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D-6 Manual del Usuario
INFORMACION DE LA INTERFAZ
Sincronización de la Transmisión de Datos
En modo unidireccional (interfaz Centronics convencional), esta
impresora garantiza los datos recibidos cuando las señales Data y
Data Strobe procedentes del ordenador se producen en los momentos
siguientes en relación con las señales Busy y Acknowledge proceden-
tes de la impresora.
En modo bidireccional (modo nibble) esta impresora puede enviar
datos al ordenador. Los datos se envían en unidades de 4 bitios
(nibble) empleando 4 líneas de señales de salida como rutas de datos.
A continuación se resalta un bitio de datos enviado durante la fase de
transferencia de datos invertidos en modo nibble.
Data Available (*)
X Flag
Ack Data Req
Printer Busy
Host Busy
(from CPU)
Printer Clock
Data bit 4
Data bit 5
Data bit 6
Data bit 7
Data bit 0
Data bit 1
Data bit 2
Data bit 3
1284 Active
(from CPU)
* Data Available is assigned for the cable.
T1, T2, T3 > 1 µs
T4 < 1 µs
0 µs < T5 < 3 µs
T1
T3
T2
T4
T5 T6
BUSY
Data 1 to Data 8
Data Strobe
Acknowledge
018APPXD.P65 12.08.1998, 10:11 Uhr6
235


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