Detection of the condition of a printer

摘要

A printing apparatus has, in addition to a normal command interpreter (66), a real-time command interpreter (64) for simultaneously analyzing control commands as data is received from a host device. This real-time command interpreter functions even when the printing apparatus is off-line, thereby enabling the status of the printing apparatus to be known even when the printing apparatus is not operating. Thus, the host device can be notified of the cause for non-operation thereby achieving a high throughput rate printing. The user can cancel a cut-sheet paper insertion wait-state at any time. Why an error occurred can be determined in an off-line state to enable recovery from the error. <IMAGE>