Epson ActionPrinter 5000 User Manual - Page 121
Not used., All interface conditions are based on the TTL level. Both
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Interface Specifications Signal Return P i n Pin 33 34 35 Signal GND NC Direction Description OUT Same as for pins 19-30. Not used. Pulled up to 5 V through 3.3 Kohm 36 SLCT IN I N The DC1/DC3 code is valid only when this signal is HIGH. This signal is always LOW. Note: The column heading "Direction" refers to the direction of signal flow as viewed from the printer. "Return" denotes the twisted-pair return, to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side. All interface conditions are based on the TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds. Data transfer must be carried out by observing the ACKNLG or BUSY signal. (Data transfer to this printer can be carried out only after receipt of the ACKNLG signal or when the BUSY signal is LOW.) 7-12 Technical Specifications