User's Manual

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Bit
Name
Value
Description
7~4
DR
0~15
Data Rate(DR0~DR15). The default value is DR2.
If ADR is disabled, the Device will work in this
data rate.
3~0
Reserved
0x0
Reserved for future use.
POS field
Bit
Name
Value
Description
15~0
POS
0~65535
The period of position report, unit 5s. 0 means
OFF. (Big endian) The default value is 10s.
The Device will start BLE scanning several seconds before the end of every scan period, the default value
is 3 seconds, which is configurable. Besides, scan period and send period are different, the purpose is to
reduce the send delay, that’s because in some situation the outdoor Device may be configured to detect
every 30 minutes or one hour, if still only send the data at the end of scan period, it will take hours to
send all the beacons once there’re tens of beacons. To solve this issue, the Device will check the scan
period every time, if scan period is more than 5 minutes, after it sending the data at the end of scan
period, it will go on checking the buffer, if still having beacons not sent it will launch another
transmission 10 seconds later till all the beacons are sent.
HB field
Bit
Name
Value
Description
7~0
HB
1~255
The period of Heartbeat message, unit 30s.
Heartbeat can’t be disabled. The default value is
10.
CRC field
Bit
Name
Value
Description
15~0
CRC
CRC16 of previous fields with TYPE bits set to 0, the
polynomial is 

 

 

  . CS only need
to compare this data field with the CS stored one
to judge whether configuration changed.
Default value of Device configuration depends on specific products.
4.3.2 Heartbeat
Bytes
1
1
1
2
1
1
2
Item
TYPE
VOL
RSSI
SNR
RFU
CHGSTAT
CRC
TYPE field
Bit
Name
Value
Description
7~4
TYPE
0x2
Message type, CS can use it to identify different
uplink messages.
3~0
Version
1
Version of the message type, current version is 1.
C256U-PQ User Manual