XBP09-DPUIT-156 Digi International, XBP09-DPUIT-156 Datasheet - Page 18

• Manufacturer Part Number: XBP09-DPUIT-156
• Description: MODULE XBEE PRO W/U.FL
• Manufacturer: Digi International
• Series: XBEE-PRO™r

Specifications of XBP09-DPUIT-156

• Frequency: 902MHz ~ 928MHz
• Data Rate - Maximum: 156kbps
• Modulation Or Protocol: FHSS
• Applications: ISM
• Power - Output: 17dBm (50mW)
• Sensitivity: -100dBm
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Receiving: 80mA
• Current - Transmitting: 210mA
• Data Interface: PCB, Through Hole
• Antenna Connector: U.FL
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 602-1168

XBee‐PRO® 900 RF Modules
Device Placement
Link Testing
RSSI Indicators
For a mesh network installation to be successful, the installer must be able to determine where to
place individual XBee devices to establish reliable links throughout the mesh network.
A good way to measure the performance of a mesh network is to send unicast data through the
network from one device to another to determine the success rate of many transmissions. To
simplify link testing, the modules support a loopback cluster ID (0x12) on the data endpoint
(0xE8). Any data sent to this cluster ID on the data endpoint will be transmitted back to the
sender. This is shown in the figure below:
The configuration steps to send data to the loopback cluster ID depend on the AP setting:
AT Configuration (AP=0)
To send data to the loopback cluster ID on the data endpoint of a remote device, set the CI
command value to 0x12. The SE and DE commands should be set to 0xE8 (default value). The DH
and DL commands should be set to the address of the remote (0 for the coordinator, or the 64-bit
address of the remote). After exiting command mode, any received serial characters will be
transmitted to the remote device, and returned to the sender.
API Configuration (AP=1 or AP=2)
Send an Explicit Addressing ZigBee Command API frame (0x11) using 0x12 as the cluster ID and
0xE8 as the source and destination endpoint. Data packets received by the remote will be echoed
back to the sender.
It is possible to measure the received signal strength on a device using the DB command. DB
returns the RSSI value (measured in –dBm) of the last received packet. However, this number can
be misleading. The DB value only indicates the received signal strength of the last hop. If a
transmission spans multiple hops, the DB value provides no indication of the overall transmission
path, or the quality of the worst link – it only indicates the quality of the last link and should be
used sparingly. XBee-PRO 900 modules also have the limitation that only RSSI values near the
sensitivity level of the radio are accurately reported. Signals received which are stronger than
approximately -85 dBm will be reported as approximately -85dBm.
© 2009 Digi International, Inc.
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