XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 62
The above example illustrates an AT command when querying an NH value.
AT Command - Queue Parameter Value
Frame Type: 0x09
This API type allows module parameters to be queried or set. In contrast to the “AT Command” API type, new
parameter values are queued and not applied until either the “AT Command” (0x08) API type or the AC (Apply
Changes) command is issued. Register queries (reading parameter values) are returned immediately.
Example: Send a command to change the baud rate (BD) to 115200 baud, but don't apply
changes yet. (Module will continue to operate at the previous baud rate until changes are applied.)
Note: In this example, the parameter could have been sent as a zero-padded 2-byte or 4-byte value.
TX Request
Frame Type: 0x10
A TX Request API frame causes the module to send data as an RF packet to the specified destination.
The 64-bit destination address should be set to 0x000000000000FFFF for a broadcast transmission (to all
devices). For unicast transmissions the 64 bit address field should be set to the address of the desired
destination node. The reserved field should be set to 0xFFFE.
This example shows if escaping is disabled (AP=1).
Frame Fields Offset Example Description
A
P
I
P
a
c
k
e
t
Start Delimiter 00x7E
Length
MSB 1 0x00
Number of bytes between the length and the checksum
LSB 2 0x04
Frame-specific Data
Frame Type 30x08
Frame ID 40x52
Identifies this command for correlation to a later response
frame (0x88) to this command. If set to 0, no response
frame will be sent.
AT Command 50x4E (N)
Command Name - Two ASCII characters that identify the
AT Command.
6 0x48 (H)
Parameter Value
(optional)
If present, indicates the requested parameter value to set
the given register. If no characters present, register is
queried.
Checksum 8 0x0F 0xFF - the 8 bit sum of bytes from offset 3 to this byte.
Frame Fields Offset Example Description
A
P
I
P
a
c
k
e
t
Start Delimiter 00x7E
Length
MSB 1 0x00
Number of bytes between the length and the checksum
LSB 2 0x05
Frame-specific Data
Frame Type 30x09
Frame ID 40x01
Identifies the UART data frame for the host to correlate
with a subsequent ACK (acknowledgement). If set to 0,
no response is sent.
AT Command
5 0x42 (B)
Command Name - Two ASCII characters that identify the
AT Command.
6 0x44 (D)
Parameter Value
(ATBD7 = 115200
baud)
0x07
If present, indicates the requested parameter value to set
the given register. If no characters present, register is
queried.
Checksum 8 0x68 0xFF - the 8 bit sum of bytes from offset 3 to this byte.
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