Thingmagic M5e-Compact Manual de usuario descargar pdf (Pagina 41)

Power Management

Functionality of the Embedded Modules 41

Low Power Mode

This mode minimizes power consumption and optimizes thermal characteristics without

compromising performance in many, but not all, applications. Low power mode uses less

DC power than High Performance mode at all RF transmit levels. It consumes up to 7.5W

(6.5 typical) at a transmit level of +30dBm, decreasing to 3.5W at transmit levels of

+20dBm and below. Low Power mode should be selected for most applications,

including:

 All tag printer applications (where tags are placed very close to the antenna)

 All applications where the Read and Write transmit power levels are between +27 and

+30 dBm.

If the application does not meet the above criteria, the optimum mode can be determined

by considering a combination of conditions: expected transmit on/off duty cycle, expected

ambient temperature, and whether the reader will be operating in a noisy RF

environment.

The following table provides recommendations on which Power Mode to use for various

application environments: printer, few readers (non-dense reader environment), many

readers (dense reader environment); based on the required RF Power level.

Power Mode per Operational Environment and RF Power Setting

Thermal characteristics are another differentiator between the two modes. Low Power

Mode allows the module to operate in a 60

C ambient environment, regardless of how

continuously the module is transmitting. High Performance mode is only recommended in

a 60

C environment if the module is actively transmitting less than 50% of the time. If the

module is transmitting more often than this, a lower maximum ambient temperature must

be maintained as show in the following table:

RF Transmit Power 5-18 dBm 18-27dBm 27-30 dBm

Low Power Mode • Printer

• Few Readers

• Printer • Printer

• Few Readers

• Many Readers

High Performance Mode • Many Readers • Few Readers

• Many Readers

•

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 251 252

Sin comentarios

Thingmagic M5e-Compact Manual de usuario Pagina 41