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Centronics Parallel Interface
A - 3
OL600e/610e/610e-PS/610e-S
Service Manual, P/N 59271602
4)
Signal Level
• LOW
:
0 V to +0.8 V
• HIGH
:
+2.4 V to 5.0 V
5)
Interface Circuit
a)
Receiving Circuit
b)
Sending Circuit
6)
Timing Charts
a)
Data Receiving Timing
b)
On-line
→
off-line switching timing by ON-LINE SW (HP4 emulation)
PARALLEL DATA
(DATA BITs 1 to 8)
DATA STROBE
ACKNOWLEDGE
BUSY
0.5
µ
s min.
0.5
µ
s min.
0.5
µ
s min.
0.5
µ
s max.
0.5
µ
s min.
0 min.
0 min.
0 min.
0.5
µ
s to 10
µ
s
0 min.
R = 3.3K
Ω
(1.0-K
Ω
STROBE)
+5V
R
(Open Collector)
+5V
3.3K
Ω
ON-LINE SW
BUSY
50 ms max.
SELECT