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Power Modes
Power modes are controlled by the Power Mode parameter (see
•
In Continuous Power mode, the scan engine remains in the Awake state after each decode attempt.
The Continuous Power mode parameter (see
the Awake power state unless it receives a SLEEP command. In this mode, the SE955 can switch power
states using the SLEEP and WAKEUP commands (see
10-33); automatic power state switching is not supported.
•
In Low Power mode, the scan engine enters into a low power consumption Sleep state whenever
possible (provided all WAKEUP commands were released), drawing less current than in Continuous
Power mode. This makes the Low Power mode more suitable for battery powered applications. The Low
Power mode also allows the SE955 to switch power states using the SLEEP and WAKEUP commands
(see
SLEEP on page 10-30
Sleep power state before performing any functions.
Table 1-1
shows how to put the SE955 into Low Power mode.
Putting the SE955 into Low Power Mode
Table 1-1
Action
Set the Power Mode parameter to Low Power
Send the serial SLEEP command
Note:
All wake up signals (see Table 1-2) must be inactive to enter Sleep power state. Once the SE955 is awakened,
at least 1 second must elapse before it re-enters Low Power mode.
Waking Up the SE955
Table 1-2
Signal
AIM/WKUP*
TRIG*
CTS*
RXD
Signal names with the "*" modifier are asserted when at the positive logic
0 state (active low). Signal names without the "*" modifier are asserted
when at the positive logic 1 state (active high).
When the SE955 is awakened, it remains awake for at least 1 second before re-entering Low Power mode.
The host must perform its first action within the 1 second time period if the power mode parameter is set to Low
Power.
Power Mode on page
and
WAKEUP on page
10-33). The SE955 must be awakened from the
The SE955 enters Low Power mode and automatically
switches to the Sleep power state whenever possible.
The SE955 enters Sleep power state only once, as soon as
possible.
State to Wake Up
Low
Low
Low
Send 0x00
Getting Started
Power Mode on page
8-12) sets the SE955 to remain in
SLEEP on page 10-30
and
Table 1-2
shows how to awaken it.
Behavior
1 - 5
8-12).
WAKEUP on page
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