Service manual

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