DeviceNet Master Protocol API

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DeviceNet-Master Fundamentals • 18 2.2 Accessing the Protocol Stack by Programming the AP Task’s Queue In general, programming the AP task or the stack has to be performed according to the rules explained in the Hilscher Task Layer Reference Manual. There you can also find more information about the variables discussed in the following. 2.2.1 Getting the Receiver Task Handle of the Process Queue To get the handle of the process queue of the DeviceNetAP-Task or the DeviceNet FAL -Task the Macro TLR_QUE_IDENTIFY() needs to be used. It is described in detail within section 10.1.9.3 of the Hilscher Task Layer Reference Model Manual. This macro delivers a pointer to the handle of the intended queue to be accessed (which is returned within the third parameter, phQue), if you provide it with the name of the queue (and an instance of your own task). The correct ASCII-queue names for accessing the DeviceNetAP -Task or the DeviceNet FAL -Task, which you have to use as current value for the first parameter (pszIdn), is ASCII Queue name "QUE_DEVNET_AP” "DEVNET_FAL_QUE” Description Name of the DeviceNet Application-Task process queue Name of the DeviceNet Field Application Layer-Task process queue Table 7: Names of Queues in Device Net Firmware The returned handle has to be used as value ulDest in all initiator packets the AP-Task intends to send to the EipObject-Task . This handle is the same handle that has to be used in conjunction with the macros like TLR_QUE_SENDPACKET_FIFO/LIFO() for sending a packet to the respective task. 2.2.2 Meaning of Source- and Destination-related Parameters The meaning of the source- and destination-related parameters is explained in the following table: Variable ulDest ulSrc ulSrcId Meaning Application mailbox used for confirmation Queue handle returned by TLR_QUE_IDENTIFY() as described above. Used for addressing at a lower level Table 8: Meaning of Source- and Destination-related Parameters. For more information about programming the AP task’s stack queue, please refer to the Hilscher Task Layer Reference Model Manual. Especially the following sections might be of interest in this context: 1. Chapter 7 “Queue-Packets” 2. Section 10.1.9 “Queuing Mechanism” Hilscher Gesellschaft für Systemautomation mbH – Rheinstr. 15 – D-65795 Hattersheim Edition 3 – API:DeviceNet-Master#EN– 2009/01
DeviceNet-Master Fundamentals • 19 2.3 Accessing the Protocol Stack via the Dual Port Memory Interface This chapter defines the application interface of the EtherNet/IP-Adapter Stack. 2.3.1 Communication via Mailboxes The mailbox of each communication channel has two areas that are used for non-cyclic message transfer to and from the netX. • Send Mailbox Packet transfer from host system to netX firmware • Receive Mailbox Packet transfer from netX firmware to host system For more details about acyclic data transfer via mailboxes, see section 3.2. Acyclic Data (Mailboxes) in this context, is described in detail in section 3.2.1 “General Structure of Messages or Packets for Non- Cyclic Data Exchange” while the possible codes that may appear are listed in section 3.2.2. “Status & Error Codes”. However, this section concentrates on correct addressing the mailboxes. Hilscher Gesellschaft für Systemautomation mbH – Rheinstr. 15 – D-65795 Hattersheim Edition 3 – API:DeviceNet-Master#EN– 2009/01
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