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BJC-5000
Reverse Req [Input]
This signal goes HIGH to LOW to perform a recovery process (data re-transmission)
during data transmission from the host computer to the printer. (Win 95 LPT. VXD
does not perform a recovery process.) In response to the falling edge of the Ack
Reverse (PE) signal, this signal goes LOW to HIGH. When switching from the idle
state of the forward data transmission phase to the reverse data transmission
phase, this signal goes HIGH to LOW (during data transmission from the printer to
the host computer).
Periph Req [Output]
If a reverse data transmission is requested by the printer during forward data
transmission, this signal goes HIGH to LOW. When the host computer switches
from forward data transmission to reverse data transmission, this signal goes LOW
to HIGH together with the Ack Reverse (PE) signal, in response to the falling edge of
the Reverse Req (INIT) signal which is a switching request from the host computer.
1284 Active [Input]
This signal goes LOW to HIGH when the negotiation phase starts. It remains HIGH
during the ECP mode to indicate that the operation is performed in the bi-
directional mode. To quit ECP, this signal goes HIGH to LOW to enter the
termination phase.
9) Timing
DATA 1 to 8
BUSY
STROBE
ACK
Figure 2-10 Timing Chart (Compatible Mode)
2-17
Part 2: Product Specifications
300ns
300ns
750ns-500 s
2.5 s
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