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.
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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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