I know the FIND protocol is used to discover which LRUs are available if the data loader supports the FIND protocol. I also know the message is sent as a broadcast using UDP, but what is in the message that's being broadcasted?

  • $\begingroup$ ARINC 615A dataload protocol does not use ARINC 429 (ARINC 615 does). ARINC 615A uses Ethernet. $\endgroup$
    – Gerry
    Aug 22, 2018 at 2:57
  • $\begingroup$ I did not tag this 429. I am looking for 615 over Ethernet $\endgroup$
    – DCorrigan
    Aug 22, 2018 at 8:56

1 Answer 1


Attachment 3 of ARINC 615A-3 describes the FIND function. The FIND protocol has an Information Request (IRQ) packet and an Information Answer (IAN) packet. Each packet contains a 2 byte header and a variable length data portion.

3-4 Information Request Packet

Source MAC address should be the MAC address of the data loader (or the initiator.

Destination MAC address should be a unicast, multicast, or the broadcast MAC address.

Source IP Address should be the IP address of the Data loader (or the initiator).

Destination IP address should be a unicast, multicast, or a broadcast IP address (full broadcast i.e., or class-relevant broadcast e.g., for a class C).

Opcode value should be IRQ (0x0001).

Data list should be a null ASCII string with terminator: 0x00.

Packet is terminated by 0x10.


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