Epson TM-300A Operator's Manual page 66

Signal Name Signal Direction
Pin Number
3 2
ERROR
33 GND
3 4 DRAWER
KICK-OUT
STATUS
3 5 + 5V
N C
3 6
NOTES: For interface wiring, be sure to use a twisted-pair cable for each
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signal and connect the return side to the signal GND level. To
prevent noise, these cables should be shielded and connected to
the chassis of the host computer.
All of the interface conditions are based on TTL levels. The rising
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time and falling time of any signal should be 0.2 µs or less.
Never transmit data without checking ACKNLG and BUSY. (Data
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should only be transmitted to this printer after confirming that
ACKNLG is active, or when BUSY is "LOW".)
The interface is cable should be as short as possible.
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3. Parallel interface timing chart
Receipt of data is controlled by the ACKNLG or BUSY signal. The BUSY signal,
goes "HIGH" depending on the receive buffer capacity as follows:
a) When the receive buffer capacity is
During data entry
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In the OFF-LINE state
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This signal indicates whether the printer
Output
is in an error state or not. This signal goes
"LOW" in the following cases.
• If the OFF-LINE state.
Signal ground
Output
Pulled to +5V through a 3.3 K
and the status signal of the drawer kick-out
connector is directly output.
This signal is pulled up to + + 5V through a
Output
3.3K resistor.
0
60
Function
resistor,