User Manual

5.3.4 Set the period of Class B Slot
Format Note
Instruction AT+SLOTFREQ=64
1，2，4，8，16，
32，64，128，for
example 64,
means one
communication
per 64 seconds.
Respond
AT+SLOTFREQ=OK /
AT+SLOTFREQ=ERROR
Instruction AT+SLOTFREQ=? The query
Respond AT+SLOTFREQ=64
Return query
results
Note：The instruction is valid under Class B.
Optional value is set as: 1 / 2 / 4 / 8 / 16 / 32 / 64 / 128. The shorter of the setting
cycle, the greater power consumption of the module.
This instruction supports in - running switching (e. g. , to transfer files, temporarily
switch to the 1S cycle and then cut back to the 64S cycle)
By default, the slot cycle of the Class B is 64 seconds, or 64 seconds per
communication, and two communication windows open in a beacon cycle. ( Note,
the 64 seconds here is just a rough, not a strict cycle) The role of the AT
instruction is to ensure power consumption while increasing the respond speed.
For example, when the APP is opened or has a profile to pass down, the slot cycle
of the device can be changed to 1 second (file download) and 4 seconds (APP
open). Application of the protocol is required to cooperate here. The equipment
side also needs to add a certain time out management to avoid the increase in
system power consumption caused by too short slot cycle.
If the setting is successful, save automatically and the saved value is used to the next
start.
The reason of ERROR returned after AT: No parameter or parameter value error.
5.3.5 Send the access network instruction
Format Note
Instruction AT+JOIN
Start the network
access