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23
24
25
26
27
28
29
30
31
Host
32
Printer
33
34
Printer
35
Printer
36
Host
NOTES: 1. A prefix "n" to signal names refer to low level active signals.
2. To the host provided with none of the signal lines listed above, both-way communication fails.
3. For interfacing, signal lines shall use twisted pair cables with the return sides connected to signal ground
level.
4. Interfacing conditions shall be all based on the TTL level to meet the following characteristics In addition,
both rise and fall time of each signal shall be 0.5|js or less.
5. Data transmission shall not ignore the signal n Ack or Busy. An attempt to transmit data with signal, nAck
or Busy, ignored can cause data lose. (Data transmission for the printer shall be made after verifying the
nAck signal or while the Busy signal is at the low level.)
6. Interface cables shall be as min required short in length as possible.
Electrical Characteristics
DC Characteristics (Except Logic- H, + 5 V signals)
Characteristics
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Logic - H Signal Sender Characteristics
Characteristics
Output High Voltage
Output Low Voltage
PRINTEX P250 User Manual
GND
GND
GND
GND
GND
GND
GND
GND
nInit
nFault
GND
DK_STATUS
+5V
nSelectIn
*NC: Not Connected ND: Not Defined
Specifications
Symbol
Min
V
*2.4 V
oh
V
-0.5 V
ol
I
0.32 mA
oh
I
-12 mA
oL
V
2.0 V
ih
V
-
il
I
-
ih
I
-
lL
Specifications
Symbol
Min
V
3.0 V
oh
V
-
ol
GND
GND
GND
GND
GND
GND
GND
GND
nInit
nDataAvail/Data0, 4
ND
ND
ND
1284-Active
Conditions
Max
5.5 V
*I
=0.32 mA
oh
*0.4 V
*I
=-12 mA
ol
-
V
=2.4 V
oh
-
V
=0.4 V
ol
-
0.8 V
-0.32 mA
V
=2.0 V
ih
12 mA
V
=0.8 V
il
Conditions
Max
5.5 V
While the
2.0 V
power is OFF
9
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