Specifications

2-26 Hardware
Confidential
NOTES:
1. When the DIP switch 1-2 is Off (the receive buffer capacity is specified to 45 bytes): When the remaining space in
the receive buffer drops to 16 bytes, the printer status becomes “buffer full” and it remains “buffer full” until the
space in the receive buffer increases to 26 bytes.
2. When the DIP switch 1-2 is On (the receive buffer capacity is specified to 4K bytes): When the remaining space in
the receive buffer drops to 128 bytes, the printer status becomes “buffer full” and it remains “buffer full” until the
space in the receive buffer increases to 256 bytes.
3.The printer ignores the data received when the remaining space in the receive buffer is 0 bytes.
Electrical characteristics
** No guarantee is offered to V
OL
and I
OL
while the power is OFF.
DC characteristics (except logic-H, +5 V signals)
Characteristics Symbol
Specifications
ConditionsMin Max
Output HIGH voltage V
OH
*2.4 V 5.5 V *I
OH
=0.32 mA
Output LOW voltage V
OL
–0.5 V *0.4 V *I
OL
=-12 mA
Output HIGH current I
OH
0.32 mA — V
OH
=0.32 V
Output LOW current I
OL
–12 mA — V
OL
=0.4 V
Input HIGH voltage V
IH
2.0 V —
Input LOW voltage V
IL
— 0.8 V
Input HIGH current V
IH
— –0.32 mA V
IH
=2.0 V
Input LOW current V
IL
— 12 mA V
IL
=0.8 V
Logic-H signal sender characteristics
Characteristics Symbol
Specifications
Conditions Min Max
Output HIGH voltage V
OH
3.0 V 5.5 V
Output LOW voltage V
OL
— 2.0 V While the power is OFF
+5 V signal sender characteristics
Characteristics Symbol
Specifications
ConditionsMin Max
Output HIGH voltage V
OH
*2.4 V 5.5 V *IOH=0.32 mA
Output LOW voltage V
OL
— — ** While the power is OFF
Output HIGH current I
OH
— 0.32 mA VOH=2.4 V
Output LOW current I
OL
— ** — While the power is OFF