Enter Command Mode; Troubleshooting; Send At Commands - Digi XBee 3 ZigBee User Manual

Modes

Enter Command mode

To get a device to switch into Command mode, you must issue the following sequence: +++ within one
second. There must be at least one second preceding and following the +++ sequence. Both the
command character (CC) and the silence before and after the sequence (GT) are configurable. When
the entrance criteria are met the device responds with OK\r on UART signifying that it has entered
Command mode successfully and is ready to start processing AT commands.
If configured to operate in
Zigbee RF Module knows to stop sending data and start accepting commands locally.
Note Do not press Return or Enter after typing +++ because it interrupts the guard time silence and
prevents you from entering Command mode.
When the device is in Command mode, it listens for user input and is able to receive AT commands on
the UART. If CT time (default is 10 seconds) passes without any user input, the device drops out of
Command mode and returns to the previous operating mode. You can force the device to leave
Command mode by sending
You can customize the command character, the guard times and the timeout in the device's
configuration settings. For more information,
Timeout) and GT (Guard

Troubleshooting

Failure to enter Command mode is often due to baud rate mismatch. Ensure that the baud rate of the
connection matches the baud rate of the device. By default,
There are two alternative ways to enter Command mode:
A serial break for six seconds enters Command mode. You can issue the "break" command
n
from a serial console, it is often a button or menu item.
Asserting DIN (serial break) upon power up or reset enters Command mode. XCTU guides you
n
through a reset and automatically issues the break when needed.
Note You must assert RTS for both of these methods, otherwise the device enters the bootloader.
Both of these methods temporarily set the device's baud rate to 9600 and return an OK on the UART
to indicate that Command mode is active. When Command mode exits, the device returns to normal
operation at the baud rate that BD is set to.

Send AT commands

Once the device enters Command mode, use the syntax in the following figure to send AT commands.
Every AT command starts with the letters AT, which stands for "attention." The AT is followed by two
characters that indicate which command is being issued, then by some optional configuration values.
To read a parameter value stored in the device's register, omit the parameter field.
Digi XBee® 3 Zigbee® RF Module
Transparent operating mode, when entering Command mode the XBee 3
CN (Exit Command mode).
see CC (Command Character), CT (Command Mode
Times).
Command mode
BD (UART Baud Rate) = 3 (9600 b/s).
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