Digi XBee Manual

XBee® Wi-Fi RF Modules
© 2013 Digi International, Inc. 61
READ _RESPONSE (0x84):
When a READ command request has been unicast to a node, that node will send a
response in the following format to the source endpoint specified in the requesting
frame.
Field Name Command –Specific Description
GPM_CMD_ID Should be set to READ_RESPONSE (0x84).
GPM_STATUS
A 1 in the least significant bit indicates an error occurred. All
other bits are reserved at this time.
GPM_BLOCK_NUM
Matches the parameter passed in the request frame.
GPM_START_INDEX
GPM_NUM_BYTES The number of bytes in the GPM_DATA field.
GPM_DATA The bytes read from the GPM block specified.
Example:
To read 15 bytes of previously written data from flash block 22 of a target radio with
serial number of 0x0013a200407402ac, a READ packet should be formatted as follows
(spaces added to delineate fields):
7E 001C 11 01 0013A200407402AC FFFE E6 E6 0023 C105 00 C0 04 00 0016 0000 000F 3B
Assuming all transmissions were successful and that flash block 22 was previously
written with incrementing data, the following API packets would be output the source
node's serial interface:
7E 0007 8B 01 FFFE 00 00 00 76
7E 0029 91 0013A200407402AC FFFE E6 E6 0023 C105 C1 84 00 0016 0000 000F
0102030405060708090A0B0C0D0E0F C3
FIRMWARE_VERIFY (0x05) and FIRMWARE_VERIFY_AND_INSTALL (0x06):
The FIRMWARE_VERIFY and FIRMWARE_VERIFY_AND_INSTALL commands are used
when remotely updating firmware on a module. Remote firmware upgrades are covered
in detail in the next section. These commands check if the General Purpose Memory
contains a valid over-the-air update file. For the FIRMWARE_VERIFY_AND_INSTALL
command, if the GPM contains a valid firmware image then the module will reset and
begin using the new firmware.
Field Name Command –Specific Description
GPM_CMD_ID
Should be set to FIRMWARE_VERIFY (0x05) or
FIRMWARE_VERIFY_AND_INSTALL (0x06).
GPM_OPTIONS
There are currently no options defined for the ERASE command.
Set this field to 0.
GPM_BLOCK_NUM
These fields are unused for this command. Set to 0.
GPM_START_INDEX
GPM_NUM_BYTES
GPM_DATA This field is unused for this command.

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