Digi XBee User manual

User Guide
XBee/XBee-PRO®
900HP RS-232/RS-485/USB RF Modem

XBee/XBee-PRO 900HP RF Modem User Guide 2
XBee/XBee-PRO 900HP RF Modem User Guide—90002200
Product documentation
To find up-to-date documentation for all Digi products, visit www.digi.com/documentation.
To provide feedback on this documentation, send your comments to techc[email protected]om.
Trademarks and copyright
Digi, Digi International, and the Digi logo are trademarks or registered trademarks in the United States and other
countries worldwide. All other trademarks mentioned in this document are the property of their respective owners.
© 2016 Digi International. All rights reserved.
Disclaimers
Information in this document is subject to change without notice and does not represent a commitment on the part
of Digi International. Digi provides this document “as is,” without warranty of any kind, expressed or implied,
including, but not limited to, the implied warranties of fitness or merchantability for a particular purpose. Digi may
make improvements and/or changes in this manual or in the product(s) and/or the program(s) described in this
manual at any time.
Warranty
To view product warranties online, visit www.digi.com/howtobuy/terms.
Customer support
Digi offers multiple technical support plans and service packages to help our customers get the most out of their Digi
product. For information on Technical Support plans and pricing, please contact us at 952.912.3456 or visit
www.digi.com/support.
If you have a customer account, sign in to the Customer Support Web Portal at www.digi.com/support/eservice
Revision Date Description
A December, 2013 Baseline release.
B May, 2016 Updated to include new Customer Support information. Corrected the USB
connector pin assignments and implementation table.

XBee/XBee-PRO 900HP RF Modem User Guide 3
Contents
Overview of the 900HP RF Modem
Features of the 900HP RF Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Worldwide acceptance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications of the 900HP RF Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
External interface of the 900HP RF Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RF Modem symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Interfacing protocol
RS-232 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
RS-232 pin signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
RS-232 wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
RS-485 (2-wire) operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
RS-485 pin signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
RS-485 wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
RS-485 (4-wire) operation and RS-422 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
RS-485 pin signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
RS-485 wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
RS-485/422 connection guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
USB operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
USB pin signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Agency certifications
FCC (United States) certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Labeling requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
FCC notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Limited modular approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FCC-approved antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
IC (Industry Canada) certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

XBee/XBee-PRO 900HP RF Modem User Guide 4
Overview of the 900HP RF Modem
The XBee-PRO 900HP RF Modem is a small, low-power solution that uses the XBee-PRO 900HP 900 MHz RF Module in
an enclosure to communicate with systems using RS-232, RS-485, and USB interfaces. It allows you to easily make
your existing wired systems wireless simply by connecting to this product.
When a system is connected to the XBee-PRO 900HP RF Modem, it can transmit and receive data from multiple radios
on the same wireless network. This is achieved by using Digi’s XBee-PRO 900HP RF Module.
This manual is not a comprehensive manual that provides a full description of the 900HP RF Modem. This manual
only covers the interfaces needed to communicate with the 900HP 900 MHz RF Module. For an extensive guide on use
of the 900HP 900 MHz RF Module, see the XBee-PRO 900 HP/XBee-PRO XSC RF Modules User Guide.
Features of the 900HP RF Modem
The following table highlights the key features of the XBee 900HP RF Modem:
Long range data integrity Low power
Range
Indoor/Urban: 200kbps: Up to 1000' (305 m), 10kbps: Up
to 2000' (610m)
Outdoor line-of-sight: 200kbps: Up to 4 miles (6.5km),
10kbps: Up to 9 miles (15.5km)
Transmit power: Up to 24 dBm (250 mW) (software
selectable)
Receiver sensitivity: -101 dBm (200kbps), -110 dBm
(10kbps)
RF data rate: 200kbps, 10kbps
Receive current: 60 mA (@9V)
Transmit current: 140 mA (@9V)

