Thingmagic Nomad RFID Design Guide Manuel d'utilisateur télécharger pdf (Page 4)

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The average power consumption can be reduced significantly if the RFID reader is activated

periodically rather than continuously. For example, if the reader is configured to search for tags

for only 5 seconds every 3 minutes, the average additional power consumption due to RFID

services drops from 2.7 W to 0.1 W.

Taking these power consumption figures into account, the table below shows the total expected

power consumption based on the services that are active, and gives the anticipated battery life if

the Nomad were run continuously in the indicated state.

Services Active

Combined Average

Power Consumption

Battery

Life

All wireless off, backlight off, processor idling, room

temperature = Reference A

1.1 W

17.1 hours

GPS continuously tracking = References (A+B)

1.3 W

14.4 hours

GPS not tracking, keyboard wedge enabled and

scanning for tags = References (A+D)

4.1 W

4.3 hours

GPS not tracking , keyboard wedge enabled but not

continuously scanning for = References (A+C)

1.5 W

12 hours

Using the power consumption figures provided above, the user can calculate the average power

consumption and anticipated battery life based on the proportion of time the reader spends in

each state.

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Thingmagic Nomad RFID Design Guide Manuel d'utilisateur Page 4