Timing Chart - Epson PRO Reference Manual

Signal Return
pin pin
33
34
35
36
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.
BUSY
ACKNLG
DATA
STROBE
0.5 s (Min.)
Transition time (both the rise and the fall) of every signal must be less than
0.2 s.
Signal
- GND
- NC
- +5 V
- NC
0 s (Min.)
Direction Description
- Same as for pins 19-30
- Not used
OUT Pulled up to +5 V through
1 K resistance
- Not used
Technical Specifications
0 s (Min.)
5 s (Typ.)
B-11