Getting started with the XBee Smart Modem Development Kit Cellular service
Digi XBee3 Cellular LTE-M Global Smart Modem User Guide
17
Number Item Description
1 Programmingheader Header used to program XBee programmable devices.
2 Self power module
Advanced users only—voids the warranty. Depopulate R31 to
power the device using V+ and GND from J2 and J5. You can
connect sense lines to S+ and S- for sensing power supplies.
CAUTION: Voltage is not regulated. Applying the incorrect
voltage can cause fire and serious injury.
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3 Current testing Depopulating R31 allows a current probe to be inserted across P6
terminals. The current though P6/R31 powers the device only.
Other supporting circuitry is powered by a different trace.
4 Loopback jumper Populating P8 with a loopback jumper causes serial transmissions
both from the device and from the USB to loopback.
5 DC barrel plug: 6-20V Greater than 500 mA loads require a DC supply for correct
operation. Plug in the external power supply prior to the USB
connector to ensure that proper USB communications are not
interrupted.
6 LED indicator
Yellow: Modem sending serial/UART data to host.
Green: Modem receiving serial/UART data from host.
Red: Associate.
7 USB
8 RSSI indicator
See RSSI PWM. On the XBIB-U, more lights are better.
9 User buttons Connected to DIO lines for user implementation.
10 Reset button
11 SPI power Connect to the power board from 3.3 V.
12 SPI Only used for surface-mount devices.
13 Indicator LEDs
DS5: ON/SLEEP
DS2: DIO12, the LED illuminates when driven low.
DS3: DIO11, the LED illuminates when driven low.
DS4: DIO4, the LED illuminates when driven low.
14 Through-hole XBee
sockets
15 20-pin header Maps to standard through-hole XBee pins.
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Powering the board with J2 and J5 without R31 removed can cause shorts if the USB or barrel plug power are
connected. Applying too high a voltage destroys electronic circuitry in the device and other board components
and/or can cause injury.
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