HP 5961-0509 manual Downloading, DTR Polarity, Escape Character, Escape Sequence or PCL Command

Downloading

The process of transferring soft fonts, macros, or raster data from a host computer to the printer’s user memory is called downloading.

DTR Polarity

The configuration of DTR polarity determines whether pin 20, on the serial interface connector, is high or low when the printer is ready. If DTR polarity is HI, pin 20 is high when the printer is ready. If DTR polarity is LO, pin 20 is low when the printer is ready.

Escape Character

The first character of a PCL command (or “escape sequence”) is identified by the ? symbol, (ASCII decimal code 27). This character is a control code used specifically by the printer to identify a string of characters as a printer command. As the printer monitors incoming data from a computer, it is “looking” for this character. When this character appears, the printer reads it and its associated characters as a command to be performed, and not data to be printed.

Escape Sequence (or “PCL Command”)

PCL escape sequences consist of two or more characters. The first character is always the escape character, which is identified by the ? symbol. This character is a control code used specifically by the printer to identify a string of characters as a printer command. As the printer monitors incoming data from a computer, it is “looking” for this character. When this character appears, the printer reads it and its associated characters as a command to be performed, and not as data to be printed. (Also see PCL commands.)

Factory Default

These are the settings that are programmed into the printer at the factory. These settings are in use unless you override them using either the control panel or by sending printer commands.

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