SNLUS
800 Service
Manual
GenemlDescription
1.3 INTERFACE SPECIFICATION
The Stylus 800 is equipped with an 8 bit parallel interface, standard.
Data format:
8 bit parallel
Synchronization:
STROBE pulse
swchronization
Handshaking:
By BUSY and
ACKNLG
signals
Signal level:
TTL-compatible
level
Adaptable connector:
36-pin 57-30360
(Amphenol)
or equivalent
Data transmission timing:
See Figure 1-7.
i’b--
\
DATA
STROBE—
—
L!&
L-
O. SuS(Min.)
O.
SuS(Min.)
O.
SuS(Min.)
Figure 1-7. Data Transmission Timing
Table 1-6 shows the connector pin assignments and signal functions of the 8-bit parallel interface.
Table 1-6. Signal and Connector Pin Assignments
Pin No.
Signal Name
1/0
Description
The STROBE pulse is used to read data from the host
1
STROBE
I
computer. The pulse width must be 0.5@ or 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
2-9 DATA 1-8
I
significant bit
(MSB)
is DATA 8. The signal state must be
maintained for 0.5
pS
on either side of STROBE signal’s active
edge.
ACKNLG
is an acknowledge pulse with a width of
10
ACKNLG
o
approximately 10 vS. This signal goes LOW upon the
completion of data reception, to indicates that the printer is
ready to receive further data.
The BUSY signal informs the host computer of the
printe~s
11
BUSY
o
status. When this signal is HIGH, the printer cannot accept
further data.
12 PE
o
This signal indicates whether paper is available in the printer
or not. A HIGH level indicates a no paper condition.
13
SLCT
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
14
AFXT
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.
15
NC
Not
USed.
Rev.
A
1-9
