RN-42 Roving Networks Inc, RN-42 Datasheet - Page 18

• Manufacturer Part Number: RN-42
• Description: MODULE BLUETOOTH V2.1+EDR
• Manufacturer: Roving Networks Inc
• Series: RNr

Specifications of RN-42

• Frequency: 2.4GHz
• Data Rate - Maximum: 3Mbps
• Modulation Or Protocol: Bluetooth v2.1+EDR, Class 2 & 3
• Applications: General Purpose
• Power - Output: 2dBm
• Sensitivity: -80dBm
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Receiving: 25mA
• Current - Transmitting: 25mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: On-Board, Chip
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Packaged Unit
• Wireless Frequency: 2.4 GHz
• Data Rate: 1200 bps to 921 Kbps
• Modulation: FHSS, GFSK
• Operating Voltage: 3.3 V
• Antenna: Chip
• Operating Temperature Range: - 40 C to + 85 C
• Output Power: 2 dBm
• Technology/ Type: Class 2 Bluetooth Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 740-1038

5.4 Disabling Output Drivers
5.5 Lowering Transmit Power
www.rovingnetworks.com
To enable even lower power utilization, use the S|, <hex word> command to set an on/off duty cycle.
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:
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.
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
Use the command “ S%,1000” to set all PIO0-11 to inputs.
This will also turn off the LED (PIO5) on the FireFly adapter.
809 University Avenue
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reduce effective range for security reasons
lower radio emissions for agency compliancy concerns
reduce total power consumption
Setting
-24
-16
-12
-8
-4
0
4
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Los Gatos, CA 95032
Hex value
FFFC
FFE8
FFF0
FFF4
FFF8
0001
0004
~ 18 ~
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Tel [phone]
Approximate output (dBM)
rn-bluetooth-um Version 4.77 1/24/2011
12 (default)
Advanced User Manual
-20
-10
-5
0
2
6
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