Epson LQ 870 User Manual - Page 123

Interface Specifications, Specifications and Pin Assignments, Technical Specifications

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Interface Specifications Your printer is equipped with a parallel interface Specifications and pin assignments The built-in parallel interface has the following characteristics: Data format: B-bit parallel Synchronization: STROBE pulse Handshake timing: BUSY and ACKNLG signals Signal level: TTL compatible level Connector: 36-pin 57-30360 Amphenol connector or equivalent Connector pin assignments and a description of their respective interface signals are shown in the following table. Signal Return Pin Pin 1 19 2 20 3 21 4 22 5 23 6 24 7 25 8 26 9 27 10 28 Signal Direction Description STROBE in DATA 1 IN DATA 2 IN DATA 3 IN DATA 4 IN DATA 5 IN DATA 6 IN DATA 7 IN DATA 8 IN ACKNLG OUT STROBE pulse to read data. Pulse width must be more than 0.5 microseconds at the receiving terminal. These signarelspreseintformation of the 1st to 8th bits of parallel data, respectively. Each signal is at HIGH level when data is logical 1 and LOW when it is logical 0. About an 1 l-microsecond pulse. LOW indicates that data has been received and that the printer is ready to accept more data. 7-10 Technical Specifications

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Interface Specifications
Your printer is equipped with a parallel interface
Specifications and pin assignments
The built-in parallel interface has the following characteristics:
Data format:
B-bit parallel
Synchronization:
STROBE pulse
Handshake timing:
BUSY and ACKNLG signals
Signal level:
TTL compatible level
Connector:
36-pin 57-30360 Amphenol connector or
equivalent
Connector pin assignments and a description of their respective
interface signals are shown in the following table.
Signal Return
Pin
Pin
Signal
Direction
Description
1
19
STROBE
in
STROBE pulse to read data. Pulse width
must be more than 0.5 microseconds at
the receiving terminal.
2
20
DATA
1
IN
These
signals
information
of
represent
3
21
DATA
2
IN
the 1st to 8th bits of parallel data,
4
22
DATA
3
IN
respectively. Each signal is at HIGH level
5
23
DATA 4
IN
when data is logical
1
and LOW when
it
6
24
DATA 5
IN
is logical 0.
7
25
DATA 6
IN
8
26
DATA 7
IN
9
27
DATA 8
IN
10
28
ACKNLG
OUT
About an 1 l-microsecond pulse.
LOW indicates that data has been
received and that the printer is ready to
accept more data.
7-10
Technical Specifications