Sd (Scan Duration) - Digi XBee S2C Zigbee User Manual

AT commands
Bit
10
11
12
13
14
15
Note When you set SC to 0xFFFF on the device, Channel 26 is not allowed to transmit at more than 3
dBm. If Channel 26 is present in the search mask (SC), active search (beaconing) for network
formation by a Coordinator is limited to no more than 3 dBm on all channels.
Other communication by a Coordinator/Router/EndDevice, or active search for network joining
(association) by Routers and End Devices is limited to no more than 3 dBm on Channel 26. PL and PM
configuration settings control the transmit power on other channels.
For the XBee-PRO SMT module, Channel 26 is not allowed to transmit at more than 6 dBm.
n
For the XBee-PRO TH module, Channel 26 is not allowed to transmit at more than 2 dBm.
n
Default
0x7FFF

SD (Scan Duration)

This command applies to the XBee/XBee-PRO Zigbee RF Module.
Sets or displays the scan duration exponent. Write changes to SD using the WR command.
Note If you enable channel 26 (0x8000) in the search channel mask (SC), the device caps transmit
power on all channels at 3 dBm during network formation or joining.
Coordinator - Duration of the Active and Energy Scans (on each channel) used to determine an
acceptable channel and PAN ID for the coordinator to startup on.
Router/End Device - Duration of Active Scan (on each channel) used to locate an available
coordinator/router to join during Association.
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.
XBee/XBee-PRO® S2C Zigbee® RF Module User Guide
Parameter
0x15
0x16
0x17
0x18
0x19
0x1A
Network commands
252