Parallel Interface - Epson Stylus Pro 9000 Service Manual

EPSON Stylus Pro 9000

PARALLEL INTERFACE

Table 1-27. Parallel Interface - Compatibility Mode
Item
Transmission mode 8-bit parallel, IEEE-1284 compatibility mode
Synchronization By STROBE pulse
Handshaking By BUSY and ACKNLG signal
TTL compatible level (IEEE-1284 Level 1 device)
Logic Level
57-30360 (Amphenol) or equivalent 36-pin
Connector
Note 1: Use a twisted-pair cable.
Note 2: The BUSY signal is set high before setting the -ERROR signal low or the PE
signal high. The BUSY signal remains high until all these signals return to their normal
state.
The BUSY signal is high:
n
During data entry
n
When the input data buffer is full
n
When the -INIT signal is low, or during hardware initialization
n
During a printer error
n
When the parallel interface is not selected
The ERROR signal is low when there is a:
n
Printer hardware error (fatal error)
n
Paper-out error
n
Paper-jam error
n
Ink-out error
NOTE: The PE signal is high during a paper-out error.
Product Description
Description
Interfaces
Table 1-28. Connector Pin Assignments - Forward Channel
Pin Signal Return In/
No. Name Pin Out
Data reception pulse, 0.5uS or greater pulse width
1 STROBE 19 I required. Usual state is HIGH, and reads data after
going to LOW state.
The DATA0 through DATA7 signals represent data bits
0 to7, respectively. Each signal is at high level when
DATA0~7 data is logical 1 and low level when data is logical 0.
2-9 20-27 I
These signals are used to transfer the 1284 extensibility
request values to the printer.
When LOW the printer has finished preparing to receive
ACKNLG signals and can accept data. Pulse width is about 1uS or
10 28 O
3uS Printer clock signal.
HIGH means the printer cannot receive data. This
11 BUSY 29 O occurs when the printer is receiving data or when the
printer is in an error state.
12 PE 28 O HIGH means no paper is loaded. (LOW means an error.)
SLCT Always HIGH. Pulled up to +5V via 1.0Kohm
13 28 O
AFXT Not used
14 30 I
15 NC Not connected
GND Ground for twisted pair return
16
Chassis Ground for frame/body
17
18 Logic H Pulled up to +5V via 3.9Kohm
GND Ground for twisted pair return
19-30
Pulse width of 50uS or more means LOW pulse, and the
31 -INIT 30 I
falling edge of LOW signal causes the printer to initialize.
32 ERROR 29 O LOW means printer error
GND Ground for twisted pair return
33 ---- ----
NC Not connected
34 ---- ----
HIGH during normal operation. Pulled up to +5V via
+5V
35 ---- O
1.0Kohm
SLCTIN Not used
36 30 I
Note: "In/Out" is signal direction as viewed from printer.
The interface condition is normally TTL Level, and each high/low signal takes 0.2uS or less.
The printer only sends data after receiving the ACKNLG confirmation or when the BUSY signal
is low.
Revision B
Functional Description
29