Init [Input]
When it changes to Low, this signal sets the printer in the BUSY state, then resets
the printer by changing from Low to High.
The pules width of this signal is requiired longer than 5 micro seconds.
On completion of initialization, the head retreats to the home position and the
default print mode is selected.
Fault [Output]
This signal changes to Low when the printer detects an error and when the carriage
is in the cartridge replacement position to inform the host computer of the error
state.
Select in [Input]
This signal is only used for the transition from compatible mode to negotiation mode.
Nibble Mode
HostClk [Input]
This is the STROBE signal to read DATA 1 to DATA 8. When in negotiation phase
this is the trigger signal to send the protocol confirmation to the printer.
In nibble mode, this signal is always High so that the printer does not fetch data.
Data 1 to 8 [Input]
The data bus is not used in nibble mode.
Ptr Clk [Output]
The printer requests the host computer to read the data by making the Ptr Clk
signal Low in the reverse data transmission phase. After finishing reading, the host
computer notifies the printer of completion of data receiving by making the Host
Busy AUTO FEED XT signal High.
Ptr Busy [Output]
This signal outputs the data to be sent to the host computer in the reverse data
transmission phase. First, bit 3 of the transmission byte data is output, followed by
bit 7.
Ack Data Req [Output]
This signal outputs the data to be sent to the host computer in the reverse data
transmission phase. First, bit 2 of the transmission byte data is output, followed by
bit 6.
This signal is used as the trigger signal to inform the host computer of the printer’s
condition in the negotiation phase.
Xflag [Output]
This signal outputs the data to be sent to the host computer in the reverse data
transmission phase. First, bit 1 of the transmission data is output, followed by bit
5.
This signal informs the host computer whether the printer supports nibble mode in
the negotiation phase.
The printer supports nibble mode when this signal level changes to Low at the same
time the Ack Data Req (PE) signal rises.
2-15
BJC-7100
Part 2: Product Specifications
