XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 122
RN (Delay Slots) Command
RO (Packetization Time out) Command
RP (RSSI PWM Timer) Command
Command Summary
Description
AT Command: ATRN
<Networking> RN Command is only
applicable if retries have been
enabled [RR (Retries) Command], or if
forced delays will be inserted into
a transmission [refer to TT (Streaming
Limit) Command]. RN Command is
used to adjust the time delay that the
transmitter inserts before attempting
to resend a packet. If the transmitter
fails to receive an acknowledgement
after sending a packet, it will insert a
random number of delay slots
(ranging from 0 to (RN minus 1)) before
attempting to resend the packet.
Each delay slot lasts for a period of
38ms.
If two modules attempted to transmit at
the same time, the random time
delay after packet failure would allow
one of the two modules to transmit
the packet successfully, while the other
would wait until the channel
opens up to begin transmission.
Binary Command: 0x19 (25 decimal)
Parameter Range:0 – 0xFF [slots]
Default Parameter Value: 0 (no delay slots
inserted)
Number of bytes returned: 1
Command Summary
Description
AT Command: ATRO <Serial Interfacing> RO Command is used
to specify/read the time of
silence (no bytes received) after which
transmission begins. After a serial
byte is received and if no other byte is
received before the RO time out,
the transmission will start.
Binary Command: 0x21 (33 decimal)
Parameter Range:0 – 0xFFFF [x 200 µs]
Default Parameter Value: 0
Number of bytes returned: 2
Command Summary
Description
AT Command: ATRP <Diagnostics> RP Command is used to
enable a PWM (“Pulse Width Modulation”)
output on the Config pin which is
calibrated to show the level the
received RF signal is above the sensitivity
level of the module. The PWM
pulses vary from zero to 95 percent. Zero
percent means the received RF
signal is at or below the published
sensitivity level of the module. The
following
table shows levels above sensitivity and
PWM values.
The total period of the PWM output is
8.32 ms. There are 40 steps in the
PWM output and therefore the minimum
step size is 0.208 ms.
Binary Command: 0x22 (34 decimal)
Parameter Range:0 - 0x7F
[x 100 milliseconds]
Default Parameter Value: 0 (disabled)
Number of bytes returned: 1
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