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Last modified by Mengting Qiu on 2025/07/03 18:55
From version 148.1
edited by Edwin Chen
on 2024/03/17 00:13
Change comment: There is no comment for this version
To version 145.2
edited by Xiaoling
on 2024/03/01 10:15
Change comment: There is no comment for this version

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Author
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1 -XWiki.Edwin
1 +XWiki.Xiaoling
Content
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51 51  BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail and show Signal Strenght:99. User can lock the band to specify band for its operator to make this faster.
52 52  
53 53  (% style="color:#037691" %)**AT+QBAND?       **(%%) ~/~/ Check what is the current used frequency band
54 +
54 54  (% style="color:#037691" %)**AT+QBAND=1,4    **(%%) ~/~/ Set to use 1 frequency band. Band4
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55 55  (% style="color:#037691" %)**Europe General**(%%) **AT+QBAND=2,8,20 ** ~/~/ Set to use 2 frequency bands. Band 8 and Band 20
56 -(% style="color:#037691" %)**Global General**(%%) : **AT+QBAND=10,8,20,28,2,4,12,13,66,85,5**
57 57  
58 58  (% style="color:#037691" %)**Verizon**(%%)** ** AT+QBAND=1,13
59 59  (% style="color:#037691" %)**AT&T**(%%)           AT+QBAND=3,12,4,2
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654 654  1*. this will mean each uplink will actually include the 6 uplink data (24 set data which cover 12 hours). So if device doesn;t lost 6 continue data. There will not data lost.
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657 657  == 4.2 Why the uplink JSON format is not standard? ==
658 658  
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659 659  The json format in uplink packet is not standard Json format. Below is the example. This is to make the payload as short as possible, due to NB-IoT transmit limition, a standard Json is not able to include 32 sets of sensors data with timestamp.
660 660  
661 -The firmware version released after 2024, Mar will use change back to use Json format. Detail please check changelog.
662 -
663 663  [[image:image-20240229233154-1.png]]
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742 742  [[image:image-20240226111928-1.png]]
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