Epson 2070 Service Manual - Page 30

Interface Specifications, Table 1-31 Pin Assignments for Forward Channel, Signal, Not connected.

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LQ-2070 Service Manual Product Description 1.3.2 Interface Specifications This printer provides a bidirectional 8-bit parallel interface and a Type B optional interface slot, standard. 1.3.2.1 Parallel Interface (Fotward Channel) q Transmission mode q Adaptable connector q Synchronization . Handshaking q Signal level 8-bit parallel, IEEE-P1284, compatibility mode 57-30360 (Amphenol) or equivalent STROBE P1.lk BUSY and ACI@lLG signals 'ITL compatible (IEEE-P1284 level 1. device) Table 1-31 Pin Assignments for Forward Channel Pin Signal Return No. Name GND pin 1 STROBE 19 2 DATA1 20 3 DATA2 21 4 DATA3 22 5 DATA4 23 6 DATA5 24 7 DATA6 25 8 DATA7 26 9 DATA8 27 10 ACKNLG 28 11 BUSY 29 , 12 PE 28 13 SLCT 28 14 AFXT 30 31 M 30 32 ERROR 29 36 SLIN 30 18 Logic H ---- 35 +5V ---- 17 Chassis ---- 16,33, 19-30 GND ---- 15,34 NC ---- In IOut In In In In In In In In In out out out out In In out In out Out --- ----- Function Description Strobe pulse. Input data is latched at falling edge of the signal Parallel input data to the printer bit O: LSB bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7: MSB This signal (negative pulse) indicates the printer has received data and is ready to accept more data. This signal's HIGH level means the printer is not ready to accept data. This signal's HIGH level means the printer has a paper-out error. Always HIGH when the printer is powered on. Not used. This signal's negative pulse initializes printer. This signal's LOW level means the printer is in an error state. Not used. This line is pulled up to + 5 V through 3.9KQ resistor. This line is pulled up to +5 V through 3.3KQ resistor. Chassis GND. Signal GND. Not connected. Rev.A 1-21

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LQ-2070
Service Manual
Product Description
1.3.2 Interface Specifications
This
printer provides a bidirectional 8-bit parallel interface and a Type B optional interface slot,
standard.
1.3.2.1 Parallel Interface
(Fotward
Channel)
Transmission mode
8-bit parallel,
IEEE-P1284,
compatibility mode
Adaptable connector
57-30360
(Amphenol)
or equivalent
Synchronization
STROBE
P1.lk
. Handshaking
BUSY and
ACI@lLG
signals
Signal level
‘ITL
compatible
(IEEE-P1284
level
1.
device)
Table 1-31 Pin Assignments for Forward Channel
Pin
Signal
Return
No.
Name
GND
pin
In
IOut
Function Description
1
STROBE
19
In
Strobe pulse. Input data is latched at falling edge of the signal
2
DATA1
20
In
Parallel input data to the printer
bit O: LSB
3
DATA2
21
In
bit
1
4
DATA3
22
In
bit 2
5
DATA4
23
In
bit 3
6
DATA5
24
In
bit 4
7
DATA6
25
In
bit 5
8
DATA7
26
In
bit 6
9
DATA8
27
In
bit 7: MSB
10
ACKNLG
28
out
This signal (negative pulse) indicates the printer has received
data and is ready to accept more data.
11
BUSY
29
out
This signal’s HIGH level means the printer is not ready to
accept data.
, 12
PE
28
out
This signal’s HIGH level means the printer has a paper-out
error.
13
SLCT
28
out
Always HIGH when the printer is powered on.
14
AFXT
30
In
Not used.
31
M
30
In
This signal’s negative pulse initializes printer.
32
ERROR
29
out
This signal’s LOW level means the printer is in an error state.
36
SLIN
30
In
Not used.
18
Logic H
----
out
This line is pulled up to + 5 V through
3.9KQ
resistor.
35
+5V
----
Out
This line is pulled up to +5 V through
3.3KQ
resistor.
17
Chassis
----
-–-
Chassis
GND.
16,33,
GND
----
---
Signal
GND.
19-30
15,34
NC
----
---
Not connected.
Rev.A
1-21