Specifications of the 900HP RF Modem
XBee/XBee-PRO 900HP RF Modem User Guide 5
Worldwide acceptance
FCC Approved (U.S.A). See Agency certifications on page 21 for FCC requirements.
Systems that include XBee®/XBee-PRO® 900HP RF modems inherit Digi Certifications.
ISM (Industrial, Scientific and Medical) 900 GHz frequency band
Manufactured under ISO 9001:2000 registered standards
XBee®/XBee-PRO® 900HP (900 MHz) RF Modems are approved for use in U.S, Canada, and Australia.
Specifications of the 900HP RF Modem
The following table highlights the specifications of the XBee-PRO 900HP RS-232/RS-485/USB RF Modem.
Advanced networking and security Easy to use
True peer-to-peer (no “master” required) communications.
Mesh, point-to-point and point-to-multipoint topologies
supported.
Retries and acknowledgments.
8 hopping channels, each with over 65,000 available
network addresses.
FHSS (Frequency Hopping Spread Spectrum).
No configuration required for out-of-the-box RF data
communications
Free XCTU software (Testing and configuration software)
RS-232 and RS-485 variants configurable via the mini USB port
Advanced configurations available through standard AT and
binary commands
Built in RS-232/RS-485/USB interfacing
Small form factor
Software-selectable serial interface baud rates
Support for multiple data formats (parity, start and stop bits,
etc.)
Free and unlimited Technical Support
Specification XBee-PRO
Performance
Indoor/Urban Range 200kbps: Up to 1000 ft (305m)10kbps: Up to 2000 ft (610m)
Outdoor line-of-sight Range 200kbps: Up to 4 miles (6.5km) w/ 2.1 dB dipole antenna
10kbps: Up to 9 miles (15.5km) w/ 2.1dB dipole antenna
Transmit power output Up to 24 dBm (250 mW) software selectable
RF Data Rate (High) 200kbps
RF Data Rate (Low) 10kbps
Interface data rate 9600-230400kbps (Software selectable, includes non-standard baud
rates)
Receiver sensitivity -101 dBm (200kbps), -110 dBm (10kbps)
Networking and security

Specifications of the 900HP RF Modem
XBee/XBee-PRO 900HP RF Modem User Guide 6
Frequency 902-928MHz (located in the 900MHz ISM Band)
Spread spectrum Frequency hopping
Supported network topologies Mesh, point-to-point, point-to-multipoint, peer-to-peer
Antenna
Connector RPSMA (reverse polarity SMA)
Impedance 50 ohms unbalanced
Power requirements
Power supply 7-30 VDC
Receive current 60 mA (@9V)
Transmit current 140 mA (@9V)
Physical properties
Size 4.500” x 2.750” x 1.125” (11.4cm x 7.0cm x 2.9cm)
Weight 5.25 oz. (150 g)
Data connection Female DB-9, RS-485/422 screw terminal, USB Type B, USB Mini-B
Operating temperature -40 - 85º C (Industrial)
Certifications (partial list)1
United States (FCC Part 15.247) MCQ-XB900HP
Industry Canada (IC) 1846A-XB900HP
Australia RCM
RoHS Compliant
1. See Agency certifications on page 21 for region-specific certification requirements.
Specification XBee-PRO

External interface of the 900HP RF Modem
XBee/XBee-PRO 900HP RF Modem User Guide 7
External interface of the 900HP RF Modem
Front view of the RS-232 interface Description
1-01a. RS-232 Serial Port
Standard female DB-9
1-01b. RS-232 Power Connector
7-30 VDC power connector
1-01c. RS-232 Reset Button
The reset button resets (re-boots) the XBee-PRO 900HP RF
Modem. This button only applies when using the configuration
tabs of Digi’s XCTU Software.
Front view of the RS-485 interface Description
1-03a. RS-485 Serial Port
Phoenix 6-pin connector.
1-03b. RS-485 Power Connector
7-30 VDC power connector.
1-03c. RS-485 DIP Switch
120 ohms termination for the receiving differential pairs if switch
is in the up position. Switch 1 is for half duplex (2 wire)
termination. Switch 2 is for full duplex (4 wire) termination.
1-03d. RS-485 Reset Button
The reset button resets (re-boots) the XBee-PRO 900HP RF
Modem. This button only applies when using the configuration
tabs of Digi’s XCTU Software.

