Appendix J
Table 7 (Cont’d)
Signal
Return
Pin No.
Pin No.
Signal
Direction
Description
12 30
PE OUT
Always GND Level.
13 -
SLCT OUT
Pulled up to +5V via 3.3κΩ resistor.
14 -
AUTO
In
FEED X
With this signal being at "LOW" level, the
paper is automatically fed one line after
printing.
(The signal level can be fixed to "LOW"
with AUTO provided on the
control circuit board.)
15 -
NC
Not used.
16 -
OV
Logic GND level.
17 -
CHASSIS-GND
Printer chassis GND.
In the printer, the chassis GND and the
logic GND are isolated from each other.
18 -
+5V -
+5V
19 to 30
- GND
-
TWISTED-PAIR RETURN signal GND level.
31 -
INIT In When the level of this signal becomes
"LOW", the printer controller is reset to its
initial state and the print buffer is cleared.
This signal is normally at "HIGH" level.
and its pulse width must be more than
50µs at the receiving terminal.
32
ERROR Out
Always "HIGH" level Pulled up to +5V via
3.3κΩ resistor.
33 -
GND -
Same as with Pin Nos. 19 to 30.
34
-
RESET Out
Reset signal generated when the Printer is
powered, or when the INIT signal is
applied to the Printer.
35
Pulled up to +5V via 3.3κΩ resistor.
36 - NC - Not used.
NOTES: 1. “Direction” refers to the direction of signal flow as viewed from the
printer
2. “Return” denotes “TWISTED PAIR RETURN” and is to be connected at
signal ground level
As to the wiring for the Interface. be sure to use a twisted-parr cable for
each signal and never fall to complete connection on the Return side.
To prevent noise effectively. these cables should be shielded and con-
nected to the chassis of the host computer and the printer. respec-
tively.
3 All interface conditions are based on TTL level. Both the rise and fall
times of each signal must be less than 0.2µs.
4. Data transfer must not be carried out by ignoring the ACKNLG or BUSY
signal. (Data transfer to this printer can be carried out only after con-
firming the ACKNLG signal or when the level of the BUSY srgnal IS
“LOW”.)
102
