Interface Specifications; Timing Chart - Epson Stylus Color Stylus Color IIs User Manual

EPSON Stylus COLOR IIs

Interface Specifications

Your printer is equipped with an 8-bit parallel interface.
Data format: 8-bit parallel, IEEE P1284 compatible
mode
Synchronization: STROBE pulse
Handshake timing: BUSY and ACKNLG signals
Signal level: TTL compatible
Connector: 36-pin Centronics connector or
equivalent
Pin Assignments
Signal Return
pin pin Signal
1 19
STROBE
2 20 DATA 1
3 21 DATA 2
4 22 DATA 3
5 23 DATA 4
6 24 DATA 5
7 25 DATA 6
8 26 DATA 7
9 27 DATA 8
10 28
ACKNLG
11 29 BUSY
12 28 PE
13 28 SLCT
14 30 AFXT
15 - NC
16 - GND
17 - CHASSIS
GND
18 - Logic H
19-30 - GND
EPSON Stylus COLOR IIs-4
Direction Description
IN STROBE pulse to read data.
These signals represent
IN
information in bits 0 to 7 of
IN
parallel data respectively.
IN
IN Each signal is at HIGH level
when data is logical 1 and
IN
IN LOW when it is logical 0.
IN
IN
OUT About a 5- s pulse. LOW
indicates data has been
received and the printer is
ready to accept more data.
OUT A HIGH signal indicates the
printer cannot receive data.
The signal goes HIGH in the
following cases:
1) During data entry
(for each character)
2) During initialization
3) During self test,
demonstration, and
default setting printing
4) During a printer-error
state
A HIGH signal indicates the
OUT
printer is in a paper-out
state or in an error state.
OUT Pulled up to +5 V through
1 k resistance
Not used
IN
- Not used
Logic ground level
-
- Printer's chassis ground,
which is connected to the
logic ground
Not used
OUT
- Twisted-pair return signal
ground level
Signal Return
pin pin Signal
31 30
INIT
32 29
ERROR
33 - GND
34 - NC
35 - +5 V
36 30 SLIN
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

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.
8/1/95
Direction Description
IN When this signal goes LOW,
the printer controller is reset
to its default state when the
power is first turned on and
the print buffer is cleared.
This level is normally HIGH;
its pulse width must be
more than 50 s at the
receiving terminal.
OUT This signal level goes LOW
when the printer:
1) Is out of paper
2) Is in an error state
3) Has no ink cartridge
installed
- Same as for Pins 19-30
Not used
-
OUT Pulled up to +5 V through
1 K resistance
Not used
IN
0 s (Min.)
5 s (Typ.)
0 s (Min.)
Ink Jet Printers