Interface; Parallel Interface (Forward Channel) - Epson Stylus Color 400 Service Manual

1.3 Interface

This printer provides parallel interface as standard.

1.3.1 Parallel Interface (Forward Channel)

[Transmission mode]
[Synchronization]
[Handshaking]
[Signal level]
[Adaptable connector]
BUSY signal is set high before setting either/ERROR low or PE high and held high until all these
signals return to their inactive state.
BUSY signal is at high level in the following cases.

During data entry (see Data transmission timing)

When input data buffer is full

During -INIT signal is at low level or during hardware initialization

During printer error (See /ERROR signal)
/ERROR signal is at low level when the printer is in one of the following states.

Printer hardware error (fatal error)

Paper-out error

Paper-jam error

Ink-out error
PE signal is at high level during paper-out error.
Table 1-9 shows the signal and connector pin assignments for parallel interface(forward channel*1).
In case of these signals, twist pair line is used and returning side is connected to signal GND.
(*1): Forward channel is the mode when the ordinary data such as an order to print is sent
from the PC to the printer.
Table 1-9. Signal and Connector Pin Assignment for Parallel Interface
Pin No. Signal Name
1 /STROBE
2-9 DATA0-7
10 /ACKNLG
11 BUSY
12 PE
13 SLCT
14 /AFXT
31 /INIT
32 /ERROR
36 /SLIN
18 Logic H
35 +5V
17 Chassis GND
16,33,19-30 GND
15,34 NC
Note) In/Out refers to the direction of signal flow from the printer's point of view.
Rev. A
: 8 bit parallel, IEEE-1284 compatibility mode
: By /STOPBE pulse
: BY BUSY and /ACKLG signal
: TTL compatible level
: 57-30360(amphenol) or equivalent
Return GND pin In/Out
19
20-27
28
29
28
28
30
30
29
30
-
-
-
-
-
EPSON Stylus Color 400 Service Manual
Functional Description
In The strobe pulse. Read-in of data is performed
at the falling edge of this pulse.
In The DATA0 through DATA7 signals represent
data bits 0 to 7, respectively. Each signal is at
high level when data is logical 1 and low level
when data is logical 0.
Out This signal is a negative pulse indicating that
the printer can again accept data.
Out A high signal indicates that the printer cannot
receive data.
Out A high signal indicates paper-out error.
Out Always at high level when the printer is
powered on.
In Not used.
In The falling edge of a negative pulse or a low
signal on this line causes the printer to
initialize. Minimum 50 us pulse is necessary.
Out A low signal indicates printer error condition.
In Not used.
Out Pulled up to +5V via 3.9K ohm resistor.
Out Pulled up to +5V via 3.3K ohm resistor.
- Chassis GND.
- Signal GND.
- Not connected.
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