Epson FX-80 Operation Manual page 67

Relations among the ON-LINE switch, SLCT IN signal, DClIDC3 code and
interface signals are shown in the table below.
Relations among ON-LINE, SLCT IN, DC1/DC3 and Interface Signal
ON-LINE SLCTIN DATA
Switch Signal
DC1/DC3 ERROR BUSY ACKNLG
ENTRY
OFF-LINE
HIGH/LOW DC1/DC3 LOW
HIGH
Not generated Disable
Enable
DC1 HIGH
LOW/HIGH Generated (Normal
HIGH
entry)
Enable
DC3
HIGH LOW/HIGH Generated (See
ON-LINE
Note 2.)
Enable
LOW DC1/DC3 HIGH LOW/HIGH Generated (Normal
entry)
NOTES:
1. In the above table, it is assumed that no ERROR status exists other than that
attributable to the OFF-LINE mode.
2. Once DC3 is input and the printer enters the Deselected state, it will remain in that
state until DCI is input. In other words, while the printer is in the Deselected state,
all input data will be invalid.
3. The DCI/DC3 code is valid provided that the DIP switch pin 2-1 is OFF, namely,
the level of SLCT IN at the pin No.
36
of the interface connector is HIGH. With
SLCT IN at LOW level or the DIP switch pin 2-1 position at ON, the printer is
always placed in the Selected state, and the DClIDC3 code is not valid.
4. When power is applied, if SLCT IN is at HIGH level or the DIP switch pin 2-1 is
OFF, the printer is regarded as in the Deselected state.
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