Interface Specifications; Parallel Interface (Forward Channel) - Epson FX-880 Service Manual

Interface Specifications

The FX-880 and FX-1180 provide a bidirectional 8-bit parallel interface and a Type-B optional interface slot
as standard.

Parallel Interface (Forward Channel)

Y
Transmission mode
Y
Adaptable connector
Y
Synchronization
Y
Handshaking
Y
Signal level
Pin Signal
1 /STROBE
2 to 9 DATA1 to 8
10 /ACKNLG
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
Note:
In/Out refers to the direction of signal flow from the printer's point of view.
EPSON FX-880/FX-1180 Service Manual
8 bit parallel, IEEE-1284 compatibility mode
57-30360 (AMPHENOL) or equivalent
/STROBE pulse
BUSY and /ACKNLG signals
TTL compatible (IEEE-1284 level 1 device)
Table 1-23. Pin Assignments for Forward Channel
Return In/Out
GND Pin
19 In
20 to 27 In
28 Out
29 Out
28 Out
28 Out
30 In
30 In
29 Out
30 In
Out
Out
Functional Description
Strobe pulse. Input data is latched at falling edge of
the signal.
Each signal, from bit 0 to bit 7, represents parallel
input data. HIGH means data 1; LOW means data 0.
This signal (negative pulse) indicates that the printer
has received data and is ready to accept more data.
This signal's HIGH level means that 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 the printer.
This signal's LOW level means the printer is in an
error state.
This signal is always HIGH when printer power is ON.
This line is pulled up to +5 V through 3.9K
This line is pulled up to +5 V through 1.0K
Chassis GND.
Signal GND.
Not connected.
Product Description
resistor.
resistor.
1-15