XE24S100 Просмотр технического описания (PDF) - Unspecified

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XE24S100

XE24S100 the Smallest, Complete 2.4 GHZ FHSS Transceiver

Unspecified 

XE24S COMMUNICATIONS CONTROLLER (continued)

Sample File Transfer

Transmitter

Receiver

TXD

RXD

TXD RXD

Description

AT#T01<cr>

Initiate File Transfer

:<cr>

FILE<cr>

Link Established

abc...z

abc...z

File Data

3 sec pause in data

A718<cr>

Checksum at End of File Transfer

OK<cr>

File Transfer Successful

or

ERROR<cr>

Error Detected in File Transfer

Note: In the above example that the file transfer is assumed to be completed when three seconds pass with

no data being presented to the TXD input on the serial port.

Multipoint Network

System designers can create a point-to-multipoint network with up to 253 remote nodes. The master node

is assigned address 1. The remote nodes use addresses 2 to 254. For efficient network operation, Count-

Off™ allows the master node to poll the entire network in under 10 seconds.

Count-Off™ permits the master node in a point-to-multipoint system to quickly check the status of all

network nodes. It creates a temporary time division multiplexing scheme which permits each node to

report its status without the handshaking sequence normally required for a wireless data exchange.

Count-Off™ is initiated by the AT#C command, from the host system. The master node broadcasts the

command to all network nodes. Upon receipt of the command each remote node initializes an internal

timer. Then in sequence by address each node transmits an 8-byte status message. The status message

is programmed with the AT#E: or AT#E= command. The status byte is passed to the host system in the

correct sequence upon receipt of the Count-Off message from the master node.

Using Count-Off™ network reporting will be completed in less than 10 seconds. Based on the status

information the host can then elect to service any of the remote nodes.

COUNT-OFF™ SEQUENCE

Node n

Node 1

Node 2

Node n

Node 1

Node 2

Node n

Node 1

Node 9

Node 8

Master

Node 3

Node 4

Node 7

Node 5

Node 6

Node 9

Node 8

Master

Node 3

Node 9

Node 4

Node 8

Master

Node 7

Node 5

Node 6

Node 7

Node 6

T0 - Master Broadcasts

Count-Off Initiation

T1 - Node 1 Transmits

8-Byte Status

T2 - Node 2 Transmits

8-Byte Status

XECOM

(9)

Tn - Node n Transmits

8-Byte Status

Count-Off Complete

XE24S100

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