9. Long Term Datalogger
Issue 06/15 Publication PUB059-002-00 127 of 136
For example: to see all Modbus messages for all the FCUs on the A side of a hot standby master with
Modbus address 240 between 19
th
May and 23rd May, the following filter would be set up:
Example data:
The data is displayed in a number of columns with the following headings:
Sr.No: this is the serial number of the information within the display.
Date – Time: Date and Time of the event / message.
MessageContent: shows the complete message content i.e. complete Modbus message.
MessageMode: shows the type of message and decodes it where possible.
Source: indicates where the message came from and, for Modbus, which database is being
used.
FCU: The address of the FCU which the message is aimed for.
Channel: indicates which side of the master station the message appear on.
There is a lot of internal status data passed on the back plane which is decoded by the LTDViewer.
For example, in the command drop-down box, selection of Parameter Block Transfer and selecting
‘Filter !’ will enable these internal status messages to be seen. A lot of useful information is in there
including status of the standby master station.
In this example we can see the position of one of the FCUs being reported.
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