Epson Stylus Pro XL Service Manual page 8

Stylus Pro XL+
Table 1-2 shows connector pin assignments and signal functions of the 8-bit parallel interface forward
channel.
Table 1-2. Signal and Connector Pin Assignments for the Parallel Interface
Signal
Pin No.
Name
1 STROBE
2-9 DATA 0-7
10 ACKNLG
11 BUSY
12 PE
13 SLCT
14 AFXT
31 INIT
32 ERROR
18 Logic H
35 +5 V
36 SLIN
Chassis
17
GND
16, 33,
GND
19-30
15, 34 NC
* The I/O column indicates the direction of the signal as viewed from the printer.
Rev.A
(Forward Channel)
Return
I/O*
GND Pin
The STROBE pulse is used to read data from the host
computer. Pulse width must be 0.5 s or more. Normally,
19 I
it is HIGH, and data is latched with the rising edge of this
signal.
DATA 0-7 are parallel data bits. When one of these
signals is HIGH, the data bit is 1; when LOW, the data bit
is 0. The most significant bit (MSB) is DATA 8. The
20 - 27 I
signal state must be maintained for 0.5 s on either side
of the STROBE signal's active edge.
ACKNLG is a negative pulse indicating that the printer
28 O
can accept data again.
The BUSY signal informs the host computer of the
29 O printer's status. When this signal is HIGH, the printer
cannot accept any more data.
This signal indicates whether paper is available in the
28 O
printer or not. A HIGH level indicates no paper.
28 O This signal is always at HIGH while printer power is on.
30 I Not used.
If this signal goes LOW, the printer is initialized. The
30 I
pulse width of this signal must be 50 s or more.
29 O This signal goes LOW if the printer has detected an error.
— O
Pulled up to +5 V through 3.9K
— — Pulled up to +5 V through 3.3K
30 I Not used.
— — Chassis ground.
— — Signal ground.
— — Not connected
Product Description
Description
resistor in the printer.
resistor in the printer.
1-5