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APPENDIX
Appendix B: Parallel Interface
B-1. Interface Specifications
The operating specifications of the parallel interface are as follows.
(1) Data transfer rate
:
1000 to 6000 characters per second
(2) Synchronization
:
Via externally supplied STROBE pulses
(3) Handshaking
:
ACK and BUSY signals
(4) Logic level
:
Compatible with TTL level
B-2. Interface Timing
Fig. B-1 Interface timing diagram
Signal Name
Circuit Example
DATA 1-DATA 8
(To Printer)
STROBE
(To Printer)
BUSY, ACK
(From Printer)
Fig. B-2 Typical interface circuit
ACK
Approx.9
µ
s
Data
STROBE
BUSY
T
T
T
T:more than 0.5
µ
s
74HC Compatible
4.7K
Ω
100
Ω
470pF
74HC Compatible
1K
Ω
1.8K
Ω
74LS Compatible
INPUT
OUTPUT
Содержание SP200F SERIES
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Страница 108: ...104 APPENDIX Appendix E Character Font Table E 1 U S A...
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Страница 110: ...106 APPENDIX E 2 Europe 1 represents where the character code 05 H becomes control code ENQ for the RS 422A interface...
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Страница 112: ...108 APPENDIX E 3 International Character Sets...
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