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Operation
Perform a serial firmware update
XBee Wi-Fi RF Module User Guide
40
The Associate LED
The Associate pin (TH pin 15/SMT pin 28) provides an indication of when the device associates with an
access point (AP). To take advantage of these indications, connect an LED to the Associate pin.
To enable the Associate LED functionality, set
to 1; it is enabled by default. If
enabled, the Associate pin is configured as an output.
Use
to override the blink rate of the Associate pin. If you set
LT
to 0, the
device uses the default blink time: 250 ms.
TCP connection indicator
In Transparent mode, only one TCP connection is allowed and you can configure DIO12 (also known as
CD) to indicate whether or not that TCP socket is connected. To enable DIO12, set
to
6
. When so configured, DIO12 outputs a low signal when the TCP socket is connected
and it outputs a high signal when the TCP socket is disconnected. The high signal remains when
operating in UDP mode because there is never be a TCP connection.
Remote Manager connection indicator
and the Associate LED indicate when the device is fully associated with the
access point (AP), but there is another level of connectivity provided by
that
tells whether or not the TCP socket to Digi Remote Manager is connected. The values defined for
DI
are:
n
0
= Connected to Remote Manager
n
1
= Configured, but not yet associated to AP
n
2
= Associated to AP, but not yet connected to Remote Manager
n
3
= Disconnecting from Remote Manager
n
4
= Not configured to connect to Remote Manager
When
DI
is either
2
or
3
, the Associate LED has a different blink pattern that looks like this:
Where the low signal means LED off and the high signal means LED on.
The normal association LED signal alternates evenly between high and low as shown below:
Perform a serial firmware update
Serial firmware updates use the XBee bootloader which ships in all devices. This bootloader allows you
to update the firmware. Normally, the running application can be told to invoke the bootloader
through a command from XCTU. If that command is not available in the currently loaded firmware, the
bootloader includes a modified entry mechanism using pins TH pin 3/SMT pin 4, TH pin 9/SMT pin 10,
and TH pin 16/SMT pin 29 (DIN, DTR, and RTS, respectively).