Epson LQ-850X User Manual - Page 263
Interface Specifications, Parallel Interface
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Interface Specifications Your printer is equipped with both a parallel and a serial interface. For specifications on optional interfaces, see the manuals provided with the interfaces. Parallel Interface Pin assignments for the parallel interface Connector pin assignments and a description of their respective interface signals are shown in the following table. Signal Return Pin Pin 1 19 2 20 3 21 4 22 5 23 6 24 7 25 8 26 9 27 10 28 Signal Direction Description STROBE IN STROBE pulse to read data. Pulse width must be more than 0.5 microseconds at the receiving terminal. DATA 1 DATA 2 DATA 3 DATA 4 DATA 5 DATA 6 DATA 7 DATA 8 IN These signals represent information of IN the 1st to 8th bits of parallel data, IN respectively. Each signal is at HIGH IN level when data is logical 1 and LOW IN when it is logical 0. IN IN IN ACKNLG OUT About an 11 -microsecond pulse. LOW indicates that data has been received and that the printer is ready to accept 11 29 BUSY OUT A HIGH signal indicates that the printer cannot receive data. The signal goes HIGH in the following cases: 1) During data entry (ea. char. time) 2) During printing 3) When off line 4) During printer-error state 8-10 Technical Specifications