BACnetWhoIs (FUN)

FUNCTION BACnetWhoIs : IEC_BACNET_STATUS

Sends a who-Is request.

Sends a BACnet Who-Is request to a local or remote device or network. This routine allows an application to discover BACnet Devices for which the Address isn’t known previously. In a simple network with only one LAN using ARCNET or Ethernet, a minimum delay of 1 second is adequate, but higher values may be appropriate in some situations.

InOut:

Scope	Name	Type	Comment
Return	BACnetWhoIs	IEC_BACNET_STATUS	A status indicating whether the operation worked.
Input	pSourceAddress	POINTER TO IEC_BACNET_ADDRESS	If the BACnet application has only one device constructed and installed, this can be 0. In this case the MAC address of this device will be used. Otherwise this shall be the MAC address returned on device object construction.
	pDestinationAddress	POINTER TO IEC_BACNET_ADDRESS	This is the MAC address of the device to which the request should be sent.
	filterMin	IEC_BACNET_DWORD	Optional argument for the Who-Is request, which limit the lower range of Device instance numbers expected to respond to the Who-Is request. This argument is omitted from the request if both parameters have the value “BACNET_NO_FILTER” (use -1).
	filterMax	IEC_BACNET_DWORD	Optional argument for the Who-Is request, which limit the upper range of Device instance numbers expected to respond to the Who-Is request. This argument is omitted from the request if both parameters have the value “BACNET_NO_FILTER” (use -1).