User Manual
XBee® Wi-Fi RF Modules
© 2012 Digi International, Inc. 53
7E 001A 91 0013A200407402AC FFFE E6 E6 0023 C105 C1 81 00 002A 0000 0000 39
WRITE (0x02) and ERASE_THEN_WRITE (0x03):
The WRITE command writes the specified bytes to the GPM location specified. Before
writing bytes to a GPM block it is important that the bytes have been erased previously.
The ERASE_THEN_WRITE command performs an ERASE of the entire GPM block
specified with the GPM_BLOCK_NUM field prior to doing a WRITE.
Field Name Command –Specific Description
GPM_CMD_ID Should be set to WRITE (0x02) or ERASE_THEN_WRITE (0x03).
GPM_OPTIONS
There are currently no options defined for the ERASE command.
Set this field to 0.
GPM_BLOCK_NUM Set to the index of the GPM block that should be written.
GPM_START_INDEX
Set to the byte index within the GPM block where the given data
should be written.
GPM_NUM_BYTES
Set to the number of bytes specified in the GPM_DATA field. Only
one GPM block can be operated on per command. For this
reason, GPM_START_INDEX + GPM_NUM_BYTES cannot be
greater than the GPM block size. It is also important to remember
that the number of bytes sent in an explicit API frame (including
the GPM command fields) cannot exceed the maximum payload
size of the radio. The maximum payload size can be queried with
the NP AT command.
GPM_DATA The data to be written.
WRITE _RESPONSE (0x82) and ERASE_THEN_WRITE_RESPONSE(0x83):
When a WRITE or ERASE_THEN_WRITE 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 WRITE_RESPONSE (0x82) or
ERASE_THEN_WRITE_RESPONSE (0x83).
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. For this command,
this field will be set to 0.
GPM_DATA No data bytes should be specified for this command.
Example:
To write 15 bytes of incrementing data to flash block 22 of a target radio with serial
number of 0x0013a200407402ac, a WRITE packet should be formatted as follows
(spaces added to delineate fields):
7E 002B 11 01 0013A200407402AC FFFE E6 E6 0023 C105 00 C0 02 00 0016 0000 000F
0102030405060708090A0B0C0D0E0F C5