Echelon ISI - Manual (Page 74)

ISI Programmer’s Guide 72
formatted as a network variable update. Include an explicit address for the
message with addressing details from an application-level address table and
identify the message as using the acknowledged service, and then explicitly send
the message.
E
XAMPLE
The following example shows the construction of a CSMOEX for an
acknowledged connection, and monitors DRUMs to update subnet and node
IDs in a device that allows connections to one other device. The
isiFlagExtended flag is required for transmitting this CSMOEX (but not for
receiving).
static const IsiCsmoData myCsmoData = {
ISI_DEFAULT_GROUP,
// Group
isiDirectionOutput, // NV direction
1, // Width
2, // Profile number (2 =
// SFPTopenLoopSensor)
76u, // Network variable type index
// (76 = SNVT_freq_hz)
0, // Variant (0 = standard)
1, // Acknowledged
0, // Poll
isiScopeStandard, // Scope that defines FPT or NVT
{0x9F, 0xFF, 0xFF, 0x05, 0x00, 0x05}, // application
1 // Network variable member
// number (1 = nvoValue)
};
typedef struct {
unsigned NeuronId[NEURON_ID_LEN];
unsigned subnet;
unsigned node;
} AddressTracker;
AddressTracker eeprom addressTracking = {
{0,0,0,0,0,0}, 0, 0
};
when (msg_arrives) {
IsiMessage
msg;
if (IsiApproveMsg()) {
// Prior to calling IsiProcessMsg(), pre-process DRUM
// messages by updating the AddressTracker
memcpy(&msg,
msg_in.data, sizeof(IsiMessage));
if (msg.Header.Code == isiDrum) {
if (memcmp(addressTracking.NeuronId,
msg.Msg.Drum.NeuronId, NEURON_ID_LEN) == 0) {
addressTracking.subnet = msg.Msg.Drum.SubnetId;
addressTracking.node = msg.Msg.Drum.NodeId;
}
}
// Call the ISI message handler
(void) IsiProcessMsgS();
}
}
The addressTracking variable maintains the current subnet/node ID pair for the
device with the Neuron ID that is also kept in the addressTracking variable. The