Product information guide

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
pin
Return
pin Signal Direction Description
119
STROBE
IN
STROBE pulse to read data.
2
3
4
5
6
7
8
9
20
21
22
23
24
25
26
27
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
DATA 8
IN
IN
IN
IN
IN
IN
IN
IN
These signals represent
information in bits 0 to 7 of
parallel data respectively.
Each signal is at HIGH level
when data is logical 1 and
LOW when it is logical 0.
10 28
ACKNLG
OUT
About a 5-
µ
s pulse. LOW
indicates data has been
received and the printer is
ready to accept more data.
11 29 BUSY 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
12 28 PE OUT
A HIGH signal indicates the
printer is in a paper-out
state or in an error state.
13 28 SLCT OUT
Pulled up to +5 V through
1 k
Ω
resistance
14 30 AFXT IN
Not used
15 - NC -
Not used
16 - GND -
Logic ground level
17 - CHASSIS
GND
-
Printer’s chassis ground,
which is connected to the
logic ground
18 - Logic H OUT
Not used
19-30 - GND -
Twisted-pair return signal
ground level
Signal
pin
Return
pin Signal Direction Description
31 30
INIT
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
µ
s at the
receiving terminal.
32 29
ERROR
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
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 30 SLIN IN
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
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
EPSON Stylus COLOR IIs
EPSON Stylus COLOR IIs-4 8/1/95 Ink Jet Printers