AT commands Network commands
XBee®-PRO 900HP/XSC RF Modules
84
Parameter range
1 - 0x20
Default
7
NN (Network Delay Slots)
Set or read the maximum random number of network delay slots before rebroadcasting a network
packet.
Parameter range
1 - 0x05
Default
3
MR (Mesh Unicast Retries)
Set or read the maximum number of network packet delivery attempts. If MR is non-zero, the packets
a device sends request a network acknowledgment, and can be resent up to MR+1 times if the device
does not receive an acknowledgment.
Changing this value dramatically changes how long a route request takes.
We recommend that you set this value to 1.
If you set this parameter to 0, it disables network ACKs. Initially, the device can find routes, but a
route will never be repaired if it fails.
Note This command is supported in the 200k variant only.
Parameter range
0 - 7
Default
1
RN (Delay Slots)
Sets or displays the time delay that the transmitting device inserts before attempting to resend a
packet. If the transmitting device fails to receive an acknowledgment after sending a packet, it
inserts a random number of delay slots (ranging from 0 to [RN minus 1]) before attempting to resend
the packet. Each delay slot is 38 ms.
If two devices attempt to transmit at the same time, the random time delay after packet failure only
allows one device to transmit the packet successfully, while the other device waits until the channel is
available for RF transmission.
RN is only applicable if:
n You enable retries using the RR command, or
n You insert forced delays into a transmission using the TT command
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