User`s manual

EC-520 User’s Manual
- 20 -
32 /ERROR
Error happens
with printer.
Out
When the printer is in state of paper out, offline condition
or error, this signal level becomes low.
33 GND
Ground
---
Same with 19～30 pins.
34 NC
Empty pin ---
This pin is empty.
35 +5V +5V supply Out
Pull up to 5V by the 3.3KΩpull-up resistor.
36 /SLCTIN
Printer is
selected and
answered.
In
Only when this signal level is low, can the data be put into
the printer.
 The “direction” in the title panel means the flow direction of printer signal to the printer.
 “Return” in the title panel means returning by pair-twist. You must confirm that the interface
cable is pair-twist shielding line, and every signal line is looped with ground line and
pair-twisted together. Shielding line should be connected with the frame ground of host
computer and printer.
 All the interface condition is based on TTL level. The rising and falling time of signal must
be less than 0.2 ms.
 The data transfer must comply with the specification of ACKING or Busy signal. Only when
the level of ACKING or Busy signal is low can data be transferred.
(4) Time sequence of Parallel to transmit data (as shown by figure 5-3):
B
US
/
A
C
K
DA
T
/
STR
0.5
μs
0.5
μs
0.5
μs
5
μs
5
μs
Figure 5-3 Time sequence of Parallel to transmit data