Epson P-40 Operating Manual page 45

B.2 Parallel Interface
{Specifications]
Data transmission:
Synchronization:
Handshake protocal:
Signal levels:
{Interface connector]
Plug:
8-bit parallel
Timing for the printer to read data signals is provided by
external strobe signals
By ACKNLG and Busy signals
The levels of input data and interface control signals are
all TTLcompatible.
57-30360 (AMPHENOL)
The connector cable should be kept as short as possible.
[Input connector pin assignments and description of signals]
Pin Return line Signal name Sender Description
1 19 STROBE Host computer Provides the timing at
which the printer reads
data signals. This
signal is active low, and
data signals are read
after this signal has
dropped to Low. The
pulse width must be
0.5 ps or longer at the
receiving end.
2 20 DATAOQ Host computer Data bits 0 to 7.
3 21 DATAI Host computer "HIGH" indicates "1"
4 22 DATA2 Host computer and "LOW" indicates
5 23 DATA3 Host computer "0",
6 24 DATA4 Host computer
7 25 DATAS Host computer
8 26 DATA6 Host computer
9 27 DATA7 Host computer
10 28 ACKNLG Printer When LOW, indicates
that the printer has
received the last data
sent and that it is
ready to receive the
next data.
The pulse width is
about 18 ys.
39