Interface Specifications; Parallel Interface (Forward Channel) - Epson FX-2170 Service Manual

FX-2170 Service Manual

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 (Forward Channel)

Transmission mode
Adaptable connector
Synchronization
Handshaking
Signal level
Table 1-31 Pin Assignments for Forward Channel
Pin Signal
No. Name GND pin
1 STROBE
2 DATA1
3 DATA2
4 DATA3
5 DATA4
6 DATA5
7 DATA6
8 DATA7
9 DATA8
ACKNLG
10
11 BUSY
12 PE
13 SLCT
14 AFXT
31 INIT
32 ERROR
36 SLIN
18 Logic H
35 +5V
17 Chassis
16, 33,
GND
19-30
15, 34 NC
Rev.A
8-bit parallel, IEEE-P1284, compatibility mode
57-30360 (Amphenol) or equivalent
STROBE pulse
BUSY and ACKNLG signals
TTL compatible (IEEE-P1284 level 1 device)
Return
In /Out
19 In
20 In
21 In
22 In
23 In
24 In
25 In
26 In
27 In
28 Out
29 Out
28 Out
28 Out
30 In
30 In
29 Out
30 In
—— Out
—— Out
—— ——
—— ——
—— ——
Function Description
Strobe pulse. Input data is latched at falling edge of the signal
Parallel input data to the printer
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 3.3K resistor.
This line is pulled up to +5 V through 3.3K resistor.
Chassis GND.
Signal GND.
Not connected.
Product Description
bit 0: LSB
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7: MSB
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