Epson LQ 300 User Manual page 79

Signal Return
Pin
Pin
-
-
-
-
-
N o t e :
Q
The column heading "Direction" refers to the direction of signal flow as
Viewed from the printer.
cl
"Return" denotes the twisted-pair return, to be connected at signal
ground level. For the interface wiring, be sure to use a twisted-pair
cab/e for
each
side.
cl
A// interface conditions are based on the
times of each signa/ must be less than 0.2 microseconds.
Data transfer must be carried out by observing the ACKNLG or BUSY
signal. Data transfer to this printer
of the ACKNLG signal or when the BUSY signal is LOW.
lnitializa tion
The printer can be initialized (returned to a fixed set of conditions) in three
ways:
Hardware initialization
A - 1 0 A p p e n d i x
Direction
Signal
OUT
ERROR
-
NC
OUT
NC IN
signal and to complete the connection on the return
can
* The power is turned on.
* The printer receives an lNlT signal from
the parallel interface (pin 31 goes LOW).
The following condition then results:
Description
This level becomes LOW
when the printer:
pressed
Same as for pins 19-30
Not used
Pulled up to 5 V through
1 .O kQ resistance
Not used
Both
the rise and
be carried out on/y after receipt
fall