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
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