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Logic - is a mechanism for automatic management.

The syntax of a logic description

The logic is described by a line in the following form:

(SENSORID OLDSTATE-NEWSTATE OPERATOR ...){SENSORID1:TIMEOUT NEWSTATE2 OPERATOR2 ...}

Where:

  • SENSORID - unique sensor ID.
  • OLDSTATE-NEWSTATE - sensor status codes, with which the condition is true in transition. The values of both parameters should be the same.
  • OPERATOR - the operator code with which the result of conditions is calculated.
  • SENSORID1 - Unique sensor ID whose status should be changed under the conditions of the logical scheme.
  • TIMEOUT - A timeout condition.
  • NEWSTATE2 - The status code where you want to move the element (relay).
  • OPERATOR2 - Symbol '+'.

Status codes are:

  • 'normal': 1;
  • 'low': 2;
  • 'warning': 3;
  • 'alarm': 4;
  • 'on': 5;
  • 'off': 6.
  • 'not connected': 7.
  • 'pulse': 8.

Operators codes:

  • 'and': symbol '+';
  • 'or': symbol '|'.

Manage logic

To create a logic use field ctlLogicRowStatus. Moving field ctlLogicRowStatus in a state CreateAndWait(5) will create a new note in the table сtlLogicsTable.

After creating the logic it is necessary to specify its name in a field ctlLogicName and logic description in a field ctlLogicDescription.

After creating a logic description, the logic becomes active, as indicated by the value active(1) in a field ctlLogicRowStatus.

Turn off the logic is performed by setting a field ctlLogicDisable desired interval in seconds.

Turn on logic is performed by setting the field ctlLogicDisable value of '0'.

Remove logic is performed by setting the field ctlLogicRowStatus in a state destroy(6).


Example. Creating, editing, checking, and removing logic

Reading the logic table:

$ snmptable -Ci -Cb -v2c -cread 192.168.0.193 VUTLAN-SYSTEM-MIB::ctlLogicsTable
SNMP table: VUTLAN-SYSTEM-MIB::ctlLogicsTable

index ID           Name          Description Disable RowStatus
    1  1 "Logic scheme" "(20 4 - 4){34:0 8}"       0    active


Creating new logic:

$ snmpset -v2c -cwrite 192.168.0.193 VUTLAN-SYSTEM-MIB::ctlLogicName.2 s "New Logic" \
 VUTLAN-SYSTEM-MIB::ctlLogicDescription.2 s "(20 1-1){301:0 5}" \
 VUTLAN-SYSTEM-MIB::ctlTrapRowStatus.2 i createAndGo
VUTLAN-SYSTEM-MIB::ctlLogicName.2 = STRING: "New Logic"
VUTLAN-SYSTEM-MIB::ctlLogicDescription.2 = STRING: "(20 1-1){301:0 5}"
VUTLAN-SYSTEM-MIB::ctlTrapRowStatus.2 = INTEGER: createAndGo(4)


View created logic table:

$ snmptable -Ci -Cb -v2c -cread 192.168.0.193 VUTLAN-SYSTEM-MIB::ctlLogicsTable
SNMP table: VUTLAN-SYSTEM-MIB::ctlLogicsTable

index ID           Name          Description Disable RowStatus
    1  1 "Logic scheme"   "(20 4-4){34:0 8}"       0    active
    2  2    "New Logic"  "(20 1-1){301:0 5}"       0    active


Now we have two logics:

  • Logic "Logic scheme" is triggered when an element of the system with ID = 20 goes to state "alarm"(4) and provides an incentive "pulse"(8) on the element with ID=34 (relay or outlet, see table above) immediately (through 0 с);
  • Logic "New Logic" is triggered, when an element of the system with ID=20 goes to state "normal"(1) and provides an incentive "on"(8) on the element with ID=301 (Trap element, see table above) immediately (through 0 с);

Disabling the logic in 60 seconds:

$ snmpset -v2c -cwrite 192.168.0.193 VUTLAN-SYSTEM-MIB::ctlLogicDisable.2 i 60
VUTLAN-SYSTEM-MIB::ctlLogicDisable.2 = INTEGER: 60


Verify that the logic is disabled:

$ snmpget -v2c -cwrite 192.168.0.193 VUTLAN-SYSTEM-MIB::ctlLogicDisable.2
VUTLAN-SYSTEM-MIB::ctlLogicDisable.2 = INTEGER: 1


Remove Logic:

$ snmpset -v2c -cwrite 192.168.0.193 VUTLAN-SYSTEM-MIB::ctlLogicRowStatus.2 i destroy
VUTLAN-SYSTEM-MIB::ctlLogicRowStatus.2 = INTEGER: destroy(6)

After the removal of the logic, the logic table should have an initial appearance.

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