Epson Y465ss127mo - Manual (Page 247)

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All interface conditions are based on TTL level. Both the rise and the
fall times of each signal must be less than 0.2 microseconds.
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Data transfer must be carried out by observing the ACKNLG or
BUSY signal. Data transfer to this printer can be carried out only
after receipt of the ACKNLG signal or when the level of the BUSY
signal is LOW.
Printing enabled/disabled signals and control conditions
The following table shows the relationship between printing being
enabled or disabled, the on line/off line status, and the receipt of the data
on/off control characters, DC1 or DC3.
ON LINE SLCT IN ERROR BUSY
(Data
control)
ACKNLG Printing
(Disabled/
enabled)
on line High DC1 High High/Low Pulsed Enabled
Recv’d ea. char.
on line High DC3 High High/Low Pulsed Disabled’
Recv’d ea. char.
off line High/Low DC1 Low High Not Disabled
(no effect) (no effect) generated
*While printing is disabled, character data is being received and
acknowledged so that the printer can look for another DC1 character,
which would allow it to resume printing.
Technical Specifications
A-11