Appendix B: Parallel Interface; B-1. Interface Specifications; B-2. Interface Timing - Star SP200F SERIES User Manual

B-1. Interface Specifications

The operating specifications of the parallel interface are as follows.
(1) Data transfer rate
(2) Synchronization
(3) Handshaking
(4) Logic level

B-2. Interface Timing

ACK
Data
STROBE
BUSY
Signal Name
DATA 1-DATA 8
(To Printer)
STROBE
(To Printer)
BUSY, ACK
(From Printer)

Appendix B: Parallel Interface

: 1000 to 6000 characters per second
: Via externally supplied STROBE pulses
: ACK and BUSY signals
: Compatible with TTL level
Approx.9 µs
Fig. B-1 Interface timing diagram
Fig. B-2 Typical interface circuit
– 92 –
T T
T:more than 0.5 µs
Circuit Example
4.7KΩ
1KΩ
100Ω
470pF
1.8KΩ
T
74HC Compatible
74HC Compatible
74LS Compatible