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P rin t e r I n t e rf ac e I n f o rmat io n | HP De s k J e t P rin t e rs |
DOS I/O Interface Description
The
HP DeskJet printers have an IEEE
Compatibility Mode
Nibble Mode
Extended Capabilities Port (ECP) mode
Printer drivers on host computers "negotiate" with the printer to switch from one mode to another. If an error occurs while in Nibble or ECP mode, the interface automatically reverts to Compatibility mode.
HP DeskJet printer drivers meet the IEEE
Level 1 devices drive the interface with 5 V TTL circuits. Their requirements are consistent with
Level 2 devices use output drivers with
Compatibility Mode
Compatibility mode is a unidirectional mode of operation in which data flows from the host computer to the printer. It is the mode that has, in the past, been called “Centronics.”