Epson DFX-5000 User Manual page 203

Note:
All interface conditions are based on TTL level. Both the
l
rise and fall 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 the receipt of the ACKNLG signal
or when the level of the BUSY signal is LOW).
The column heading "Direction" refers to the direction of
the signal flow as viewed from the printer.
"Return" denotes the twisted-pair return 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.
Interface timing
The figure below shows the timing for the parallel interface.
Technical Specifications B-9