Table of Contents
Advertisement
Part 2: Product Specifications
Nibble Mode
Host Clk [Input]
STROBE signal to read DATA 1 to DATA 8.
Negotiation phase:
Trigger signal to send the protocol confirmation to the printer.
DATA 1-8 [Input]
The printer receives data with the Host Clk signal.
The state of each bit of this signal must be maintained for at least 0.5 µs from the
rising edge of the Host Clk signal.
Ptr Clk [Output]
Reverse data transmission phase:
The printer requests the host computer to read the data by making the Ptr Clk
Signal Low. After finishing reading, the host computer notifies peripheral
equipment of completion of data receiving by making the Host Busy signal High.
Ptr Busy [Output]
Reverse data transmission phase:
Indicates bit 3 and bit 7 of the transmission data.
Ack Data Req [Output]
• Reverse data transmission phase:
Indicates bit 2 and bit 6 of the transmission data.
• Negotiation phase:
Trigger signal to inform the host computer of the printer's condition [whether it
supports nibble mode or not, whether there is reverse transmission data or not).
Xflag [Output]
• Reverse data transmission phase:
Indicates bit 1 and bit 5 of the transmission data.
• Negotiation phase:
Informs the host computer whether the printer supports nibble mode or not,
synchronizing with the falling edge of the Ack data Req signal. "L" means that it
supports nibble mode.
Host Busy [Input]
• Reverse data transmission phase:
Indicates that the host is ready to receive the data from the printer by making the
Host Busy signal Low. After that, it goes high to synchronize with the Low pulse of
Ptr Clk signal to verify receiving data.
• Reverse idle phase:
The Host Busy signal goes high in response to the Low pulse of the Ptr Clk signal,
and enters the reverse data transmission phase again.
lNIT [Input]
When this signal becomes "L," the printer's state becomes BUSY. When the signal
changes from "L" to "H," it resets the printer control system to the initial state.
This signal is normally "H" and the pulse width must be at least 0.5 µs at the
printer side.
After initializing, the printer enters compatible mode.
DataAvail [Output]
• Reverse data transmission phase:
Indicates bit 0 and bit 4 of the transmission data.
• Negotiation phase:
Informs the host computer if there is reverse transmission data or not to
synchronize with the falling edge of the Ack Data Req signal. "L" means that there
is reverse transmission data.
2-16
BJC-2000
BJC-2000
Advertisement
Table of Contents
