Opticon MDI-4000 Series, Руководство по последовательному интерфейсу, Страница: 59 / 139

MDI-4000 Series Serial Interface Manual
47
5.5 Power ON /OFF Timing
The power on/off timing of the scan engine is described below.
5.5.1 Power-On Timing
Power-on timing indicates the time from power on until barcodes are readable.
*1
Cannot be used when Handshaking is set to MODEM, because the RTS signal is “High.”
Figure 28: Power-On Timing
Startup Time Modes
(IF:UART/USB V
CC
= 3.3V/5.0V TA = 25°C)
Mode Condition Min. Typ. Max. Unit
Normal Boot - 510 - ms
Fast Boot Mode Configured* 425 - ms
* For more information, see
“Fast Boot Mode” on page 12
.
5.5.2 Power-Off Timing
When the power is turned off while an input signal to the scan engine is high, leakage current is
drawn from that signal. So, set
all input signals to the scan engine to “High impedance” or
“Low.”
When power to the scan engine is turned off (V
CC
of 1V or less), you need to wait at least 10 ms
before turning on the power again.
I
PK
Boot Standby Read Standby Low power
I
OP
10 ms -
I
STD
I
LOW
* Configured
Boot time
Rush
State
Vcc
ON
OFF
High
Low
RTS
TRIGn
High
Low
Wave form
Command acceptable