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5
Interface
D
Interface switching
Two interfaces are provided, an 8 —bit parallel Centronics interface
and RS—232C interface. These interfaces are automatically switched. The in
terface that receives a signal first after the power is turned on is selected.
8—bit parallel interface (conformable to Centronics)
2)
O) Control signal
ST B
Input/output
DATA 1
S TB
BUSY
ACK
ERROR
Timing chart
0 vs or more
DATA
S TB
or less
0.1
BUSY
ACK
ACK
BUSY
circuit configuration and input/output condition
4. 7k Q
74 HC
o
1000
1500 PF
7406
4. 7kQ
0.5gs or more
Data holding time
0 .5gs or more
ERROR
logic level
Input/output
132
o —1.35 v
Output
logic level
0. vs or more
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