User Manual

ThingMagic Nano User Guide 40
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Power Modes
The Power Mode setting (set in /reader/powerMode) allows the user to trade off increased RF operation
startup time for additional power savings. “MINSAVE” refers to the minimum amount of power saving
applied, which results in a higher idle power level than “MAXSAVE”.
The details of the amount of power consumed in each mode is shown in the table under Idle DC Power
Consumption. The behavior of each mode and impact on RF command latency is as follows:
• PowerMode.FULL – In this mode, the unit operates at full power to attain the best performance
possible. This mode is intended for use in cases where power consumption is not an issue. This is the
default Power Mode at startup.
• PowerMode.MINSAVE – This mode may add up to 20 ms. of delay from idle to RF-on when initiating
an RF operation. It performs more aggressive power savings, such as automatically shutting down the
analog section between commands, and then restarting it whenever a tag command is issued.
MEDSAVE and MAXSAVE are the same as MINSAVE
• PowerMode.SLEEP – This mode essentially shuts down the digital and analog boards, except to power
the bare minimum logic required to wake the processor. This mode may add up to 20 ms. of delay from
idle to RF on when initiating an RF operation. (There is no known disadvantage to using SLEEP mode
rather than any of the M**SAVE modes, since their wake-up times are nearly identical.)
NOTE: See additional latency specifications under
Event Response Times.
Performance Characteristics
Event Response Times
The following table provides information on how long common ThingMagic Nano operations take. An event
response time is defined as the maximum time from the end of a command to the beginning of the action
the command enables. For example, whenever appropriate, the time represents the delay between the last
byte of a read command and the moment when an RF signal is detected at the antenna.
Event Response Times
Start Command/
Event End Event
Typical
Time
(msecs) Notes
Power Up Application Active
(with CRC check)
140 This longer power up period should only
occur for the first boot with new firmware.
Power Up Application Active 28 Once the firmware CRC has been verified
subsequent power ups do not require the
CRC check be performed, saving time.
Tag Read RF On 8 When in Power Mode = FULL
Tag Read RF On 20 When in Power Mode = MINSAVE
Tag Read RF On 20 When in Power Mode = SLEEP