Epson LQ 870 User Manual - Page 124
Signal Return, Signal, Direction, Description, When PAUSE
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Interface Specifications Signal Return Pin Pin Signal Direction Description 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 PAUSE botton is pressed 4) During printer-error state. 12 30 PE OUT A HIGH signal indicates that the printer is out of paper. 13 - SLCT OUT Pulled up to 5 volts through 3.3 Kohm resistance. 14 - AUTO FEED R=T IN When this signal is LOW, the paper is automatically fed 1 line after printing. (The signal level can be fixed to this by setting DIP switch 2-4 to ON.) 15 - NC Not used. 16 - GND - Logic ground level. 17 - C H A S S I S - Printer's chassis ground, which is GND isolated from the logic ground. 18 - NC Not used. 19-30 - GND - Twisted-pair return signal ground level. 31 16 INIT IN When this level becomes LOW, the printer controller is reset to its power-up state and the print buffer is cleared. This level is normally HIGH; its pulse width must be more than 50 microseconds at the receiving terminal. 32 ERROR OUT This level becomes LOW when the printer is: 1) in paper out state 2) PAUSE 3) in error state. Technical Specifications 7-11