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Data Transmission Timing
C-6 User’s Manual
The 6400 Pro/6600 Pro uses a bi-directional parallel interface
complying with IEEE 1284. This interface is also compatible with the
conventional Centronics interface. Data transfer from host to print is
performed according to Centronics standard, called compatible mode.
Data transfer from printer to host, it is performed according to the
IEEE 1284 standard, called nibble mode.
In compatible mode, the printer receives data from the computer in
handshaking mode based on the Busy and Acknowledge
signals from
the printer and the Data Strobe
signal from the computer. For the Data
Strobe and Acknowledge signals, the timing of the Busy signal must be
as shown in Figure C-1.
To send data from the printer to the host, the interface enters the
nibble mode where data is sent in units of four bits (nibble) using the
four output signal lines as data paths. The data transfer sequence in
nibble mode involves negotiation phase, reverse idle phase, reverse data
transfer phase, and termination phase. Figure C-2 shows the reverse
data transfer phase where data is sent.
Compatible mode (data transfer from host to printer):
Figure C–1 Data transmission timing
Data
Transmission
Timing
Data Strobe
BUSY
Data 1 to Data 8
Acknowledge
T1, T2, T3 > 1 µs
T4 < 1 µs
0 µs< T5 < 3 µs
2 µs< T6 < 6 µs
T4
T1 T2 T3
T5
T6
DL6400/6600 Book Page 6 Thursday, September 21, 2000 7:52 PM