Technical information

AT+i Commands Overview
1-6 AT+i Commands Reference Manual May 31, 2008
W24 Readiness Indication
This W24 Readiness Indication feature provides an indication of W24's readiness to accept AT+i
commands following a hardware reset. Using this feature, W24 can also notify the host when it is
ready for IP communication.
This functionality is based on two parameters - RRA and RRHW. The RRA parameter can be set
to send a software message to the host, assert a dedicated hardware pin, or do both. The RRHW
parameter specifies which of W24's I/O pins will be asserted.
The hardware pin specified by the RRHW parameter is asserted High immediately after power
up. It will be asserted Low when W24 is ready to receive AT+i commands, and asserted High
again following W24's response to any AT+i command.
Programming W24's Serial Number Into the Flash Memory
You can use the AT+iSNUM command to program the W24 serial number into the flash memory.
This can be done only once.
Syntax: AT+iSNUM=<serial_number>
Programs W24’s serial number into flash memory.
Parameters:
<serial_number> W24’s serial number consisting 8 hexadecimal characters.
The serial number can be assigned only once, while the
current serial number is still FFFFFFFF. Once a serial
number is assigned, it cannot be modified. To find out the
current serial number, use the AT+iRP5 command.
Default: The serial number assigned at the factory.
Result Code:
I/OK If serial_number is a legal hexadecimal string and is being
set for the first time.
I/ERROR(068) Serial number already exists.
AT+iSNUM=? Returns the message “String” followed by I/OK.