# BASEstartm Classic DAS
for OMNItm Software
Installation and User's Guide

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## 3.3.2 Pollsets/Scattered Read

BASEstar Classic physical points may be grouped together into pollsets to optimize data collection and to provide the ability to read a group of points on a specified time interval.

DCM allows you to read groups of physical points (variables) using the scattered pollset feature. Any combination of physical points may be included in a pollset. The use of the /SCATTERED qualifier is mandatory when creating the pollset.

Figure 3-2 shows an example of creating a scattered pollset for reading groups of named variables.

Figure 3-2 Scattered Pollset Definition

    DCM> create pollset POLL1/device=TEST_PLC/interval=15/scattered
    DCM> create phypoint P1/dev=TEST_PLC/format=long/addr=VMD_INT32  -
    _DCM> /poll=POLL1/COLLECT
    DCM> create phypoint P2/dev=TEST_PLC/format=word/addr=OSAPWORD  -
    _DCM> /poll=POLL1/COLLECT
    DCM> SHOW POLL */DEV=TEST_PLC/FUL
    Device Name : TEST_PLC
    Pollset Name: POLL1
        Interval        :   15
        Enabled         :   No
        Format          :   SCATTERED
        Start Address   :   VMD_INT32
        Number elements :   2
        IO blocks       :   1
        Size (in bytes) :   6
        Buffers not dist:   0
        Defined on  ....
        Definition last updated on ....

    Permanent Lka Ctr           :0      Temporary Lka Ctr           :0
    Permanent Late Ctr          :0      Temporary Late Ctr          :0
    Permanent Device Errors     :0      Temporary Device errors     :0
    Permanent No Buffers errors :0      Temporary No Buffers errors :0
     BASEstar Classic point name:       DCM Phypoint name:
                                               P1
                                               P2
    DCM>

This service provides the equivalent of calling the omni_group_variable service for each physical point (variable) in the pollset.

For more information on physical points, see the BASEstar Classic Command Line Interface User's Guide.

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