XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 123
PWMChart
A non-zero value defines the time that the PWM output will be active with the RSSI value of the last received
RF packet. After the set time when no RF packets are received, the PWM output will be set low (0 percent
PWM) until another RF packet is received. The PWM output will also be set low at power-up. A parameter value
of 0xFF permanently enables the PWM output and it will always reflect the value of the last received RF
packet.
PWM output shares the Config input pin. When the module is powered, the Config pin will be an input. During
the power-up sequence, the Config pin will be read to determine whether the module is going into AT
Command Mode. After this, if RP parameter is a non-zero value, the Config pin will be configured as an output
and set low until the first RF packet is received. With a non-zero RP parameter, the Config pin will be an input
for RP ms after power up.
RZ (DI Buffer Size) Command
RR (Retries) Command
dBm above Sensitivity
PWM percentage
(high period / total period)
10 47.5 %
20 62.5 %
30 77.5 %
Command Summary
Description
AT Command: ATRZ <Diagnostics> The RZ command is used
to read the size of the DI buffer (UART RX
(Receive)).
Note: The DO buffer size can be
determined by multiplying the DI buffer
size by 1.5.
Binary Command: 0x2C (44 decimal)
Parameter Range:Read-only
Number of bytes returned: 1
This command is only supported on S3B
modules.
Command Summary
Description
AT Command: ATRR Networking> RR Command specifies the
number of retries that can be sent
for a given RF packet. Once RR Command
is enabled (set to a non-zero
value), RF packet acknowledgements and
retries are enabled. After transmitting
a packet, the transmitter will wait to
receive an acknowledgement
from a receiver. If the acknowledgement
is not received in the period of
time specified by the RN (Delay Slots)
Command, the transmitter will transmit
the original packet again. The packet will
be transmitted repeatedly
until an acknowledgement is received or
until the packet has been sent RR
times.
Note: For retries to work correctly, all
modules in the system must have
retries enabled.
Binary Command: 0x18 (24 decimal)
Parameter Range:0 – 0xFF
Default Parameter Value: 0 (disabled)
Number of bytes returned: 1
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