Interface Specifications - Epson FX-1050 Product Information

SelecType
The settings you using the SelecType panel remain valid even after
select
you turn off, reset, or initialize the printer.
Note: Proportional spacing and condensed mode cannot be combined.
If you select both, only proportional spacing works.
Your printer is equipped with an &bit parallel interface. For specifications
for optional interfaces, see the manuals provided with the optional
interfaces.
Pin assignments for the parallel interface
Connector pin assignments and a description of their respective interface
signals are shown in the following table.
Signal Return
Direc-
Signal
Pin Pin
1
1 9 S T R O B E
I
9 - Pin Printers
FONT
Press this button to select draft, near
letter quality Roman. or near letter
quality Sans Serif. The indicator light
shows which font has been selected.
CHARACTERS PER INCH
Press this button to select the
characters per inch (cpi). You can
choose 10 CPI. 12 CPI. or PS
(proportional spacing). The indicator
light shows the selected character
spacing.
CONDENSED
Press this button to select either
condensed or normal printing. The
light is on when the printer is in
condensed mode. In this mode, all
characters are approximately 60% of
their normal width.
Description
tion
IN STROBE pulse lo read data in. Pulse
width must be more than 0.5
microseconds at the receiving terminal
IN These signals represent information of
IN the 1st to 8th bits of parallel data
IN respectively Each signal is at HIGH level
IN when data is logical 1 and LOW when it is
IN logical 0
IN
indicates that data has been received
and that the printer is ready lo accept
more data
1 2 / 1 2 / 8 8
FX - 850/1050 DOT - MATRIX PRINTER
The column heading "Direction" refers to the direction of signal flow
l
as viewed from the printer.
.
"Return" denotes the twisted-pair return. to be connected at signal
ground level. For the interface wiring, be sure to use a twisted-pair
cable for each signal and to complete the connection on the return
side. These cables should be shielded and connected to the chassis of
the host computer and the printer.
All interface conditions are based on TTL level. Both the rise and the
l
fall times of each signal must be less than 0.2 microseconds.
Data transfer must be carried out by observing the ACKNLG or
l
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 DC1/DC3 ERROR
(Indicator
on/off
control)
i n t e r f a c e )
High DC1
on line
Recv'd
DC3
on line High
Recv'd
High/Low DC1/DC3 Low
off line
(no effect) (no effect)
*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.
BUSY ACKNLG 1 Printing
(Disabled/
enabled)
I
cond.)
High/Low Pulsed Enabled
High
ea. char.
Disabled'
High High/Low Pulsed
ea. char.
High Not Disabled
generated
F X - 8 5 0 / 1 0 5 0 - 5