Epson Stylus Pro User Manual - Page 76

Timing chart, Notes

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Signal pin 33 34 35 Return pin - Signal GND NC +5 V 36 - NC Direction - OUT - Description Same as for pins 19-30 Not used Pulled up to +5 V through 1 KΩ resistance Not used Notes: u The column heading "Direction" refers to the direction of signal flow as viewed from the printer. u "Return pin" denotes the twisted-pair return pin to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side. u All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds. u Data transfer must be carried out by observing the ACKNLG or BUSY signal. Data transfer to this printer can be carried out only after receipt of the ACKNLG signal or when the level of the BUSY signal is LOW. Timing chart The figure below shows the timing chart for the parallel interface. BUSY ACKNLG DATA STROBE 0.5 µs (Min.) 0 µs (Min.) 0 µs (Min.) 5 µs (Typ.) Transition time (both the rise and the fall) of every signal must be less than 0.2 µs. Technical Specifications B-11

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Signal
pin
Return
pin
Signal
Direction
Description
33
-
GND
-
Same as for pins 19-30
34
-
NC
-
Not used
35
-
+5 V
OUT
Pulled up to +5 V through
1 K
Ω
resistance
36
-
NC
-
Not used
Notes:
The column heading “Direction” refers to the direction of signal flow as
viewed from the printer.
“Return pin” denotes the twisted-pair return pin to be connected at signal
ground level. For the interface wiring, be sure to use a twisted-pair cable for
each signal and to complete the connection on the return side.
All interface conditions are based on TTL level. Both the rise and fall times of
each signal must be less than 0.2 microseconds.
Data transfer must be carried out by observing the
ACKNLG or BUSY
signal. Data transfer to this printer can be carried out only after receipt of
the
ACKNLG signal or when the level of the BUSY signal is LOW.
Timing chart
The figure below shows the timing chart for the parallel interface.
Transition time (both the rise and the fall) of every signal must be less than
0.2
μ
s.
BUSY
DATA
0.5
μ
s (Min.)
0
μ
s (Min.)
5
μ
s (Typ.)
0
μ
s (Min.)
ACKNLG
STROBE
Technical Specifications
B-11