Epson 890N - FX B/W Dot-matrix Printer Service Manual page 24

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