Roving Networks RN-374 Manual do Utilizador descarregar pdf (Página 18)

Advanced User Manual

www.rovingnetworks.com

rn-bluetooth-um Version 4.77 11/21/2009

809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com

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5.5 Lowering Transmit Power

All Roving Networks Bluetooth modules and adapters adhere to the Bluetooth (1.1, 1.2, and 2.0/2.1)

specifications for power control. Both the RN-21 and RN-41 radios are Class 1 capable.

The power output of the radio is automatically controlled by the baseband. Depending on the operation mode

(inquiry scan, page scan, connected) the power is adjusted. Once a connection is made, the radios on both

sides negotiate a power setting based on the perceived signal strength (RSSI).

The transmit power can be controlled to:

• reduce effective range for security reasons

• lower radio emissions for agency compliancy concerns

• reduce total power consumption

Use the SY command can be used to configure the transmit power: Using a command, the radio can be

instructed to use a value that is lower than the default.

SY,<hex value> where hex value is unsigned hex representation of the setting.

Setting Hex value Approximate output (dBM)

-24 FFE8 -20

-16 FFF0 -10

-12 FFF4 -5

-8 FFF8 0

-4 FFFC 2

0 0001 6

4 0004 12 (default)

If a non-zero value is stored in the variable, then upon power up, the radio will use the HIGHEST value that

is less than or equal to the stored variable.

Example: if -8 = 0 dBM is desired, you would enter SY,FFF8

If 0 = 6dBm is desired, you would enter SY,0001 ( you could also enter 0002, or 0003 )

Power setting will take effect after power cycle or reboot or reset pin toggle.

To check the STORED power setting, use the O command. you will see TX Power=1 or other setting equal

to the value you entered. To check the current power setting, use the GY command. Only the actual value

will be returned. Leading zeroes will not be displayed. The value of GY may not match the value in the O

command due how the value is used as described above

6 Profile Settings and Features

6.1 Alternate Profile Selection

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