XBIB-U【PDF 47/72 页】BOARD USB ZIGBEE MOD PRO

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XBee/XBeePRO"燨EM燫F燤odules??02.15.4?爒1.xAx燵2007.05.031]

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Chapter??燫F燤odule燙onfiguration

ND (Node Discover) Command

<Networking {Identification}> The ND command

is used to discover and report all modules on its

current operating channel (CH parameter) and

PAN ID (ID parameter). ND also accepts an NI

(Node Identifier) value as a parameter. In this

case, only a module matching the supplied identi-

fier will respond.

ND uses a 64-bit long address when sending and

responding to an ND request. The ND command

causes a module to transmit a globally addressed ND command packet. The amount of time

allowed for responses is determined by the NT (Node Discover Time) parameter.

In AT Command mode, command completion is designated by a carriage return (0x0D). Since two

carriage returns end a command response, the application will receive three carriage returns at

the end of the command. If no responses are received, the application should only receive one

carriage return. When in API mode, the application should receive a frame (with no data) and sta-

tus (set to OK) at the end of the command. When the ND command packet is received, the

remote sets up a random time delay (up to 2.2 sec) before replying as follows:

Node Discover Response (AT command mode format - Transparent operation):

MY (Source Address) value

SH (Serial Number High) value

SL (Serial Number Low) value

DB (Received Signal Strength) value

NI (Node Identifier) value

<CR> (This is part of the response and not the end of command indicator.)

Node Discover Response (API format - data is binary (except for NI)):

2 bytes for MY (Source Address) value

4 bytes for SH (Serial Number High) value

4 bytes for SL (Serial Number Low) value

1 byte for DB (Received Signal Strength) value

NULL-terminated string for NI (Node Identifier) value (max 20 bytes w/out NULL terminator)

NI (Node Identifier) Command

<Networking {Identification}> The NI command

is used to set and read a string for identifying a

particular node.

Rules:

" Register only accepts printable ASCII data.

" A string can not start with a space.

" A carriage return ends command

" Command will automatically end when maximum bytes for the string have been entered.

This string is returned as part of the ND (Node Discover) command. This identifier is also used

with the DN (Destination Node) command.

NT (Node Discover Time) Command

<Networking {Identification}> The NT command

is used to set the amount of time a base node will

wait for responses from other nodes when using

the ND (Node Discover) command. The NT value

is transmitted with the ND command.

Remote nodes will set up a random hold-off time

based on this time. The remotes will adjust this

time down by 250 ms to give each node the abil-

ity to respond before the base ends the command. Once the ND command has ended, any

response received on the base would be discarded.

AT Command: ATND

Range: optional 20-character NI value

Related Commands: CH (Channel), ID (Pan ID),

MY (Source Address), SH (Serial Number High),

SL (Serial Number Low), NI (Node Identifier),

NT (Node Discover Time)

Minimum Firmware Version Required: v1.x80

AT Command: ATNI

Parameter Range: 20-character ASCII string

Related Commands: ND (Node Discover), DN

(Destination Node)

Minimum Firmware Version Required: v1.x80

AT Command: ATNT

Parameter Range: 0x01 - 0xFC

[x 100 msec]

Default: 0x19 (2.5 decimal seconds)

Related Commands: ND (Node Discover)

Minimum Firmware Version Required: 1.xA0

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