Digi XBee 3 Cellular LTE-M, User Manual, Page: 41 / 331

Get started with MicroPython Exit MicroPython mode
Digi XBee® 3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide 41
if uart_data:
sys.stdout.buffer.write(uart_data)
stdin_data = sys.stdin.buffer.read(-1)
if stdin_data:
u.write(stdin_data)
time.sleep_ms(5)
u = uart_init()
uart_relay(u)
You only need to call uart_init() once.
Call uart_relay() to pass data between the UARTs.
Send Ctrl-C to exit relay mode.
When done, call u.close() to close the secondary UART.
Exit MicroPython mode
To exit MicroPython mode:
1. In the XCTU MicroPython Terminal, click the green Close button .
2. Click Close at the bottom of the terminal to exit the terminal.
3. In XCTU's Configuration working mode , change AP API Enable to another mode and click
the Write button . We recommend changing to Transparent mode [0] , as most of the
examples use this mode.
Other terminal programs
If you do not use the MicroPython Terminal in XCTU, you can use other terminal programs to
communicate with the XBee Smart Modem. If you use Microsoft Windows, follow the instructions for
Tera Term, if you use Linux, follow the instructions for picocom. To download these programs:
n
Tera Term for Windows; see https://ttssh2.osdn.jp/index.html.en .
n
Picocom for Linux; see https://developer.ridgerun.com/wiki/index.php/Setting_up_Picocom_-_
Ubuntu and for the source code and in-depth information https://github.com/npat-
efault/picocom .
Tera Term for Windows
With the XBee Smart Modem in MicroPython mode ( AP = 4 ), you can access the MicroPython prompt
using a terminal.
1. Open Tera Term. The Tera Term: New connection window appears.
2. Click the Serial radio button to select a serial connection.
3. From the Port: drop-down menu, select the COM port that the XBee Smart Modem is
connected to.
4. Click OK . The COMxx - Tera Term VT terminal window appears and Tera Term attempts to
connect to the device at a baud rate of 9600 b/s. The terminal will not allow communication