Parallel Interface Forward channel

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)

■ 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.

DATA

STROBE

t setup

BUSY

ACKNLG

t ready t hold t stb t busy t reply t ack t next t nbusy

t reply t ack t nbusy

Parameter

Minimum

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.

Note: * Rise and fall time of output signals ** Rise and fall time of input signals.

Figure 1-21. Data Transmission Timing

□ Signal Level: TTL-level compatible, IEEE-1284 level 1 device

Refer to Table 1-9.

Table 1-9. Sig

nal Level

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 = 2.4 V

IIL

-

12 mA

VIL = 0.8 V

CI

-

50 pF

Note: * A low logic level on the logical high signal is 2.0 V or less when the printer is powered off. And this signal is equal or exceeding 3. 0 V when the printer is powered on. The receiver shall provide an impedance equivalent to 7.5 K ohms to ground.

□ Connector pin assignments and signals: Refer to Table 1-10.

Table 1-10. Signal and Connector Pin Assignment (Forward channel)

Pin No.

Signal Name

Return GND pin

In/Out*

Functional Description

1

/STROBE

19

In

The strobe pulse. Read-in of data is performed at the falling edge of this pulse.

2-9

DATA 0-7

20-27

In

The DATA0 through DATA7 signals represent data bits 0 to 7, respectively. Each signal is at high level when data is logical 1 and low level when data is logical 0.

10

/ACKNLG

28

Out

This signal is a negative pulse indicating that the printer can again accept data.

11

BUSY

29

Out

A high signal indicates that the printer cannot receive data.

12

PE

28

Out

A high signal indicates paper-out error.

13

SLCT

28

Out

Always at high level when the printer is powered on.

14

/AFXT

30

In

Not used.

31

/INIT

30

In

The falling edge of a negative pulse or a low signal on this line causes the printer to initialize. Minimum 50 us pulse is necessary.

32

/ERROR

29

Out

A low signal indicates printer error condition.

36

/SLIN

30

In

Not used.

18

Logic H

-

Out

Pulled up to +5V via 3.9K ohm resistor.

35

+5V

-

Out

Pulled up to +5V via 3.3K ohm resistor.

17

Chassis GND

-

-

Chassis GND.

16,33,19,30

GND

-

-

Signal GND.

15,34

NC

-

-

Not connected.

Note: * In/Out refers to the direction of signal flow from the printer's point of view.

Note: * In/Out refers to the direction of signal flow from the printer's point of view.

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