owAlarmSearch (Function)

This function will search for the first 1-Wire device responding to a conditional search.

See owSearchX to perform a normal search.

To make a device respond to owAlarmSearch, please consult the data sheet for the specific device.

After the device has been discovered, it can be accessed with owAlarmAccess.

Input:

first        : INT [0..255] (default 0)

Skip devices with lower family codes.

last        : INT [0..255] (default 255)

Do not search for devices with higher family codes than this.

Returns: INT

Declaration:

FUNCTION owAlarmSearch : INT;
VAR_INPUT
  first : INT := 16#00;
  last : INT := 16#FF;
END_VAR;

Example:

INCLUDE rtcu.inc
 
PROGRAM test;
 
BEGIN
  ...
  // Search for a DS2408 or a temperature sensor that is alerting.
  IF owAlarmSearch(first := 16#28, last := 16#29) < 1 THEN
    DebugMsg(message:="No alarm!");
  ELSE
     // Get ID of device
    DebugMsg(message:="Alarm on device: " + owAlarmGetID());
     // Get Family of device
    DebugMsg(message:="Device family: " + owAlarmGetFamily());
     ...
  END_IF;
END;
 
END_PROGRAM;