Citizen Systems CBM920II user manual Description of Input/Output Signals

5.3Description of Input/Output Signals

(1)Input signal

• DATA 1 to DATA 8 . . . 8 bit parallel signal (positive logic)

• STB . . . Strobe signal for reading out data (negative logic)

• RESET . . . Signal for resetting the entire unit (negative logic 4 ms or more)

(2)Output signal

• ACK . . . 8 bit data signal for requesting data. ACK is issued at the end of the BUSY signal (negative logic)

• BUSY . . . Signal indicating the printer is busy. Input new data when the signal is in “LOW” condition (positive logic)

• PE . . .Signal that shows form cutting (positive logic)

• FAULT. . . . Signal that shows that trouble like mechanism alarm etc. occurred

(3)Other

• GND . . . Ground commonly used in the circuit

• FRAME GND . . . Frame ground (case ground)

(4)Timing chart

Busy signal timing: Clear timing can be selected by the memory switch.

ACK signal timing: The following kinds of timing can be selected by the memory switch setting.

POWER			DATA	DATA	DATA	T1: 2.0us MIN
DATA
						T2: 500ms MIN
						T3: 5us TYP
	STB
		T2		T1

BUSY

ACK

T3

Busy signal timing: Clear timing can be selected by the memory switch.

ACK signal timing: The following kinds of timing can be selected by the memory switch setting.

BUSY

Before

ACK

BUSY

Center

ACK

BUSY

After

ACK

T5

	T4: 5us TYP
T4	T5: 5us TYP

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