Echelon OpenLDV - Manual (Page 67)

OpenLDV Programmer’s Guide 59
Extended Header
Extended Data Type
Extended Data Version
Extended Data
BF
Packet Size
Flags
Extended Header Size
Absolute Timestamp
In Seconds
Absolute Timestamp
In Milliseconds
Differential Timestamp
In Microseconds
SICB
Timestamps
Header
SICB
Extension
Command
Length N
Data[0]
Data[1]
Data[N-1]
Data
Payload
NI Header
Queue Command
Buffer Structure for
Commands That Do Not Use
a Message Queue
Buffer Structure for
Commands That Use
a Message Queue
Length N
Data[0]
Data[1]
Data[N-1]
Data
Payload
NI Header
LdvEx Buffer
Format
SICB Buffer
Formats
Figure 5. Application Buffer High-Level Structure
For commands that use a message queue, the queue bits in the SICB buffer
indicate the path by which an incoming message was received, or by which an
outgoing message should leave the network interface. For example, an outgoing
message can use the standard, non-priority, output queue or the priority output
queue. Likewise, an incoming message might be received as a response to a
pending request, or it might be a normal incoming message. See Network
Interface Commands on page 77 for a description of the queue and command-code
values.
The OpenLDV Developer Example contains relevant data type definitions,
constants, and enumerations for messaging using the SICB buffer. The complete