PRINTEX P250 Manual page 16

+5 V Signal Sender Characteristics
Characteristics Symbol
Output High Voltage
Output Low Voltage V
oh
Output High Current V
ol
Output Low Current I
oh
I
ol
** No guarantee is offered to V and I
OL
Parallel Data Receiving Timing
Reset printer by parallel
To enable the printer reset by nlnit signal (PIN 31) in compatibility mode. Set nlnit signal by SWITCH DIP. To
enable the printer reset, meet the following signal timing.
The signal is ignored when #36 nSelectln /1284-Active is high in reverse mode.
□
DC characteristic TTL Level
□
AC characteristic
Min reset pluse width: TRS 50^s (min)
NOTE: The prefix "n" named active-low
Reception of status from the printer through the bidirectional parallel interface
In the bidirectional parallel interface specifications, the printer status transmission is available by
using the both-way communication facility in the Nibble/Byte Modes in accordance with the IEEE 1284.
In this case, different from in the RS-232 serial interface specifications, the real-time interruptions from the
printer to the host are disabled and thus precautions must be taken to the followings:
1) Allowable capacity of the printer internal buffer is 99 bytes (except ASB status), The status signals
exceeding this capacity will be discarded, To prevent possible loss of status, the host shall be ready for data
acception (Reverse Mode).
PRINTEX P250 User Manual
Specifications
Min Max
*2.4 V 5.5 V
-
- 0.32 mA
-
while the power is OFF.
OL
Parallel Interface Signal Timing Figure as follows(Compatibility Mode):
Conditions
*I =0.32 mA
oh
While the power is
OFF
V =2.4 V
oh
While the power is OFF
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