Epson LQ-1170, Руководство по обслуживанию

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REV.-A
1.3 PARALLEL INTERFACE
The specifications for the printer’s 8-bit parallel interface are as follows:
Data format
Synchronization
Handshaking
Signal level
Adaptable connector
Data transmission timing
BUSY
ACKNLG
DATA
STROBE
8-bit parallel
/STROBE signal
BUSY and / ACKNLG signal
TTL-compatible
57-30360 (Amphenol) or equivalent
See Figure 1-6.
Figure 1-6. Data Transmission Timing
Table l-l 1 provides the connector pin assignments and describes the signal functions of the parallel interface.
Table l-l 1. Connector Pin Assignments and Signal Functions
Pin No. Signal Name
Return
Pin No.
Dir.
Function
1 STROBE 19 IN
STROBE pulse to read the input data. Pulse width
must be more than
0.5 Input data is latched at
the falling edge of this signal.
2 DATA 1 2 0 IN Parallel input data to the printer.
3 DATA 2 21 IN HIGH level means data 1.
4 DATA 3 22 IN LOW level means data 0.
5 DATA 4 23 IN
6 DATA 5 24 IN
7 DATA 6 25 IN
8 DATA 7 26 IN
9 DATA 8 27 IN
IO ACKNLG 28
OUT
This pulse indicates data has been received and
the printer is ready to accept more data. Pulse
width is approximately 11
11 BUSY 29
OUT HIGH indicates the printer cannot accept more
data.
12 PE 3 0
OUT HIGH indicates paper out. This signal is effective
only when the ERROR signal is LOW.
13 SLCT
OUT
Always HIGH output. (Pulled up to V through a
resistor.)
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