Table 1-9. Signal And Connector Pin Assignments For Parallel Interface - Epson 4003353 Service Manual

Table 1-9 shows the co nm@or pin assignments and signal functions of the 8-bit parallel interface.

Table 1-9. Signal and Connector Pin Assignments for Parallel Interface

Signal Name
Pin No.
1 STROBE
2-9 DATA 1-8
10
11 BUSY
12 PE
13 SLCT
14 AFXT
31
32 ERROR
35
CHASSIS
16 GND
19-30 -
33,36 -
15,18,34 -
—
1-1o
The STROBE pulse is used to read data from the host
computer. The pulse width must be 0.5 ~ or more. Normally,
I
it is HIGH, and data is latched with the rising edge of this
signal.
DATA 1-8 are parallel data bits. When one of these signals is
HIGH, the data bit is 1; when LOW, the data bit is O. The most
I significant bit (MSB) is DATA 8. The signal state must be
maintained for 0.5 ps on either side of the STROBE signal's
active edge.
approximately 10 p.s. This signal goes LOW upon the
o
completion of data reception to indicate that the printer is
ready to receive further data.
The BUSY signal informs the host computer of the printer's
status. When this signal is HIGH, the printer cannot accept
o
any more data.
This signal indicates whether paper is available in the printer
o
or not. A HIGH level indicates no paper.
o Pulled up to +5V through a 1.0 KQ resistor in the printer.
If this signal is set to LOW, the printer automatically performs
one line feed upon receipt of a CR (carriage return) code. The
I
status of this signal is checked onty at power on and
initialization.
If this signal goes LOW, the printer is initialized. The pulse
I
width of this signal must be 50 @ or more.
This signal goes LOW if the printer has a fatal error or runs
o
out of paper.
Pulled up to +5V through 1.0 KQ resistor in the printer.
- Chassis ground.
Signal ground.
. .
.
Not
Description
Rev. A