# How to decode the transmitting power value

**URL:** <https://bbs.aprbrother.com/t/how-to-decode-the-transmitting-power-value/1610>\
**Category:** AprilBeacon\
**Created:** [May 22, 2020, 5:46am UTC](https://bbs.aprbrother.com/t/how-to-decode-the-transmitting-power-value/1610 "2020-05-22T05:46:38Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![pauldeng](https://bbs.aprbrother.com/user_avatar/bbs.aprbrother.com/pauldeng/32/440_2.png) [@pauldeng](https://bbs.aprbrother.com/u/pauldeng)\
**Post date:** [May 22, 2020, 5:46am UTC](https://bbs.aprbrother.com/t/how-to-decode-the-transmitting-power-value/1610/1 "2020-05-22T05:46:38Z")

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Hi,

I received a scan response beacon data match this format below:

 ![transmittingpower](https://bbs.aprbrother.com/uploads/default/original/1X/05032e5272be087500bb0c6490e687b6c72bdfe6.png)

I received value 0x09 at the Transmitting Power field.

- What is the 0x09 mean? Is it 0dBm, 2dBm or anything else?
- Is there any table to match the value to actual dBm transmitting power?

Thanks.  
Paul

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<div class="post-metadata">

**Author:** ![aprilpea](https://bbs.aprbrother.com/user_avatar/bbs.aprbrother.com/aprilpea/32/9_2.png) [@aprilpea](https://bbs.aprbrother.com/u/aprilpea)\
**Post date:** [May 22, 2020, 5:55am UTC](https://bbs.aprbrother.com/t/how-to-decode-the-transmitting-power-value/1610/2 "2020-05-22T05:55:21Z")

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Please check [EIR Data Type, Advertising Data Type (AD Type) and OOB Data Type Definitions](https://www.bluetooth.com/specifications/assigned-numbers/generic-access-profile/) from Bluetooth SIG.

`0x09` - Complete Local Name

Do you want to get RSSI or TX power? Please check bit "发射功率"for TX power

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<div class="post-metadata">

**Author:** ![pauldeng](https://bbs.aprbrother.com/user_avatar/bbs.aprbrother.com/pauldeng/32/440_2.png) [@pauldeng](https://bbs.aprbrother.com/u/pauldeng)\
**Post date:** [May 22, 2020, 6:21am UTC](https://bbs.aprbrother.com/t/how-to-decode-the-transmitting-power-value/1610/3 "2020-05-22T06:21:34Z")

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Hi,

I would like to check TX power.

In the received binary message, according to the data payload structure above, the TX power value is 0x09.  
I have no idea what it means. Is it mean 9dBm? How do i interpret this 0x09?

Thanks.  
Paul

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<div class="post-metadata">

**Author:** ![aprilpea](https://bbs.aprbrother.com/user_avatar/bbs.aprbrother.com/aprilpea/32/9_2.png) [@aprilpea](https://bbs.aprbrother.com/u/aprilpea)\
**Post date:** [May 22, 2020, 6:27am UTC](https://bbs.aprbrother.com/t/how-to-decode-the-transmitting-power-value/1610/4 "2020-05-22T06:27:50Z")

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The advertising data struct is a custom format. You should check with the vendor about what means is `0x09`. Or you can try to change the TX power for the beacon and see the bit changes.

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<div class="post-metadata">

**Author:** ![pauldeng](https://bbs.aprbrother.com/user_avatar/bbs.aprbrother.com/pauldeng/32/440_2.png) [@pauldeng](https://bbs.aprbrother.com/u/pauldeng)\
**Post date:** [May 22, 2020, 6:35am UTC](https://bbs.aprbrother.com/t/how-to-decode-the-transmitting-power-value/1610/5 "2020-05-22T06:35:43Z")

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I see.

I thought that data structure is defined by your team.

Thanks a lot for your support.  
Paul