Interface Specifications; Figure 1-7. Data Transmission Timing - Epson Stylus 800 Service Manual

Stylus 800+ service Manual

1.3 INTERFACE SPECIFICATIONS

The Stylus 800+ is equipped with an 8-bit parallel interface, standard.
Data format:
Synchronization:
Handshaking:
Signal level:
Adaptable connector:
Data transmission timing:
DATA
Table 1-8 shows the comector pin assignments and signal functions of the 8-bit parallel interface.
Table 1-8. Signal and Connector Pin Assignments
Pin No. Signal Name
1 STROBE
2-9 DATA 1-8
10
11 BUSY
12 PE
13 SLCT
14 AFXT
15
NC
Rev. A
8 bit parallel
STROBE pulse synchronization
By BUSY and ACKNLG signals
36-pin 57-30364) (Amphenol) or equivalent
See Figure 1-7.

Figure 1-7. Data Transmission Timing

The STROBE pulse is used to read data from the host computer.
The pulse width must be 0.5p.sor more. Normally, it is HIGH,
and data is latched with 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 p.s on either side of STROBE signal's active
edge.
approximately 10 p.s. This signal goes LOW on completion of
o
data reception to indicate the printer is ready to receive further
data.
The BUSY signal informs the host computer of the printet's
o
status. When this signal is HIGH, the printer cannot accept
This signal indicates whether paper is available in the printer or
o
not. A HIGH level indicates no paper.
o
Pulled up to +5 V through a 1.OK S2 resistor in the printer.
If this signal is set to LOW, the printer automatically performs
I one line feed upon receipt of a CR (carriage return) code. The
status of this signal is checked only at power on and initialization
—
Not
Description
1-11