Epson ActionPrinter 3250 User Manual - Page 78

Pulled up to 5V through 1 .O KQ, A-10

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Technical Specifications Signal Pin 15 16 18 32 33 34 35 36 Return Pin - 16 Signal Direction NC GND CHASSIS GND NC GND INIT IN ERROR OUT - GND - - NC - - OUT - NC Description Not used Logic ground level Printer's chassis ground, which is isolated from the logic ground Not used Twisted-pair return signal ground level When this level becomes LOW, the printer controller is reset to its power-up state and the print buffer is cleared. This level is normally HIGH; its pulse width must be more than 50 microseconds at the receiving terminal. This level becomes LOW when the printer is: 1) in a paper-out state 2) in an error state Same as for pins 19-30 Not used Pulled up to 5V through 1 .O KQ resistance. Not used Note: l The column heading "Direction" refers to the direction of signal flow as viewed from the printer. l "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. l All interface conditions are based on the TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds. l 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 BUSY signal is LOW. A-10 Appendix

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Technical Specifications
Signal
Pin
15
Return
Pin
-
Signal
NC
Direction
Description
Not used
Logic ground level
Printer’s chassis ground, which is
isolated from the logic ground
Not used
Twisted-pair return signal ground level
When this level becomes LOW,
the printer controller is reset to its
power-up state and the print buffer is
cleared. This level is normally HIGH;
its pulse width must be more than 50
microseconds at the receiving terminal.
This level becomes LOW when the
printer is:
1) in a paper-out state
2) in an error state
Same as for pins 19-30
Not used
Pulled up to 5V through 1 .O KQ
resistance.
Not used
16
GND
CHASSIS
GND
18
NC
GND
16
IN
INIT
ERROR
32
OUT
33
34
35
GND
-
NC
-
-
-
-
OUT
36
-
NC
Note:
l
The column heading “Direction” refers to the direction of signal flow as
viewed from the printer.
l
“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.
l
All interface conditions are based on the TTL level. Both the rise and fall times
of each signal must be less than 0.2 microseconds.
l
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 BUSY signal is LOW.
A-10
Appendix