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AT commands
PANs. If you set the ReassignChannel option, SD determines how long the coordinator performs an
Energy Scan to determine which channel it will operate on.
End Device: Duration of Active Scan during Association. In a Beacon system, set SD=BE of the
coordinator. SD must be set at least to the highest BE parameter of any Beaconing Coordinator with
which an end device or coordinator wants to discover.
Scan Time is measured as:
([# of channels to scan] * (2 ^SD) * 15.36 ms) + (38 ms * [# of channels to scan]) + 20 ms
Use the SC (Scan Channels) command to set the number of channels to scan. The XBee can scan up to
16 channels (SC = 0xFFFF). The XBee-PRO can scan up to 13 channels (SC= 0x1FFE).
SD influences the time the MAC listens for beacons or runs an energy scan on a given channel.
Example
The following table shows the results for a thirteen channel scan.
SD setting
0
2
4
6
8
10
12
14
Parameter range
0 - 0x0F (exponent)
Default
4
A1 (End Device Association)
Sets or displays the End Device association options.
Parameter range
0 - 0x0F (bit field)
Bit field:
XBee/XBee-PRO S2C 802.15.4 RF Module User Guide
Time
0.18 s
0.74 s
2.95 s
11.80 s
47.19 s
3.15 min
12.58 min
50.33 min
Networking and security commands
76
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