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Part 2: Product Specifications
8) Input/output signals
Compatible Mode
STROBE [Input]
This signal is used to read Data1 to Data8. This signal becomes valid after the
BUSY signal goes from HIGH to LOW and the printer outputs an ACKNLG signal.
This signal is normally HIGH and the printer receives data after the signal goes
LOW.
DATA1 to 8 [Input]
The printer receives data on the STROBE signal. The status of each bit of this
signal must be maintained for at least 280 ns from the leading edge of the STROBE
signal.
ACKNLG [Output]
This signal is a response signal to the STROBE signal. The host computer cannot
output the next STROBE signal until this signal is output. When the power is
turned on or when the BUSY goes from HIGH to LOW for the input of the INIT
signal, this signal is sent regardless of the STROBE signal.
BUSY [Output]
When this signal is HIGH, the printer is BUSY; when it is LOW, the printer is
READY. This signal goes from LOW to HIGH when data is received or when an error
occurs (paper-out, paper jam).
P.E. [Output]
If the printer is unable to feed paper even when the feeding operation is executed by
the printer, this signal goes from LOW to HIGH. At this time, the BUSY signal goes
HIGH and the SELECT and ERROR signals go LOW. The signal goes LOW when the
paper is set and fed. At this time, the ERROR and SELECT signals go from LOW to
HIGH.
SELECT [Output]
When the printer is READY, this signal goes HIGH. This signal goes LOW when an
error occurs (paper-out, paper jam).
AUTO FEED XT [Input]
When this signal is LOW, the automatic line feed mode (Carriage Return and Line
Feed) is effective. The printer can read this signal only when the printer is turned
on or is initialized by the INIT signal.
INIT [Input]
When this signal goes LOW, the printer is put on BUSY. The printer is reset when
the signal goes from LOW to HIGH.
The pulse width of this signal must be at least 50
ERROR [Output]
This signal goes LOW when the printer detects an error and thus notifies the host
computer that the printer is put in the error status (paper-out, paper jam).
SELECT IN [Input]
When this signal is HIGH, the printer is put in the online status.
Nibble Mode
Host Clk [Input]
STROBE signal to read Data 1 to Data 8.
Negotiation phase:
Trigger signal to send the compatible protocol to the printer.
Data 1 to Data 8 [Input]
The printer receives data on the Host Clk signal. The state of each bit of this signal
must be maintained for at least 0.5 µs from the leading edge of the Host Clk signal.
µs at the printer side.
2-14
BJC-5000
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