DeviceNet Master Protocol API
DeviceNet Master Protocol API
DeviceNet Master Protocol API
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<strong>DeviceNet</strong>-<strong>Master</strong> Dual-Port Memory • 33<br />
3.2.2 Status & Error Codes<br />
The following status and error codes can be returned in ulSta: List of codes see manual named<br />
netX Dual-Port Memory Interface.<br />
3.2.3 Differences between System and Channel Mailboxes<br />
The mailbox system on netX provides a non-cyclic data transfer channel for field bus and industrial<br />
Ethernet protocols. Another use of the mailbox is allowing access to the firmware running on the netX<br />
chip itself for diagnostic purposes. There is always a send and a receive mailbox. Send and receive<br />
mailboxes utilize handshake bits to synchronize these data or diagnostic packages through the<br />
mailbox. There is a pair of handshake bits for both the send and receive mailbox.<br />
The netX operating system rcX only uses the system mailbox.<br />
• The system mailbox, however, has a mechanism to route packets to a communication<br />
channel.<br />
• A channel mailbox passes packets to its own protocol stack only.<br />
3.2.4 Send Mailbox<br />
The send mailbox area is used by protocols utilizing a non-cyclic data exchange mechanism. Another<br />
use of the mailbox system is to provide access to the firmware running on the netX chip itself. The<br />
send mailbox is used to transfer non-cyclic data to the network or to the protocol stack.<br />
The size is 1596 bytes for the send mailbox in the default memory layout. The mailbox is accompanied<br />
by counters that hold the number of packages that can be accepted.<br />
3.2.5 Receive Mailbox<br />
The receive mailbox area is used by protocols utilizing a non-cyclic data exchange mechanism.<br />
Another use of the mailbox system is to provide access to the firmware running on the netX chip itself.<br />
The receive mailbox is used to transfer non-cyclic data from the network or from the protocol stack.<br />
The size is 1596 bytes for the receive mailbox in the default memory layout. The mailbox is<br />
accompanied by counters that hold the number of waiting packages (for the receive mailbox).<br />
Hilscher Gesellschaft für Systemautomation mbH – Rheinstr. 15 – D-65795 Hattersheim<br />
Edition 3 – <strong>API</strong>:<strong>DeviceNet</strong>-<strong>Master</strong>#EN– 2009/01
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