Digi XBee Product Manual

API Operation for the XBee/XBee-PRO RF Module
XBee / XBee-PRO RF Modules 802.15.4 Product Manual 92
Figure 16: AT Command frames
Figure 17: Example: API frames when reading the DL parameter value of the module.
Figure 18: Example: API frames when modifying the DL parameter value of the module.
AT Command - queue parameter value
API identifier value: 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.
AT command response
API identifier value: 0x88
Response to previous command.
In response to an AT Command message, the module will send an AT Command Response message.
Some commands will send back multiple frames (for example, the ND (Node Discover) and AS (Active
Scan) commands). These commands will end by sending a frame with a status of ATCMD_OK and no
cmdData.
cmdData0x 08
Length ChecksumStart Delimiter Frame Data
Identifier- specific DataAPI Identifier
MSB LSB0x 7E 1 Byt eAPI- specific Structure
Frame ID ( Byte 5)
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 ( Bytes 6 -7)
Command Name - Two
ASCII characters that
identify the AT Command.
Parameter Value (Byte(s) 8-n)
If present, indicates the requested parameter
value to set the given register.
If no characters present, register is queried.
*Length[Bytes]=APIId entifier+FrameID +ATCommand
**“R ”valuewasarbitrarilyselected.
Checksum
0x15
Byte 8
AT Command
Bytes 6-7
Frame ID**
0x52 (R)
Byte 5
0x44 (D) 0x4C (L)
API Identifier
0x08
Byte 4
Start Delimiter
Byte 1
0x7E
Length*
Bytes 2-3
0x00 0x04
*Length[Bytes]=APIId entifier+FrameID+ATCommand+ParameterValue
**“M”valuewasarbitrarilyselected.
Checksum
0x0C
Byte 12
AT Command
Bytes 6-7
0x44 (D) 0x4C (L)
Parameter Value
0x00000FFF
Bytes 8-11
Frame ID**
0x4D (M)
Byte 5
Length*
Bytes 2-3
0x00 0x08
API Identifier
0x08
Byte 4
Start Delimiter
Byte 1
0x7E

Digi XBee Specifications

General

Operating Frequency	2.4 GHz
RF Data Rate	250 kbps
Model	XBee S2C
Category	Control Unit
Operating Voltage	2.1 to 3.6V DC
Operating Temperature	-40 to +85 °C
Interface	UART
Dimensions	24.38 x 27.61 x 9.14 mm