Epson 890N Service Manual - Page 24

EPSON FX-890/2190 † Data transmission timing DATA -STROBE BUSY -ACKNLG data byte n t hold t setup t stb data byte n+1 t next t ready t busy t reply t ack t nbusy Figure 1-7. Data transmission timing Table 1-26. Parameters Parameter t setup Minimum 500 nsec t hold 500 nsec t stb 500 nsec t ready 0 t busy _ t reply _ t ack 500 nsec t nbusy 0 t next 0 t tout*1 _ t tin*2 _ Note "*1": Rise and fall time of output signals "*2" : Rise and fall time of input signals Maximum _ _ _ _ 500 nsec _ 10 us _ _ 120 nsec 200 nsec Revision B † BUSY signal is active (high level) under any of the following conditions: „ In the process of receiving data „ Input buffer full „ -INT signal active (low level) „ During hardware initialization „ -ERROR or PE signal active (low level or high level, respectively) „ In the self test mode „ In the adjustment mode „ In the default-setting mode † -ERROR signal is active (low level) under any of the following conditions: „ In the condition of the printer hardware error (fatal error) „ In the condition of the paper-out error „ In the condition of the release lever error „ In the condition of the cover open error „ In the condition of the paper eject error † PE signal is active (high level) under the following condition: „ In the condition of paper-out error PRODUCT DESCRIPTIONS Interface 24