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
Y
Transmission mode
Y
Synchronization
Y
Handshaking
Y
Signal level
Y
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:
Y
During data entry
Y
When the input data buffer is full.
Y
While /INIT signal is at low level
Y
During hardware initialization
Y
During the signal /ERROR or PE is LOW or HIGH, respectively.
Y
During the self-test printing mode.
Y
During the default setting mode.
Y
During the adjustment mode.
The /ERROR signal is LOW when one of the following errors has occurred:
Y
Printer hardware error (fatal error)
Y
Paper-out error
The PE signal is HIGH when the following error has occurred:
Y
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