Epson GQ-3500 User Manual page 158

Table F-3. Continued
Signal Return
Pin Pin
36
Notes:
The column headed "Direction" refers to the direction of the signal
as viewed from the printer.
"Return" denotes the twisted-pair return, to be connected to signal
ground. The interface cable should have a twisted-pair for each signal.
Be sure to complete the connection on the return side. To prevent noise,
the cable must be shielded and the shield should be connected to the
chassis of the host computer or the printer.
All the interface signals are 'ITL level. Both the rise and fall times
of each signal must be less than 0.2 microseconds.
Data transfer must be carried out by coordinating with the
ACKNLG or BUSY signals. Data transfer can only be carried out after
receipt of the ACKNL.G signal or when the BUSY signal is LOW.
Parallel Interface
Slgnal tion
IN
the printer is turned on, and DIP
switch 4-3 is OFF, then the
device control codes DC1 and
DC3 are effective. Otherwise
DC1 and DC3 are ignored.
This signal is ignored in the
Line Printer mode; i.e., DC1
and DC3 are ignored.
F - 7