GENERAL DESCRIPTION
Rev. B 1-
1
9
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: 8-bit parallel, IEEE-1284 compatibility mode
 Synchronization: /STROBE pulse
 Connector type: 57-30360 (AMPHENOL) 36-pin plug or equivalent
 Handshaking: BUSY and /ACK 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: Refer to Figure 1-21.
Parameter M inimum Maximum Parameter Minimum Maximum
t setup 500 ns --- t ack 500 ns 10 us
t hold 500 ns --- t nbusy 0 ---
t stb 500 ns --- t next 0 ---
t ready 0 --- tt-out* --- 120 ns
t busy --- 500 ns tt-in** --- 200 ns
t reply --- ---
Note: * Rise and fall time of output signals
** Rise and fall time of input signals.
Figure 1-21. Data Transmission Timing
DATA
STROBE
BUSY
ACKNLG
t se tu p
t ready
t busy
t stb
t reply t ack t nbusy
t next
t hold
DATA (n) DATA (n+1)