Appendix b:parallel interface, B-1. interface specifications, B-2. interface timing – Star Micronics SP200F User Manual
Page 95: Appendix b: parallel interface
Advertising
– 92 –
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
Advertising