External interface of the 900HP RF Modem
XBee/XBee-PRO 900HP RF Modem User Guide 8
Back view of the RS-485 interface Description
1-04a. RS-485 RSSI LEDs
RSSI LEDs indicate the amount of fade margin present in an active
wireless link. Fade margin is defined as the difference between the
incoming signal strength and the modem's receiver sensitivity.
3 LEDs ON = Very Strong Signal (> 30 dB fade margin)
2 LEDs ON = Strong Signal (>20 dB fade margin)
1 LED ON = Moderate Signal (>10 dB fade margin)
0 LED ON = Weak Signal (<10 dB fade margin)
1-04b. RS-485 I/O and Power LEDs
LEDs indicate RF modem activity as follows:
Yellow (top LED) = Serial Data Out (to host)
Green (middle) = Serial Data In (from host)
Red (bottom) = Power/TX Indicator (the red light is on when
powered, off briefly during RF transmission)
1-04c. RS-485 Commissioning Push Button
The commissioning push button provides a variety of simple
functions to aid in deploying devices in a network. See
“Commissioning Push-button” in the XBee-PRO 900HP/XBee-PRO
XSC RF Modules Product Manual for more detail.
1-04d. RS-485 USB Mini-B Port
When the USB Mini-B is plugged in, all RS-485 communications to
and from the XBee are disabled. The USB is to serve as a
configuration port. The XBee should not transmit if USB is plugged
in.
1-04e. RS-485 Antenna Port
The antenna port is a 50ΩRF signal connector for connecting to an
external antenna. The connector type is RPSMA (Reverse Polarity
SMA) female. The connector has threads on the outside of a barrel
and a male center conductor.

External interface of the 900HP RF Modem
XBee/XBee-PRO 900HP RF Modem User Guide 9
Back view of the RS-232 interface Description
1-02a. RS-232 RSSI LEDs
RSSI LEDs indicate the amount of fade margin present in an active
wireless link. Fade margin is defined as the difference between the
incoming signal strength and the modem's receiver sensitivity.
3 LEDs ON = Very Strong Signal (> 30 dB fade margin)
2 LEDs ON = Strong Signal (>20 dB fade margin)
1 LED ON = Moderate Signal (>10 dB fade margin)
0 LED ON = Weak Signal (<10 dB fade margin)
1-02b. RS-232 I/O and Power LEDs
LEDs indicate RF modem activity as follows:
Yellow (top LED) = Serial Data Out (to host)
Green (middle) = Serial Data In (from host)
Red (bottom) = Power/TX Indicator (the red light is on when
powered, off briefly during RF transmission)
1-02c. RS-232 Commissioning Push Button
The commissioning push button provides a variety of simple
functions to aid in deploying devices in a network. See
“Commissioning Push-button” in the XBee-PRO 900HP/XBee-PRO
XSC RF Modules Product Manual for more detail.
1-02d. RS-232 USB Mini-B Port
When the USB Mini-B is plugged in, all RS-232 communications to
and from the XBee are disabled. The USB is to serve as a
configuration port. The XBee should not transmit when the USB is
plugged in.
1-02e. RS-232 Antenna Port
The antenna port is a 50ΩRF signal connector for connecting to an
external antenna. The connector type is RPSMA (Reverse Polarity
SMA) female. The connector has threads on the outside of a barrel
and a male center conductor.

External interface of the 900HP RF Modem
XBee/XBee-PRO 900HP RF Modem User Guide 10
Front view of the USB interface Description
1-05a. USB Port
Type B USB port.
1-05b. USB Power Connector
7-30 VDC power connector.
1-05c. USB Reset Button
The reset button resets (re-boots) the XBee-PRO 900HP RF
Modem. This button only applies when using the configuration
tabs of Digi’s XCTU Software.
Back view of the USB interface Description
1-06a. USB RSSI LEDs
RSSI LEDs indicate the amount of fade margin present in an active
wireless link. Fade margin is defined as the difference between the
incoming signal strength and the modem's receiver sensitivity.
3 LEDs ON = Very Strong Signal (> 30 dB fade margin)
2 LEDs ON = Strong Signal (>20 dB fade margin)
1 LED ON = Moderate Signal (>10 dB fade margin)
0 LED ON = Weak Signal (<10 dB fade margin)
1-06b. USB I/O and Power LEDs
LEDs indicate RF modem activity as follows:
Yellow (top LED) = Serial Data Out (to host)
Green (middle) = Serial Data In (from host)
Red (bottom) = Power/TX Indicator (the red light is on when
powered, off briefly during RF transmission)
1-06c. USB Commissioning Push Button
The commissioning push button provides a variety of simple
functions to aid in deploying devices in a network. See
“Commissioning Push-button” in the XBee-PRO 900HP/XBee-PRO
XSC RF Modules Product Manual for more detail.
1-06d. USB Antenna Port
The antenna port is a 50ΩRF signal connector for connecting to an
external antenna. The connector type is RPSMA (Reverse Polarity
SMA) female. The connector has threads on the outside of a barrel
and a male center conductor.

RF Modem symbols
XBee/XBee-PRO 900HP RF Modem User Guide 11
RF Modem symbols
The following symbols are found on top of the RF Modem. The description of the symbol is next to the symbol.

