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BJC-5000
Ptr Clk [Output]
Reverse data transmission phase:
The printer requests the host computer to read the data after the Ptr Clk signal
goes HIGH to LOW. After reading the data, the host computer notifies the printer of
completion of data receiving by making the Host Busy signal go LOW to HIGH.
Ptr Busy [Output]
Reverse data transmission phase:
Used for bit 3 and bit 7 of the transmission data.
Ack Data Req [Output]
• Reverse data transmission phase:
Used for bit 2 and bit 6 of the transmission data.
• Negotiation phase:
Used for the trigger signal to inform the host computer of the printer conditions
(whether it supports the nibble mode or not, whether the reverse transmission
data is present or not, etc.).
Xflag [Output]
• Reverse data transmission phase:
Used for bit 1 and bit 5 of the transmission data.
• Negotiation phase:
Informs the host computer whether the printer supports the nibble mode or not.
Indicates that the printer supports nibble mode when this signal is LOW,
synchronizing with the leading edge of the Ack Data Req signal.
Host Busy [Input]
• Reverse data transmission phase:
Indicates that the host computer is already receiving data from the printer when
this signal is LOW. After that, when the Ptr Clk signal in the received data goes
HIGH to LOW, this signal synchronizes with the Ptr Clk signal and goes to HIGH.
• Reverse standby phase:
This signal goes LOW to HIGH after the Ptr Clk signal goes HIGH to LOW, and
enters the reverse data transmission phase again.
INIT [Input]
When this signal goes HIGH to LOW, the printer is put in the BUSY status and
reset after INIT goes LOW to HIGH. This signal is normally HIGH and the pulse
width must be at least 0.5 µs at the printer side.
DataAvail [Output]
• Reverse data transmission phase:
Used for bit 0 and bit 4 of the transmission data.
• Negotiation phase:
Informs the host computer whether there is reverse transmission data or not.
Synchronizes with the falling edge of the LOW pulse of the Ack Data Req signal
which is the timing indicating that there is reverse transmission data.
1284 Active [Input]
This signal confirms whether the printer is a 1284-compatible device when this
signal is HIGH and the Host Busy signal is LOW. It goes HIGH to LOW with the
termination phase.
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Part 2: Product Specifications
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