Interface information, Data transmission timing, User's manual d-6 – FUJITSU DL3750+/3850+ User Manual

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User's Manual

D-6

INTERFACE INFORMATION

Data Transmission Timing

In unidirectional mode (conventional Centronics interface), this printer

guarantees the received data when the Data and Data Strobe signals from the

computer have the following timing with respect to the Busy and Acknowledge

signals from the printer.

➤

T1, T2, T3 > 1 µs
T4 < 1 µs
0 µs < T5 < 3 µs
2 µs < T6 < 6 µs

Data 1 to Data 8

Data Strobe

BUSY

Acknowledge

In bidirectional mode (nibblemode), this printer can send data to the compu-

ter. Data is sent in units of four bits (nibble) using four output signal lines as

data paths. The following outlines one byte of data sent during reverse data

transfer phase in nibble mode.

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.