Epson 890N Service Manual - Page 23

Interface, Parallel interface (Forward channel)

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EPSON FX-890/2190 1.2 Interface This printer provides bi-directional 8-bit parallel interface, USB interface and Type-B optional interface slot as standard. 1.2.1 Parallel interface (Forward channel) † Specifications „ Transmission mode: 8 bit parallel, IEEE-1284 compatibility mode „ Adaptable connector: 57-30360 (Amphenol) or equivalent „ Synchronization: -STROBE pulse „ Handshaking : BUSY and -ACKNLG signals „ Signal level: TTL compatible (IEEE-1284 level 1 device) Table 1-25. Connector pin assignment (Forward channel) Pin No. Signal Name Return GND Pin IN/ Out* 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 0: 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 This signal (negative pulse) indicates that the Out printer has received data and is ready to accept next one. 11 BUSY 29 Out This signal's high level means that the printer is not ready to accept data. Revision B Table 1-25. Connector pin assignment (Forward channel) (continued) Pin No. Signal Name Return GND Pin IN/ Out* Function description 12 PE 28 Out This signal's high level means that the printer is in a state of paper-out error. 13 SLCT 28 Out Always at high level when the power to the printer is on. 14 -AFXT 30 In Not used. 31 -INIT 30 In This signal's negative pulse initializes printer. 32 -ERROR 29 Out This signal's low level means the printer is in a state of error. 36 -SLIN 30 In Not used. 18 Logic H - Out This line is pulled up to +5 V through 3.9 kΩ resistor. 35 +5 V - Out This line is pulled up to +5 V through 1.0 kΩ resistor. 17 Chassis - - Chassis GND. 16, 33 GND - - Signal GND. 19-30 15, 34 NC - - Not connected. Note : In/Out shows the direction of signal flow from the printer's point of view. PRODUCT DESCRIPTIONS Interface 23

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EPSON FX-890/2190
Revision B
PRODUCT DESCRIPTIONS
Interface
23
1.2
Interface
This printer provides bi-directional 8-bit parallel interface, USB interface and Type-B
optional interface slot as standard.
1.2.1
Parallel interface (Forward channel)
Specifications
Transmission mode:
8 bit parallel, IEEE-1284 compatibility mode
Adaptable connector:
57-30360 (Amphenol) or equivalent
Synchronization:
-STROBE pulse
Handshaking:
BUSY and -ACKNLG signals
Signal level:
TTL compatible (IEEE-1284 level 1 device)
Note : In/Out shows the direction of signal flow from the printer’s point of view.
Table 1-25.
Connector pin assignment (Forward channel)
Pin
No.
Signal
Name
Return
GND
Pin
IN/
Out*
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 0: 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 that the
printer has received data and is ready to accept next
one.
11
BUSY
29
Out
This signal’s high level means that the printer is not
ready to accept data.
12
PE
28
Out
This signal’s high level means that the printer is in
a state of paper-out error.
13
SLCT
28
Out
Always at high level when the power to the printer
is on.
14
-AFXT
30
In
Not used.
31
-INIT
30
In
This signal’s negative pulse initializes printer.
32
-ERROR
29
Out
This signal’s low level means the printer is in a
state of error.
36
-SLIN
30
In
Not used.
18
Logic H
-
Out
This line is pulled up to +5 V through 3.9 k
Ω
resistor.
35
+5 V
-
Out
This line is pulled up to +5 V through 1.0 k
Ω
resistor.
17
Chassis
-
-
Chassis GND.
16, 33
19-30
GND
-
-
Signal GND.
15, 34
NC
-
-
Not connected.
Table 1-25.
Connector pin assignment (Forward channel)
(continued)
Pin
No.
Signal
Name
Return
GND
Pin
IN/
Out*
Function description