Lexmark Forms Printer 2490 Technical Reference - Page 95
Timing, The following chart shows the timing in microseconds of these signals.
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Pin Line Description 31 INIT* INIT* from the system resets the printer to its initial poweron-state. The BUSY line goes high, and any received data is printed. When INIT* goes low, the printer resets to the poweron default state. If data is in the USB buffer, the USB FIFO is not reset. 32 ERROR* The printer sets the ERROR* line low if the printer detects an error or out-of-paper condition. A critical error condition exists when both ERROR* and PE are low. 33 GND Ground level. 34-35 Not used. 36 SELECT IN The printer does not respond to the DC1/DC3 code when this signal, valid only in Epson mode, is low. * Inverted logic (signal is active when low). Timing The following chart shows the timing in microseconds of these signals. 95 Section 6: Using the Printer Interface