GC Communications status list (continued)Table 5-14:
GCComm status value Error description
15 GC does not support the requested message data type.
16 GC does not support the requested data protocol.
17 The meter's Modbus request message (RTU protocol) is too
long (exceeds the maximum allowable length).
18 GC response not received within the communication timeout.
19 GC response message (ASCII protocol) incomplete.
20 GC response message (RTU protocol) incomplete.
GC data validity
The GC-read gas property data validity is indicated by the AreGasPropertiesInvalidGC data
point. The data is considered invalid if any of the conditions listed in Table 5-15 is true.
These conditions are indicated by the Daniel MeterLink Monitor page Field I/O indicator.
GC-read gas property invalid conditionsTable 5-15:
Indication Data Point Condition
IsGCAlarmPresent Invalid GC feature key (Section 3.1.2)
Port improperly configured (such as if configured without using the Dan-
iel MeterLink Field Setup Wizard).
Unrecognized gas component ID.
Specified gas stream (GCStreamNumber) not found within the specified
period (GCDesiredStreamTimeout).
GC reported alarm (GC Alarm1 bits 14 and/or 15 set, GC Alarm2 bits 0, 1,
2, and/or 3 set).
IsGCWarningPresent Not presently used - reserved for future use.
IsGCCommErr Refer to communication error conditions listed in Table 5-14
IsGCDataErr The total unnormalized gas composition mole percentage is not within
[85%, 115%].
An individual gas composition mole percentage is not within [0%, 100%].
The specific gravity is not within [0.2, 0.8].
The heating value is greater than 50 kJ/dm
3
.
GC alarm handling
The following data points are included in the meter's alarm log (See Section 6.1.2):
AreGasPropertiesInvalidGC, IsGCAlarmPresent, IsGCCommErr, GCCommStatus, and
IsGCDataErr.
Configurations
74 3410 Series Gas Ultrasonic Flow meters
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