
• Line Feed (0x0A)
• Home Position (0x0B)
• Display Clear (0x0C)
• Carriage Return (0x0D)
• ESC (0x1B)
• Unit Separator (0x1F)
• If the subsequent byte is an invalid command, it is ignored.
Note: Each command consists of at least two bytes. The first byte (0x1B) or (0x1F) is a
command identifier indicating that the next byte is a command byte. The command
byte may be followed by a parameter or by data bytes depending on the command.
To Next Page
Loading...
