XB24-BPDK Digi International/Maxstream, XB24-BPDK Datasheet - Page 79

• Manufacturer Part Number: XB24-BPDK
• Description: KIT DEVELOPMENT XBEE SERIES 2
• Manufacturer: Digi International/Maxstream
• Series: XBee™r
• Type: 802.15.4/Zigbeer

Specifications of XB24-BPDK

• Frequency: 2.4GHz
• For Use With/related Products: XBee™ Series 2 Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8. Manufacturing Support
8.1. Interoperability with other EM250 Devices
8.2. Customizing XBee Default Parameters
8.3. XBee EM250 Pin Mappings
8.1.1. Crosstalk Issue
The XBee module can interoperate with other EM250-based devices. The following should be
considered when communicating between a Digi XBee module and another EM250-based device.
The XBee firmware inserts 8 bytes at the beginning of the data payload that represent the 64-bit
address of the source module. Custom devices that transmit to an XBee or receive data from an
XBee should make provisions to manage these 8 address bytes in the payload. Data packets
destined for an XBee module should include the source address of the sending device with the
most significant byte copied first.
The EM250 suffers from a crosstalk issue where data received on a channel that is 12 channels
above or below the current channel appears to be received on the current channel. RF data is
detected on the erroneous channel only if the signal level of the received RF data is around -
30dBm (XBee devices separated by a few feet). For example, RF traffic on channel 0x0B could be
seen on channels 0x0B and 0x17 if its detected signal level is around -30dBm. This could result in
routers or end devices joining a PAN, but reporting an incorrect channel.
The problem can best be avoided by setting the SC (scan channels) bitmask to only include 12
continuous channels. If SC is left at its default value (0x1FFE), the crosstalk issue will never occur.
Once module parameters are determined, Digi can manufacture modules with specific customer-
defined configurations. These custom configurations can lock in a firmware version or set
command values when the modules are manufactured, eliminating the need for customers to
adjust module parameters on arrival. Contact Digi to create a custom configuration.
The following table shows how the GPIO pins on the EM250 map to pins on the XBee ZNet 2.5
module:
Table 8‐011.
XBee ZNet 2.5 Module Pin Number
© 2008 Digi International, Inc.
10
12
13
14
15
11
1
2
3
4
5
6
7
8
9
EM250 Pin
Number
32
33
31
13
41
40
42
43
20
25
21
-
-
-
-
EM250 GPIO
10
15
16
14
13
12
9
8
3
0
-
-
-
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