Epson 680Pro Service Manual - Page 15
Table 1-4. Typical Time of tack, Table 1-5. Signal Level: TTL Compatible IEEE-1284 level 1 device
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EPSON Stylus COLOR 680/777/777i Table 1-4. Typical Time of tack Parallel I/F Mode Typical Time of tack High Speed 0.5us Normal Speed 2us Table 1-5. Signal Level: TTL Compatible (IEEE-1284 level 1 device) Parameter Minimum Maximum Condition VOH* - 5.5V VOL* -0.5V - IOH* - 0.32mA VOH = 2.4V IOL* - 12mA VOL = 0.4V CO - 50pF VIH - 2.0V VIL 0.8V - IIH - 0.32mA VIH = 2.0V IIL - 12mA VIL = 0.8V CI - 50pF * A low logic level on the Logic H signal is 2.0V or less when the printer is powered off, and this signal is equal to or exceeding 3.0V when the printer is powered on. The receiver shall provide an impedance equivalent to 7.5K ohm to ground. Revision B Table 1-6. Connector Pin Assignment and Signals Pin No. Signal Name Return GND Pin In/Out Functional Description 1 -STROBE 19 The strobe pulse. Read-in of data is In performed at the falling edge of this pulse. 2 DATA0 20 In 3 DATA1 21 In 4 DATA2 22 In The DATA0 through DATA7 signals 5 DATA3 23 In represent data bits 0 to 7, respectively. Each signal is at high level when data is 6 DATA4 24 In logical 1 and low level when data is 7 DATA5 25 In logical 0. 8 DATA6 26 In 9 DATA7 27 In 10 -ACKNLG 28 Out This signal is a negative pulse indicating that the printer can accept data again. 11 BUSY 29 Out A high signal indicates that the printer cannot receive data. 12 PE 28 Out A high signal indicates paper-out error. 13 SLCT 28 Out Always at high level when the printer is powered on. 14 -AFXT 30 In Not used. The falling edge of a negative pulse or a 31 -INIT 30 In low signal on this line causes the printer to initialize. Minimum 50us pulse is necessary. 32 -ERROR 29 Out A low signal indicates printer error condition. 36 -SLIN 30 In Not used. 18 Logic H - Out Pulled up to +5V via 3.9 K ohm resistor. PRODUCT DESCRIPTION INTERFACE 15