AT commands RF interfacing commands
Digi XBee® 3 Zigbee® RF Module
198
Bit IEEE 802.15.4 channel
13 24
14 25
15 26
Note Avoid channel 26. The output power is capped at 8 dBm on this channel.
Default
0x7FFF (channels 11 through 25)
SD (Scan Duration)
Sets or displays the length of time the device will linger on a channel during an active scan.
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.
Note SD influences the time the MAC listens for beacons or runs an energy scan on a given channel.
The SD time is not an accurate estimate of the router/end device joining time requirements. Zigbee
joining includes additional overhead comprising beacon processing on each channel, and sending a join
request that extends the actual joining time.
Parameter range
0 - 7 (exponent)
Default
3
AS (Active Scan)
Forces an active scan of the neighborhood for beacon responses. The AS command cannot be issued
remotely.
An Active scan returns a multi-line response with each field separated by a carriage return:
AS_type – unsigned byte = Always returns 2, indicating the protocol is Zigbee
Channel – unsigned byte
PAN – unsigned word in big endian format
Extended PAN – eight unsigned bytes in bit endian format
Allow Join – unsigned byte – 1 indicates join is enabled, 0 that it is disabled
Stack Profile – unsigned byte
LQI – Link Quality Indicator - unsigned byte, higher values are better
RSSI – Relative Signal Strength Indicator - signed byte, lower values are better
Each field in the AS response is separated by a carriage return (0x0D character).
An additional carriage return separates multiple beacons.
Two additional carriage returns indicate the end of the Active Scan.
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