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

Page 95: Appendix b: parallel interface

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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

See also other documents in the category Star Micronics Printers: