Digi XBee User Manual download pdf (Page 2)

XBee®/XBee‐PRO®ZBRFModules

©2010DigiInternational,Inc. 129

Networking

NetworkingCommands

AT

Command

Name and Description

Node

Type

Parameter Range Default

Operating Channel. Read the channel number used for transmitting and receiving

between RF modules. Uses 802.15.4 channel numbers. A value of 0 means the device

has not joined a PAN and is not operating on any channel.

CRE

XBee

0, 0x0B - 0x1A

(Channels 11-26)

XBee-PRO (S2)

0, 0x0B - 0x18

(Channels 11-24)

XBee-PRO (S2B)

0, 0x0B - 0x19

(Channels 11-25)

[read-only]

Extended PAN ID. Set/read the 64-bit extended PAN ID. If set to 0, the coordinator will

select a random extended PAN ID, and the router / end device will join any extended

PAN ID. Changes to ID should be written to non-volatile memory using the WR

command to preserve the ID setting if a power cycle occurs.

CRE

0 -

0xFFFFFFFFFFFFFFFF

Operating Extended PAN ID. Read the 64-bit extended PAN ID. The OP value reflects

the operating extended PAN ID that the module is running on. If ID > 0, OP will equal ID.

CRE

0x01 -

0xFFFFFFFFFFFFFFFF

[read-only]

Maximum Unicast Hops. Set / read the maximum hops limit. This limit sets the

maximum broadcast hops value (BH) and determines the unicast timeout. The timeout

is computed as (50 * NH) + 100 ms. The default unicast timeout of 1.6 seconds

(NH=0x1E) is enough time for data and the acknowledgment to traverse about 8 hops.

CRE 0 - 0xFF 0x1E

Broadcast Hops. Set/Read the maximum number of hops for each broadcast data

transmission. Setting this to 0 will use the maximum number of hops.

CRE 0 - 0x1E 0

Operating 16-bit PAN ID. Read the 16-bit PAN ID. The OI value reflects the actual 16-

bit PAN ID the module is running on.

CRE 0 - 0xFFFF [read-only]

Node Discovery Timeout. Set/Read the node discovery timeout. When the network

discovery (ND) command is issued, the NT value is included in the transmission to

provide all remote devices with a response timeout. Remote devices wait a random

time, less than NT, before sending their response.

CRE 0x20 - 0xFF [x 100 msec] 0x3C (60d)

Network Discovery options. Set/Read the options value for the network discovery

command. The options bitfield value can change the behavior of the ND (network

discovery) command and/or change what optional values are returned in any received

ND responses or API node identification frames. Options include:

0x01 = Append DD value (to ND responses or API node identification frames)

002 = Local device sends ND response frame when ND is issued.

CRE 0 - 0x03 [bitfield] 0

Scan Channels. Set/Read the list of channels to scan.

Coordinator - Bit field list of channels to choose from prior to starting network.

Router/End Device - Bit field list of channels that will be scanned to find a Coordinator/

Router to join.

Changes to SC should be written using WR command to preserve the SC setting if a

power cycle occurs.

Bit (Channel): 0 (0x0B) 4 (0x0F) 8 (0x13) 12 (0x17)

1 (0x0C) 5 (0x10) 9 (0x14) 13 (0x18)

2 (0x0D) 6 (0x11) 10 (0x15) 14 (0x19)

3 (0x0E) 7 (0x12) 11 (0x16) 15 (0x1A)

CRE

XBee

1 - 0xFFFF [bitfield]

XBee-PRO (S2)

1 - 0x3FFF [bitfield]

(bits 14, 15 not allowed)

XBee-PRO (S2B)

1-0x7FFF

(bit 15 is not allowed)

1FFE

Scan Duration. Set/Read the scan duration exponent. Changes to SD should be

written using WR command.

Coordinator - Duration of the Active and Energy Scans (on each channel) that are

used to determine an acceptable channel and Pan ID for the Coordinator to startup on.

Router / End Device - Duration of Active Scan (on each channel) used to locate an

available Coordinator / Router to join during Association.

Scan Time is measured as:(# Channels to Scan) * (2 ^ SD) * 15.36ms - The number of

channels to scan is determined by the SC parameter. The XBee can scan up to 16

channels (SC = 0xFFFF).

Sample Scan Duration times (13 channel scan):

If SD = 0, time = 0.200 sec 

SD = 2, time = 0.799 sec 

SD = 4, time = 3.190 sec 

SD = 6, time = 12.780 sec

Note: SD influences the time the MAC listens for beacons or runs an energy scan on a

given channel. The SD time is not a good estimate of the router/end device joining time

requirements. ZigBee joining adds additional overhead including beacon processing on

each channel, sending a join request, etc. that extend the actual joining time.

CRE 0 - 7 [exponent] 3

ZigBee Stack Profile. Set / read the ZigBee stack profile value. This must be set the

same on all devices that should join the same network.

CRE 0 - 2 0

1 2 3 4 5 6 7 8 9 10

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