Standard Items

See Device Standard Items.

Protocol Items

The Mercury protocol implementation supports the item names listed below for use by client applications.
When using the 3 or 4 digit Item number, please refer to the OEM documentation for your Mercury device for the items applicable to your device.

Item	Data Type	Description
Item #	I2,I4,R4, UI2,BOOL, STRING	Item # is specified by 3 or 4 decimal digits. For Items that are applicable to your device, refer to the OEM documentation.
L Item #	R4	Takes a live reading of the instrument’s current measured value on the specified item. Valid items are L008, L026, L031, L420, L500, L501, L502, and L503.
BadSignOff	I2	Returns the number of failed Sign-offs. Write a zero to reset.
BadSignOn	I2	Returns the number of failed Sign-ons. Write a zero to reset.
BadSiteIdCounter	I2	Returns the number of Site ID mis-match errors. Write a zero to reset.
GoodSignOff	I2	Returns the number of successful Sign-offs. Write a zero to reset.
GoodSignOn	I2	Returns the number of successful Sign-ons. Write a zero to reset.
LastError	I2	Returns the most recently occurred error code.
ModemAlarm	I2	Modem Alarm value.
ModemAlarmClear	I2	Queue task to clear modem alarm.
ModemLowBattery	I2	Modem low battery alarm value.

Register items are validated by the field device during the item's first poll. If the field device reports that the item number is not applicable, by returning an error, the Mercury protocol module will internally flag the item as invalid and will not add it to future poll messages. This item flag can be reset by disabling the ACM device object, then re-enabling it.

Extended Items

The Mercury protocol implementation supports the item names listed below for use by client applications.

Item	Data Type	Description
LastAlarmRecord	Date	Timestamp of the last alarm record retrieved.
LastEventRecord	Date	Timestamp of the last event record retrieved.
LastHourlyRecord/<audit>	Date	Timestamp of the last hourly record retrieved from audit specified. Audit is one based. Ex: "LastHouryRecord/1".
LastTimeSync	Date	Timestamp of the last time synchronization attempt.
LastTimeSyncResult	I4	Result of the last time synchronization attempt.
RequestAuditItems	I2	Read the Audit Configuration items during the next history upload. Write a value of 1 to initiate.
RequestDeviceConfig	I2	Read the Device Configuration items during the next history upload. Write a value of 1 to initiate.
RequestMeterConfig	I2	Read the Meter EFM Configuration items during the next history upload. Write a value of 1 to initiate.
ResetAlarm	I2	Erase the alarm history retrieval pointer (and re-collect all alarm history during the next retrieval). Write a value of 1 to initiate.
ResetAudit/<audit>	I2	Erase the audit history retrieval pointer for audit specified (and re-collect all audit history during the next retrieval). Audit is one based. Ex: "ResetAudit/1". Write a value of 1 to initiate.
ResetEvent	I2	Erase the event history retrieval pointer (and re-collect all event history during the next retrieval). Write a value of 1 to initiate.
RetrieveHistory	I2	Retrieve enabled history. Write a value of 1 to initiate.
RetrieveHistoryCancel	I2	Cancel the retrieval of enabled history. Write a value of 1 to initiate.
TimeSync	I2	Perform time synchronization. Write a value of 1 to initiate.

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