Epson Stylus COLOR 3000, Руководство по обслуживанию, Страница: 23 / 180

Product Descriptions
Rev. A
1-16
1.4 Interfaces
The EPSON Stylus COLOR 3000 is equipped with the parallel and Mac serial interfaces and a card slot
for an optional Type-B interface. This section provides information on each interface.
1.4.1 Parallel Interface
Forward Channel
Transmission mode 8 bit parallel, IEEE-1284 compatibility mode
Synchronization By /STROBE pulse
Handshaking By /BUSY and /ACKNLG signal
Signal level TTL compatible
Adaptable connector 57-30360 (Amphenol) or equivalent
Parameter Minimum Maximum Condition
VOH* - 5.5 V
VOL* -0.5 V -
IOH* - 0.32 mA VOH = 2.4 V
IOL* - 12 mA VOL = 0.4 V
CO - 50 pf
VIH - 2.0 V
VIL 0.8 V -
IIH - 0.32 mA VIH = 2.0 V
IIL - 12 mA VIL = 0.8 V
CI - 50 pf
∗
A LOW logic level on the Logic H signal is as follows:
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 7.5 K ohms to ground.
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 low level or during hardware initialization.
During a printer error condition (See /ERROR signal).
During test printing.
When the printer is in default setting mode.
When the parallel interface is not selected.
The /ERROR signal is LOW when one of the following errors has occurred:
Printer hardware error (fatal error)
Paper-out error
Paper-jam error
Ink-out error
The PE signal is high level during paper-out error.
Table 1-19. Signal level of TTL Compatible (IEEE-1284 level 1 device)