Digi XBee 3 User Manual

SPI operation Force UART operation
Digi XBee® 3 Cellular LTE Cat 1 AT&T Smart Modem User Guide
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Force UART operation
If you configure a device with only the SPI enabled and no SPI master is available to access the SPI
slave port, you can recover the device to UART operation by holding DIN / CONFIG low at reset time.
DIN/CONFIG forces a default configuration on the UART at 9600 baud and brings up the device in
Command mode on the UART port. You can then send the appropriate commands to the device to
configure it for UART operation. If you write those parameters, the device comes up with the UART
enabled on the next reset.
Data format
SPI only operates in API mode 1. The XBee Smart Modem does not support Transparent mode or API
mode 2 (which escapes control characters). This means that the AP configuration only applies to the
UART, and the device ignores it while using SPI. The reason for this operation choice is that SPI is full
duplex. If data flows in one direction, it flows in the other. Since it is not always possible to have valid
data flowing in both directions at the same time, the receiver must have a way to parse out the valid
data and to ignore the invalid data.
The XBee Smart Modem sends 0xFF when there is no data to send to the host.

Digi XBee 3 Specifications

General

Model	XBee 3
Category	Modem
Frequency Bands	2.4 GHz, 868 MHz, 900 MHz
Interface	UART, SPI, I2C
Operating Temperature	-40° C to +85° C
Power Supply	2.1V to 3.6V
Antenna	External or onboard
Transmit Power	up to 20 dBm
Security	AES encryption
Protocols	Zigbee, 802.15.4, DigiMesh

Summary

Getting Started with the XBee Smart Modem

Connect Hardware and Install XCTU

Step-by-step instructions for connecting hardware and installing XCTU utility.

Update Firmware and Check Connection

Procedures for updating device firmware and verifying cellular connection status.

XBee Connection Examples

Getting Started with MicroPython

MicroPython Basics and Setup

Introduction to MicroPython and setting up the environment using XCTU.

MicroPython Examples

Update the Firmware

Plan for Firmware Updates

Update Device and Cellular Firmware

Procedures for updating device and cellular firmware using XCTU.

Update Telit Modem Firmware with XFP Utility

Instructions for updating the Telit modem firmware using the XFP utility.

AT Commands Reference

Special, Cellular, and Network Commands

Reference for special, cellular, and network configuration AT commands.

I/O, Sleep, and Mode Commands

Configuration commands for I/O settings, sleep modes, and operating modes.

File System, BLE, Socket, and API Commands

Commands for file system, BLE, sockets, and API frame management.

Troubleshooting Guide

Serial Port and Driver Issues

macOS Java Errors and Bypass Mode Issues

Network, SMS, and Baud Rate Troubleshooting