Epson Stylus 1520 User Manual page 258

Signal Return
Pin Pin
32
33
34
35
36
Note:
The column heading "Direction" refers to the direction of signal flow 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.
All interface conditions are based on TTL level. Both the rise and fall times of
each signal 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 can be carried out only after receipt of
the ACKNLG signal or when the level of the BUSY signal is LOW.
C-16
Specifications
Signal
29 ERROR
- GND
- NC
- +5 V
30 SLIN
Direction Description
OUT This signal level goes LOW
when the printer:
1) Is out of paper
2) Has jammed paper
3) Is in an error state
4) Is out of ink
- Same as for Pins 19-30
- Not used
OUT Pulled up to +5 V through
3.3 K resistance
IN Not used