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2.5 Redundant Twin Mode
2-14
GadgetGateway Overview
then the status SNVT will only propagate when changed or updated by the monitoring
application. Typically the status is updated when the twin mode state changes.
The fields used in the status SNVT are as follows:
comm_failure
is set to 1 when there is either a monitoring failure or a diagnostic
detects a fault. comm_failure is not set to 0 until all failures and faults have cleared.
reserved2
is set based on the system state. See the following table.
2.5.6 Alarm SNVT
The monitoring application also has an Alarm2 SNVT type 164. This alarm is propagated
whenever a fault is detected or cleared. The fields used in the Alarm2 SNVT are as fol-
lows:
alarm_type
is set to 1 whenever a diagnostic detects a fault.
alarm_type
is set to 0
when all faults have cleared.
description
is set to an ASCII text description of the associated fault state whether IP
or LON or both or cleared.
2.5.7 Status Report UNVT
The monitoring application has a status report UNVT that includes some extra informa-
tion that would not fit in the Status SNVT. The status report UNVT is scheduled for prop-
agation whenever one of its fields is updated. It will only be propagated if bound or polled.
The c structure for the UNVT is as follows:
typedef struct
{
unsigned char Status;
char reserved[3];
TABLE 1. Bit values for reserve2 status byte (big endian)
Bit Value
7 1 Active State, 0 Inactive State
6 1 Forwarding, 0 Dropping
5 1 Repair State, 0 Not Repair State
4 1 Diagnostic State, 0 Not Diagnostic State
3 1 IP side failure, 0 No IP side failure
2 1 LON side failure, 0 No LON side failure
1 1 IP side fault, 0 No IP side fault
0 1 LON side fault, 0 No LON side fault