Epson 890N - FX B/W Dot-matrix Printer, Service Manual

Page: 24 / 129

EPSON FX-890/2190 Revision B
PRODUCT DESCRIPTIONS Interface 24
†
Data transmission timing
Figure 1-7. Data transmission timing
Note “*1”: Rise and fall time of output signals
“*2” : Rise and fall time of input signals
†
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
Table 1-26. Parameters
Parameter Minimum Maximum
t setup 500 nsec _
t hold 500 nsec _
t stb 500 nsec _
t ready 0 _
t busy _ 500 nsec
t reply _ _
t ack 500 nsec 10 us
t nbusy 0 _
t next 0 _
t tout*
1
_ 120 nsec
t tin* 2 _ 200 nsec
DATA
-STROBE
BUSY
-ACKNLG
data byte n
data byte n+1
t hold
t setup t stb
t next
t ready
t busy
t reply
t ack
t nbusy