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LNS Programmer's Guide

200

Setting Monitoring Options

Each MonitorSet object, and each individual MsgMonitorPoint and NvMonitorPoint

object, contains properties that allow you to determine the behavior of the monitor set or

monitor point while it is monitored and controlled. These properties are listed and

described in the following sections.

• MonitorSet.NvOptions and MonitorSet.MsgOptions – Each

MonitorSet object contains an NvOptions property, and a MsgOptions

property. The NvOptions property provides access to an

NvMonitorOptions object that stores the default monitoring options

that are applied to all network variable monitor points as they are added

to the monitor set. The MsgOptions property provides access to a

MsgMonitorOptions object that stores the default monitoring options

that are applied to all message monitor points as they are added to the

monitor set.

Changes to the NvOptions and MsgOptions properties are not managed

retroactively, meaning that monitor points that have already been added

to a monitor set are not affected when these properties are changed.

However, for network variable monitor points, there are a few exceptions

to this rule. See NvMonitorOptions Object on page 202 for more

information on this.

• NvMonitorPoint.DefaultOptions and

MsgMonitorPoint.DefaultOptions – Each NvMonitorPoint and

MsgMonitorPoint object in a monitor set contains a DefaultOptions

property. The DefaultOptions property provides access to a

MsgMonitorOptions object (or NvMonitorOptions object) that stores

the default monitoring options that are applied to that particular monitor

point. These are the options that will be used for that monitor point when

the monitor set is opened, and a monitoring session begins.

When a monitor point is added to a monitor set, the DefaultOptions for the

point are set to match to the settings stored in the NvOptions or

MsgOptions objects for the monitor set. You can modify the monitor point’s

DefaultOptions property if you want that monitor point to have different

default options than the rest of the set. However, if you change these

properties while the monitor set is open, the changes will not be reflected

until the monitor set is closed and re-opened.

NOTE: Because temporary monitor points are only used in a single client

session, their DefaultOptions are not accessible. If you attempt to acquire

the DefaultOptions property through a temporary monitor point, the

LCA:#161 lcaErrNotAllowedOnTemporaryObject exception will be

thrown. All temporary monitor points are created with the default options

defined for the monitor set via the NvOptions and MsgOptions properties.

• NvMonitorPoint.CurrentOptions and

MsgMonitorPoint.CurrentOptions – Each NvMonitorPoint and

MsgMonitorPoint object in a monitor set contains a CurrentOptions

property. The CurrentOptions property provides access to a

NvMonitorOptions object (or MsgMonitorOptions object). The

CurrentOptions are set to match the values of the monitor point’s

DefaultOptions object every time the monitor point is enabled.

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