 |
Datalogging
Client Transfers |
|
 |
| Retrieve
Data WITHOUT Polling! |
|
| Using
SIXNET Remote Terminal Units (RTUs)
and the Datalog Server you
have the option of retrieving your remote data without the
use of traditional polling methods. This can be a tremendous
advantage in applications where the considerations of polling
time, communications bandwidth and cost are significant factors
(for instance in large systems that utilize telephone and/or
radio links). |
|
| Advantages
to "Client" Reporting Over Traditional Polling
Methods: |
|
| Lower
Operating Costs |
|
Reduced
Network Load |
 Cost
per data transaction is reduced.
Eliminate
need for dedicated polling communications
infrastructure |
Scheduled
reporting and "report on exception"
reduces network traffic and latency
associated with traditional polling systems. |
|
|
| Quick
Response to Alarms |
Enhanced
Security |
| "Exception"
events reported on "near real-time"
basis as they occur. |
Client
initiated transfers are the practical solution
to passing data through firewalls. |
| |
|
|
SIXNET RTUs can be configured to act as a client/master
or server/slave (or both simultaneously) using SIXNET "I/O
for Windows" protocol. This secure communications method
uses packets to insure the integrity of data transmissions.
Both command and reply messages can travel simultaneously
over the same channel.
When the SIXNET RTU is in "client" (master) mode the Datalog
Server (slave) accepts the client initiated data transfer
and acknowledges its receipt. The received data is stored
in ASCII database files that may be viewed with Excel or any
other suitable database/spreadsheet program. Data from
each RTU is stored in its own file and a feature is provided
in the server configuration to automatically organize the
files by day, week or month. |
|
|
Client Initiated Data Transfers:
| A
SIXNET RTU programmed to act as a "client" (master) can initiate
transfer of information: |
 |
At selected times/intervals or in
convenient batches
For instance, you may program your RTU to initiate the transfer
of information regularly at off-hours when network traffic/bandwidth
use is low. |
|
|
Automatically under special "Report
on Exception" circumstances
SIXNET RTUs can be programmed to report alarms on an unsolicited
basis. When an alarm or "exception" event
occurs, the RTU can send all or part of the currently logged
data. |
|
|
Redundant Datalogging
When reporting in, SIXNET RTU's can transfer information to
multiple servers at remote locations. This redundant
datalogging capability provides additional protections
against loss of critical archive data. |
When the SIXNET RTU is in "client" (master) mode the Datalog
Server (slave) accepts the client initiated data transfer and
acknowledges its receipt. The received data is stored in ASCII
database files that may be viewed with Excel or any other suitable
database/spreadsheet program. Data from each RTU is stored
in its own file and a feature is provided in the server configuration
to automatically organize the files by day, week or month.
Each message sent from the RTU will include the station identification,
time stamp, and record serial number to facilitate the synchronizing
of database information. If more data than will fit in a single
message needs to be sent, the client station will send sequential
messages (after receipt of acknowledgment of the previous message).
Similarly, many stations can report data simultaneously since the
messages from multiple stations will stack in the incoming message
buffer and be processed sequentially. Since each message fully
stands alone and completely defines the references needed in each
packet, large systems of asynchronous data reports can be easily
accommodated.
The Datalog Server will accept
data from multiple serial ports and/or the Ethernet port simultaneously
and is suitable for large systems with many RTUs.
The Datalog Server is supplied
as part of the optional Datalogging feature set of the SIXNET
I/O Tool Kit. Merely install the latest version of the
I/O Tool Kit from the SIXNET CD
and the server will be installed automatically. Existing Tool
Kit licenses that include the datalogging option will run this new
server with no additional considerations. |
|
Certified
to Perform
 |
