Epson FX-1180 - Impact Printer, Service Manual

Page: 26 / 156

Product Description
EPSON FX-880/FX-1180 Service Manual 1-15
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)
‰
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 1-23. Pin Assignments for Forward Channel
Pin Signal Return
GND Pin In/Out Functional Description
1 /STROBE 19 In Strobe pulse. Input data is latched at falling edge of
the signal.
2 to 9 DATA1 to 8 20 to 27 In Each signal, from bit 0 to bit 7, represents parallel
input data. HIGH means data 1; LOW means data 0.
10 /ACKNLG 28 Out This signal (negative pulse) indicates that the printer
has received data and is ready to accept more data.
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 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 /INIT 30 In This signal’s negative pulse initializes the printer.
32 /ERROR 29 Out This signal’s LOW level means the printer is in an
error state.
36 /SLIN 30 In This signal is always HIGH when printer power is ON.
18 Logic H

Out
This line is pulled up to +5 V through 3.9K
Ω
resistor.
35 +5V

Out
This line is pulled up to +5 V through 1.0K
Ω
resistor.
17 Chassis
 
Chassis GND.
16,33
19-30 GND
 
Signal GND.
15,34 NC
 
Not connected.
Note:
In/Out refers to the direction of signal flow from the printer’s point of view.