Each SNMP proxy point type contains a corresponding proxy point extension. SNMP proxy point extensions have the same core properties as other proxy point extensions (described in the NiagaraAX-3.x Drivers Guide), plus some SNMP-specific properties, which are described here. These extension properties are similar for both client and agent proxy point application. There are some differences that are noted in the following list of property descriptions:
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Object Identifier (Client)
Specifies the OID of the actual SNMP device where the data is to be read from or written to.
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Object Identifier (Agent)
Displays the full OID to use for accessing the data value for this point from the Input Table (or Output Table) by an outside SNMP manager. SNMP GET or SET requests would use this full OID to access the value of the proxy point.
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Variable Type
This property specifies the variable type of the value that is written out to the SNMP device at the location of the OID specified in the 'Object Identifier' property.
This property is usually automatically set when the SNMP proxy point is created from the SnmpPointManager (as long as the
type field for the MIB entry created matches one of the known types). Otherwise the user will have to manually set this property
for the appropriate variable type before input values are properly written to this point in the actual SNMP device.
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Index (Agent)
The column index in the Input Table (or Output Table) used to locate the value of the proxy point. It is simply the last number in the 'Object Identifier' (OID) value. For example, if the index has a value of 1, then the OID containing the value of the point is 1.3.6.1.4.1.4131.1.4.1.3.1. If the index is 2, this corresponds to an OID of 1.3.6.1.4.1.4131.1.4.1.3.2, and so on.
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Default Value (Agent)
This property is the default value used for the output of the proxy point on startup prior to being set (by an external SNMP SET request). If 'autoSet' is checked, then the default value is automatically set (changed) whenever a new external SNMP SET request is received. If 'autoSet' is unchecked, then the Niagara user can specify a permanent default value (any external SNMP SET request will not change the default value). The Niagara user can manually reset the proxy point's output to the default value at any time by selecting the 'Reset Point To Default' action.