Chapter 2 External I/O Specification 2 1 Input and output directions are described as viewed from the printer. Input: Signal input to the printer from an external device. Output: Signal output from the printer to an external device. 2 The logic for output signals can be reversed. The information provided in the Description column is based on the default signal logic. If the signal logic is reversed, it will be the opposite. 3 The logic for input signals is low active. (The logic for input signals cannot be reversed.) 4 The "Start print" signal and "End print" signal can be switched between pulse and level.
5 The results of the previous nozzle check are applied to the clogged nozzle detected signal (pin 24). Therefore, during a nozzle check, issue a nozzle check command (pin 14) before checking the clogged nozzle detected signal (pin 24). Refer to timing "Timing" on page 49 . 15 Pin Signal Input- Output *1 Pulse/Level Description 22 Ink cartridge exchange*2 Output Level Indicates whether the printer requires an ink cartridge exchange. • L: Ink cartridge exchange required • H: Ink cartridge exchange not required 23 Data ready *2 Output Level Indicates that the generation of print data has completed in the printer. • L: Print data preparation complete • H:
Print data preparation not complete 24 Clogged nozzle detected *2 *5 Output Level Indicates whether the printer has detected a clogged nozzle in the head. • L: Clogged nozzle detected • H: Clogged nozzle not detected * The results of the previous nozzle check are applied. * Even if nozzle clogging is not specified (when a nozzle check is not performed, or if a warn- ing occurs while the state of the nozzles is unclear), the value at that time is maintained. 25 Paper out *2 Output Level Indicates whether the printer is in a paper out state. • L: Paper out • H: No paper out