Interfaces; Parallel Interface; Forward Channel Specifications - Epson Stylus Color 1520 Service Manual
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Also See for Stylus Color 1520:
- User manual (290 pages) ,
- Service manual (165 pages) ,
- Quick setup manual (21 pages)
Table of Contents
1.3 Interfaces
1.3.1 Parallel Interface
1.3.1.1 Forward Channel Specifications
Transmission mode
Synchronization
Handshaking
Signal level
Table 1-15. Signal level of TTL Compatible (IEEE-1284 level 1 device)
Parameter
VOH*
VOL*
IOH*
IOL*
CO
VIH
VIL
IIH
IIL
CI
Note) * 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 shall provide an impedance equivalent to 7.5 K ohms to ground.
Adaptable connector :57-30360 (Amphenol) or equivalent
The BUSY signal is set high before setting either /ERROR low or PE high and held high until all these
signals return to the inactive state.
The BUSY signal is at high level in the following cases:
During data entry (see Figure 1-8. Data Transmission Timing below.)
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 at low level when one of the following errors has occurred:
Printer hardware error (fatal error)
8 bit parallel , IEEE-P1284 compatibility mode
/STROBE pulse
BUSY and /ACKNLG signal
TTL compatible level (IEEE-P1284 Level 1 device)
Minimum
-
-0.5 V
-
-
-
-
0.8 V
-
-
-
DATA
DATA ( n )
STROBE
0.5 us (min.)
0.5 us (min.)
BUSY
ACKNLG
Figure 1-8. Data Transmission Timing
Maximum
5.5 V
-
0.32 mA
12 mA
50 pf
2.0 V
-
0.32 mA
12 mA
60 pf
DATA ( n+1 )
0.5 us (min.)
0 (min.)
0 (min.)
5 us (type.)
0 (min.)
Product Description
Condition
VOH = 2.4 V
VOL = 0.4 V
VIH = 2.0 V
VIL = 0.8 V
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