Interfaces; Parallel Interface (Forward Channel) - Epson DFX-8500 Service Manual

1.3 INTERFACES

The DFX-8500 is equipped with parallel interface, serial interface, and optional Type-B interface card.
This section presents the specifications for each interface type.

1.3.1 Parallel Interface (Forward channel)

‰
Data transmission mode:
‰
Synchronization:
‰
Connector type:
‰
Handshaking:
Notes 1: BUSY signal is set high before setting either /ERROR low or PE high and held high until
all these signals return to their inactive state. BUSY signal is at a high level in the following
cases.
„ During data entry (see data transmission timing)
„ When input data buffer is full.
„ During /INIT signal is at a low level or during hardware initialization
„ During printer error (see /ERROR signal)
„ During test printing or during setting printing
„ During SelecType
„ When the parallel interface is not selected.
Notes 2: /ERROR signal is at a low level when the printer is in one of the following states.
„ Printer hardware error (fatal error)
„ Paper out error
„ Paper jam error
„ Cover open status
„ Incomplete paper change
„ Paper size error
„ Ribbon jam error
Notes 3: PE signal is at a high level during paper out error.
‰
Data transmission timing:
Parameter Minimum
t setup
t hold
t stb
t ready
t busy
t reply
Note: * Rise and fall time of output signals
** Rise and fall time of input signals.
Rev. B
8-bit parallel, IEEE-1284 compatibility mode
/STROBE pulse
57-30360 (AMPHENOL) 36-pin plug or equivalent
BUSY and /ACK handshaking
Refer to Figure 1-21.
Maximum
500 ns ---
500 ns ---
500 ns ---
0 ---
--- 500 ns
--- ---
Figure 1-21. Data Transmission Timing
Parameter Minimum
500 ns
t ack
t nbusy 0
0
t next
tt-out* ---
tt-in** ---
GENERAL DESCRIPTION
Maximum
10 us
---
---
120 ns
200 ns
1-
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