Service manual

Product Description
Rev. A
1
5
1.3 Interfaces
1.3.1 Parallel Interface
1.3.1.1 Forward Channel Specifications
Transmission mode :8 bit parallel , IEEE-P1284 compatibility mode
Synchronization :/STROBE pulse
Handshaking :BUSY and /ACKNLG signal
Signal level :TTL compatible level (IEEE-P1284 Level 1 device)
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 - 60 pf
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 ohm top 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 0-8. 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)
Paper-out error
Paper-jam error
Ink-out error
The PE signal is high level during paper-out error.
Table 0-15. Signal level of TTL Compatible (IEEE-1284 level 1 device)
DATA (n)
DATA
BUSY
0.5 us (min.)
0 (min.)
0 (min.)
5 us (type.)
0 (min.)
DATA (n+1)
STORBE
ACKNLG
0.5 us (min.)
0.5 us (min.)
Figure 0-8. Data Transmission Timing