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Last modified by Mengting Qiu on 2025/07/03 18:55
From version 148.3
edited by Xiaoling
on 2024/03/20 17:58
Change comment: There is no comment for this version
To version 146.1
edited by Edwin Chen
on 2024/03/03 16:50
Change comment: There is no comment for this version

Summary

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1 -XWiki.Xiaoling
1 +XWiki.Edwin
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53 53  (% style="color:#037691" %)**AT+QBAND?       **(%%) ~/~/ Check what is the current used frequency band
54 54  (% style="color:#037691" %)**AT+QBAND=1,4    **(%%) ~/~/ Set to use 1 frequency band. Band4
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**
56 +(% style="color:#037691" %)**Global General**(%%) : **AT+QBAND=11,8,20,28,2,4,12,13,66,85,5,4**
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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651 651  1*. **AT+TR=1800** ~/~/ The unit is seconds, and the default is to record data once every 1800 seconds (30 minutes, the minimum can be set to 180 seconds)
652 652  1*. **AT+NOUD=24** ~/~/  The device uploads 24 sets of recorded data by default. Up to 32 sets of record data can be uploaded.
653 653  1*. **AT+TDC=7200**  ~/~/ Uplink every 2 hours.
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.
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.
655 655  
656 656  
657 -
658 658  == 4.2 Why the uplink JSON format is not standard? ==
659 659  
660 660  
661 661  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.
662 662  
663 -The firmware version released after 2024, Mar will use change back to use Json format. Detail please check changelog.
664 -
665 665  [[image:image-20240229233154-1.png]]
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742 742  When the MCU is communicating with the NB-IoT module, the MCU response of AT Command will become slower, it might takes several seconds to response.
743 743  
744 744  [[image:image-20240226111928-1.png]]
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