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REV.-A
NOTE 3: All interface conditions are based on TTL levels. Both the rise and fall times of all signals must
be 0.2 ILsec. or less.
NOTE 4: Refer to the Interface Timing Chart (Figure 1-11) for details on each signal.
NOTE 5: Data transfer protocol must not ignore the ACKNLG or BUSY signal. (Data can be transferred
after either recognizing the ACKNLG signal or when the BUSY signal is LOW.)
NOTE 6: The AUTO FEED XT and SLCT IN signals will be valid when "AUTO LF" and "DC 1/DC3" are
set "ON" and "VALID", respectively, in the SelecType mode.
NOTE 7: Printing tests, including those of the interface circuits, can be executed without using external
equipment by setting the DATA 1 to DATA8 lines of the interface connector to certain codes
(1 for GND open, and 0 for short) and connecting the ACKNLG signal to the STROBE signal.
Table 1-9. Printer Select/Deselect Control with the DC1/DC3 Code
SLCTIN
Printer
Receive
ERROR
BUSY
State
Signal
Code
Signal
Signal
ACKNLG
Data Processing
Input
OFF LINE
High
DC1
Low
High
Not output
Data entry disabled
(Error)
DC3
Low
DC1
DC3
ON LINE
High
DC1
High
Low (NOTE1) Output after
Data entry (normal
each data
processing).
entry
DC3
High
Low
Output after
Data entry enabled,
(NOTE 1)
each data
However, input data is
entry
ignored (waits for
DC 1, NOTE 2).
Low
DC1
High
Low (NOTE1) Output after
Data entry enabled
each data
(normal processing)
entry
DC3
High
Low (NOTE1) Output after
each data
entry
NOTE 1: BUSY
=
LOW" is the state before data is input. During data processing, the BUSY signal goes
HIGH and LOW alternately.
NOTE 2: After the DC3 code is input, input data is ignored until the DC 1 code is input.
NOTE 3: In the above table, it is assumed that no ERRORs other than those due to OFF LINE occur.
NOTE 4: The DC1/DC3 control is valid only when "DC1/DC3" is set to"VALlD" (default setting in the
SelecType mode) at printer initialization and the SLCT IN signal from the host computer is
HIGH. At this time, the printer starts operation in the DC 1 state.
NOTE 5: The DC1/DC3 control will be invalid even with "DC1/DC3" set to "VALID" (default setting
in the SelecType mode) at printer initialization, if the SLCT IN signal from the host computer
is LOW.
1-20
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