Sequence element

Specifies a mathematical operation to be performed on the parameter value.

Contains at least one of the following mathematical operations, which must be specified using one of the following predefined formats:

• Fixed value: [operation]:[value]
• Value stored in a single parameter: [operation]:id:[pid]
• Value stored in a column parameter of the same row: [operation]:param:[pid]

If you specify multiple operations, separate them using semicolons (;).

List of possible operations:

Operation	Description
factor ()	Multiply the parameter with a particular value.
	offset (+)	Add a particular value to the parameter.
	min (-)	Subtract a particular value from the parameter.
	pow (^)	Raise the parameter to a particular power.
	div	Divide the parameter by a particular value.
	rest (%)	Perform a modulo operation (remainder) on the parameter using a particular value.
	log10	Perform a 10log10 operation on the parameter.
log20	Perform a 20*log10 operation on the parameter.

Type

string

Parent

Interprete

Attributes

Name	Type	Required	Description
loop	unsignedInt		Specifies the loop value for the sequence (integer).
noset	EnumTrueFalse	Yes	Always use this attribute with value set to true.

Remarks

• Only use a Sequence on communication parameters (i.e., parameters that are directly filled in by polling via SNMP, serial, etc.). Do not use it for custom/retrieved parameters (parameters filled in via a QAction.)

• Sequence should always be used with the noset="true" attribute.

• Only a change of the parameter with the Sequence tag can trigger the sequence. If Sequence uses id in its content, changing the content of the parameter with that ID will not force the sequence to run when the parameter with the Sequence tag is updated with the same value as before.

• For single standalone parameters, Sequence is only supported in combination with the snmpSetAndGet attribute. For table columns, Sequence is only supported in combination with the snmpSet option.

  <Param id="10">
     ...
     <Interprete>
     ...  
        <Sequence noset="true">div:id:101</Sequence>
     ...
     </Interprete>
     ...
  </Param>
  

  In the example above, if the parameter with ID 101 changes, but the parameter with ID 10 keeps getting set with the same value, the new sequence will never be triggered.

• On write parameters, use the reverse math operation in the reverse order compared to the corresponding read parameter.

  Example

  • Read parameter: <Sequence noset="true">div:100;+:5</Sequence>.
  • Write parameter: <Sequence noset="true">min:5;factor:100</Sequence> or <Sequence noset="true">-:5;*:100</Sequence>.

Examples

<Sequence noset="true">div:param:101</Sequence>