Interfaces; Parallel Interface - Epson DLQ-3000+ Service Manual

DLQ-3000+

1.4 Interfaces

The EPSON DLQ-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


Synchronization


Handshaking


Signal level


Adaptable connector
Table 1-23. Signal level of TTL Compatible (IEEE-1284 level 1 device)
Parameter
VOH*
VOL*
IOH*
IOL*
CO
VIH
VIL
IIH
IIL
CI


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 HIGH in the following cases:


During data entry


When the input data buffer is full.


While /INIT signal is at low level


During hardware initialization


During the signal /ERROR or PE is LOW or HIGH, respectively.


During the self-test printing mode.


During the default setting mode.


During the adjustment mode.
The /ERROR signal is LOW when one of the following errors has occurred:


Printer hardware error (fatal error)


Paper-out error
The PE signal is HIGH when the following error has occurred:


Paper-out error
1-28
8 bit parallel, IEEE-1284 compatibility mode
By /STROBE pulse
By /BUSY and /ACKNLG signal
TTL compatible (IEEE-1284 level 1 device)
57-30360 (Amphenol) or equivalent
Minimum
-
-0.5 V
-
-
-
-
0.8 V
-
-
-
Maximum
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
50 pf
Condition
Rev. A