XBee/XBee-PRO 900HP RF Modem User Guide 12
Interfacing protocol
The XBee-PRO 900HP RS-232/485/USB RF Modem supports the following interfacing protocols:
•RS-232
•RS-485 (2-wire) half-duplex
•RS-485 (4-wire) and RS-422
•USB
RS-232 operation
RS-232 pin signals
The following figure shows the pins used on the female RS-232 (DB-9) serial connector:
The following table describesthe RS-232 pin assignments and implementation:
DB-9 pin RS-232 Name Description Implementation
1 DCD Data-Carrier-Detect Connected to DSR (pin 6)
2 RXD Received Data Serial data exiting the RF modem (from host)
3 TXD Transmitted Data Serial data entering into the RF modem (from host)

RS-232 operation
XBee/XBee-PRO 900HP RF Modem User Guide 13
RS-232 wiring diagram
The following figure shows the RS-232 Device DTE Device (male DB-9 connector) wired to a DCE RF modem (female
DB-9) XBee-PRO RF Modem:
4 DTR Data-Terminal-Ready 2 – 0xFFFF [x 100 msec]
5 GND Ground Signal 0x20 – 0x7F
6 DSR Data-Set-Ready 0 - 4
7RTS
/ CMD Request-to-Send/
Command Mode
RTS (request-to-send) flow control: By default, this pin is not
used. To configure this pin to regulate the flow of serial data
exiting the modem, refer to the Serial Communications and
RT command section.
CMD: Refer to Binary Commands and RT Command Sections
to enable binary command programming.
8 CTS Clear-to-Send CTS (clear-to-send) flow control –When pin is driven low,
UART host is permitted to send serial data to the modem.
Refer to the Serial Communications and CS Command
sections for more information.
9 RI Ring Indicator Optional power input (protection circuitry to prevent back
flow from other power sources internal to the board)
DB-9 pin RS-232 Name Description Implementation

RS-485 (2-wire) operation
XBee/XBee-PRO 900HP RF Modem User Guide 14
DCE RF Modem to a DCE RS-232 device
The following figure shows the DCE RF Modem (female DB-9 connector) wired to an RS-232 DCE device (male DB-9)
XBee-PRO RF Modem:
Sample wireless connection: DTE <--> DCE DCE <--> DCE
The following figure shows a typical wireless link between DTE and DCE devices:
RS-485 (2-wire) operation
XCTU that with the RS-485 variant of the 900HP RF Modem, the RF Modem is defaulted with the D7 command (AT
parameter) to 7. This parameter controls the TX enable signal and allows the modem to output any data in the DO
buffer to the host device for the RS-485 interface. In the event that the parameter is accidentally changed, which
would halt RS-485 communication, a USB mini cable should be plugged into the modem to reconfigure it. You can
reconfigure by using Digi’s XCTU.
With the USB plugged in:
1. Open XCTU and select the Com port of the USB.
2. Select the Terminal tab and type '+++'. The system will respond with 'OK'.

RS-485 (2-wire) operation
XBee/XBee-PRO 900HP RF Modem User Guide 15
3. Type “ATD77” then <Enter>, and the system will respond with 'OK'. Type “ATWR” then <Enter>, and the system will
respond with “OK”.
4. Type “ATCN” then <Enter> to exit command mode, and the system will respond with “OK”.
5. Unplug the USB and return to the existing RS-485 interface. The 900HP RF Modem is now ready to communicate in
RS-485 model.
Note Failure to enter AT Command Mode is most commonly due to baud rate mismatch. Ensure the “Baud" setting
on the “PC Settings” tab matches the BD (Interface Data Rate) setting of the RF modem (by default, BD
parameter = 3, which is associated with 9600 baud).
RS-485 pin signals
The following figure shows the pins used on the RS-485 (2 wire) Phoenix 6-pin connector:
The following figure shows the pins used on the RS-485 (2 wire) Phoenix 6-pin connector:
Phoenix 6 pin RS-485 name Description Implementation
1 TX/RX+ Negative Data Line Transmit serial data to and from the RF modem
2 TX/RX- Positive Data Line Transmit serial to and from the RF modem
5 GND Ground Signal Ground
6 PWR Power Signal Optional power input (protection circuitry to prevent
back flow from other power sources internal to the
board)
3, 4 Not Used

