1.5 Interfaces
The EPSON Stylus COLOR 800 is equipped with two interfaces: parallel and Mac serial interface, and a
card slot for an optional Type-B interface. This section provides information on each interface.
1.5.1 Parallel Interface (Forward Channel)
Transmission Mode
Synchronization
Handshaking
Signal Level
Table 1-14. Signal Level for TTL-Compatible IEEE-1284 Level 1 Device
Parameter
VOH*
VOL*
Notes: * A LOW logic level on the Logic H signal line is as follows:
Adaptable Connector
The BUSY signal is set HIGH before setting either /ERROR LOW or PE HIGH, and held HIGH until all
these signals return to an inactive state. The BUSY signal is HIGH in the following cases:
During data entry.
When the input data buffer is full.
While /INIT signal is at a LOW level or during hardware initialization.
During a printer error condition (See the /ERROR signal).
During test printing.
When the printer is in default setting mode.
When the parallel interface is not selected.
Rev. A
Download Service Manual and Resetter Printer at http://printer1.blogspot.com
8-bit parallel, IEEE-P1284 compatibility mode
/STROBE pulse
BUSY and /ACKNLG signal
TTL compatible level (IEEE-P1284 Level 1 device)
Refer to Table 1-15.
Minimum
—
–0.5 V
IOH*
—
IOL*
—
CO
—
VIH
—
VIL
0.8 V
IIH
—
IIL
—
CI
—
2.0 V or less when the printer is powered off.
3.0 V or more when the printer is powered on.
The receiver provides an impedance equivalent to 7.5K ohms to ground.
57-30360 (Amphenol) or equivalent
Maximum
Condition
5.5 V
—
0.32 mA
VOH = 2.4 V
12 mA
VOL = 0.4 V
50 pF
2.0 V
—
0.32 mA
VIH = 2.0 V
12 mA
VIL = 0.8 V
60 pF
Product Description
1-13