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FieldUnit - Modbus Master (and others)

See the Elecsys documentation on various FieldUnit protocols for information on configuring the FieldUnit, including protocol-specific Poll Table, such as:

   – Protocol_Modbus-Master

  – Modbus SOS (Specific Outstation) poll modifications

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PropertiesValues
Reserved

Unused field 

Timestamp

Click the Edit Table button to add as many rows as necessary to define the Timestamp operation. 

Poll Number – Enter the row number of the poll defined in the unit's Poll Table.

Whenever this poll occurs for the defined points (or when any changed data points are stored in the RTDB field), a timestamp is also stored. Poll numbers start at 1. 

Stamp Address – Register address within the RTDB for this Field Unit in which to store the timestamp value for this poll.

The Stamp Address should be the first of one or more registers with a UINT16 or UINT32 data type, and must be defined in the RTDB with the correct quantity and type. Make sure that each register or registers occupied by the timestamp are not overwritten by any other data value to avoid conflicting data.

Stamp Format – Data format to use when storing data into the specified register (UINT16 or UINT32). 

The Stamp Format should be chosen appropriately to match the Stamp Type (below), and the data type of the RTDB register. UINT24 or UINT32 data types should be stored into a UINT32 RTDB register.

    • UINT16
    • UINT32
    • UINT64 (seconds*1000 + mSec from 1969 if Packed, else 1979)

Stamp Type – Format in which to store the timestamp.

  • 32 bit centi-seconds (1 reg, Always) - Store timestamp at the time each poll is initiated, as a 32-bit number as centi-seconds (10's of milliseconds) since the last startup.
  • 32 bit seconds + mSec (2 reg, Always) - Store timestamp at the time each poll is initiated, as two 32-bit numbers (seconds since January 1, 19801970; and milliseconds).
  • YYYY,MM,DD,HH,mm,ss,mSec (7 reg, Always) - Store timestamp at the time each poll is initiated, as seven 16-bit registers containing year, month (1-12), day (1-31), hour, minute, second, milliseconds.
  • 32 bit centi-seconds (1 reg, Post-Deadband) - Store timestamp only on changed RTDB data, as a 32-bit number as centi-seconds (10's of milliseconds) since the last startup.
  • 32 bit seconds + mSec (2 reg, Post-Deadband) - Store timestamp only on changed RTDB data, as two 32-bit numbers (seconds since January 1, 19801970; and milliseconds).
  • YYYY,MM,DD,HH,mm,ss,mSec (7 reg, Post-Deadband) - Store timestamp only on changed RTDB data, as seven 16-bit registers containing year, month (1-12), day (1-31), hour, minute, second, milliseconds. 

Comment - Optional column, allowing a descriptive comment to be entered for each row in the table. The Comment field is unused in the configuration.

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