RS-485 (4-wire) operation and RS-422 operation
XBee/XBee-PRO 900HP RF Modem User Guide 16
RS-485 wiring diagram
The following figure shows the RF Modem in an RS-485 (2 wire) half duplex:
RS-485 (4-wire) operation and RS-422 operation
XCTU that with the RS-485 variant of the 900HP RF Modem, the RF Modem is defaulted with the D7 command (AT
parameter) to 7. This parameter controls the TX enable signal and allows the modem to output any data in the DO
buffer to the host device for the RS-485/422 interface. In the event that the parameter is accidentally changed, which
would halt RS-485 communication, a USB mini cable should be plugged into the modem to reconfigure it. You can
reconfigure by using Digi's XCTU.
With the USB plugged in:
1. Open XCTU and select the Com port of the USB.
2. Select the Terminal tab and type “+++”. The system will respond with “OK”.
3. Type “ATD77” then <Enter>, and the system will respond with “OK”.
4. Type “ATWR” then <Enter>, and the system will respond with “OK”.
5. Type “ATCN” then <Enter> to exit command mode, and the system will respond with “OK”.
6. Unplug the USB and return to the existing RS-485/422 interface. The 900HP RF Modem is now ready to
communicate in RS-485 mode.
Note Failure to enter AT Command Mode is most commonly due to baud rate mismatch. Ensure the 'Baud' setting
on the “PC Settings” tab matches the BD (Interface Data Rate) setting of the RF modem (by default, BD
parameter = 3, which is associated with 9600 baud).

RS-485 (4-wire) operation and RS-422 operation
XBee/XBee-PRO 900HP RF Modem User Guide 17
RS-485 pin signals
The numbers in the following figure correspond to the Phoenix 6 pins listed in the table that follows the figure:
The following table describes the RS-485 (4-wire) 6-pin connector pin assignments and implementation:
Phoenix 6 pin RS-485 name Description Implementation
1 TX+ Transmit Positive Serial data sent from RF modem
2 TX- Transmit Negative Data Line Serial data received by the RF modem
5 RX+ Receive Positive Data Line Serial data received the RF modem
4 RX- Receive Negative Data Line Serial data received by the RF modem
5 GND Ground Signal Ground
6 PWR Power Signal Optional power input (protection circuitry to prevent
back flow from other power sources internal to the
board)

RS-485 (4-wire) operation and RS-422 operation
XBee/XBee-PRO 900HP RF Modem User Guide 18
RS-485 wiring diagrams
The following figure shows the RF Modem in an RS-485 (4-wire) environment:
The following figure shows the RF Modem in an RS-422 environment:
RS-485/422 connection guidelines
The RS-485/422 protocol provides a solution for wired communications that can tolerate high noise and push signals
over long cable lengths. RS-485/422 signals can communicate as far as 4000 feet (1200 m). RS-232 signals are suitable
for cable distances up to 100 feet (30.5 m).

USB operation
XBee/XBee-PRO 900HP RF Modem User Guide 19
RS-485 offers multi-drop capability in which up to 32 nodes can be connected. The RS-422 protocol is used for point-
to-point communications.
Suggestions for integrating the 900HP RF Modem with the RS-485/422 protocol: Twisted pair cabling is used for the
positive and negative data lines. An Ethernet cable is good for twisted pairs.
When using Ethernet twisted pair cabling:
Select wires so that TX+ and TX- are connected to a twisted pair. Likewise, select wires so that RX+ and RX- are
connected to a twisted pair. (For example, tie the green and white/green wires to TX+ and TX). This reduces the
amount of noise on the data line.
USB operation
Note that when a Mini-USB cable is plugged into the 900HP RF Modem, communication to and from the RS-232
interface and the RS-485/422 is halted. USB communications take precedence over all other interfaces when you plug
it in. To restore communication with other interfaces, the USB cable should be unplugged.
Note The Mini-B USB connector is intended as a configuration port. The RF Modem should not transmit data when
the Mini USB cable is connected.
USB pin signals
The following figure shows the pins used on the Type B USB connector:

USB operation
XBee/XBee-PRO 900HP RF Modem User Guide 20
The following figure shows type B USB connector pin assignments and implementation:
The following figure shows the pins used on the Mini-B USB connector:
The following table describes the Mini-B USB connector pin assignments and implementation:
Phoenix 6 pin Name Description Implementation
1 VBUS Power Power with external jack
2 D- Negative Data Line Transmit data to and from the RF modem
5 D+ Positive Data Line Transmit data to and from the RF modem
4 GND Ground Signal Ground
Pin Name Description Implementation
1 VBUS Power Power the RF modem
2 D- Negative Data Line Transmit data to and from the RF modem
5 D+ Positive Data Line Transmit data to and from the RF modem
4 ID Permits distinction of host connection from
slave connection
Not connected
5 GND Ground Signal Ground