XE0092LCC ETC1 [List of Unclassifed Manufacturers], XE0092LCC Datasheet - Page 9

• Manufacturer Part Number: XE0092LCC
• Description: Surface-Mount DAA Modules for Audio or Data Transfer
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

COUNT-OFF™ SEQUENCE
XE24S COMMUNICATIONS CONTROLLER (continued)
Sample 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.
Node 9
Node 8
3 sec pause in data
T
XECOM
0
Node n
- Master Broadcasts
AT#T01<cr>
Count-Off Initiation
Node 7
abc...z
TXD
Node 1
Master
Node 6
Transmitter
Node 2
Node 5
Node 3
Node 4
Node 4
RXD
:<cr>
Node 9
Node 8
T
1
Node n
- Node 1 Transmits
8-Byte Status
Node 7
Node 1
Master
Node 6
TXD
Receiver
Node 2
Node 5
ERROR<cr>
Node 3
Node 4
Node 4
A718<cr>
FILE<cr>
OK<cr>
abc...z
RXD
or
(9)
Node 9
Node 8
T
Node n
2
- Node 2 Transmits
Node 7
8-Byte Status
Node 1
Master
Node 6
Checksum at End of File Transfer
Error Detected in File Transfer
File Transfer Successful
Initiate File Transfer
Link Established
Description
File Data
T
n
- Node n Transmits
8-Byte Status
Count-Off Complete
XE24S500