Mercury OPC Items

Standard Items

Protocol Items

The Mercury protocol implementation supports the item names listed below for use by client applications.
When using the 3 digit Item number, please refer to the OEM documentation for your Mercury device for the items applicable to your device.
The following named items are not available for all Mercury device types.

Item	Data Type	Description
Item #	I2,I4,R4, UI2,BOOL, STRING	Item # is specified by 3 decimal digits. For Items that are applicable to your device, refer to the OEM documentation.
AuthItem #	I2	Reads the authorization code associated with the item specified with the item # from the current connection. Poke new authorization code (‘0’ or ‘1’) to write.
LItem#	R4	Takes a reading of the instrument’s current measured value on the specified item from the current connection. *For this command, the item # can only be 008 (pressure) or 026 (temperature) for EC-AT, and 500, 501, and 502 for ER.*
BadSignOff	I2	Returns the number of failed Sign-offs.
BadSignOn	I2	Returns the number of failed Sign-ons.
BadSiteIdCounter
ChangeACS	BOOL	Change the instrument access code from the current connection. Poke new instrument access code (00000 – 99999). It will reset to ‘0’ if successful; reset to ‘2’ if failed.
GoodSignOff	I2	Returns the number of successful Sign-offs.
GoodSignOn	I2	Returns the number of successful Sign-ons.
LastError	I2	Returns the most recently occurred error code.
ModemAlarm	I2	Modem Alarm
ModemAlarmClear	I2	Clear modem alarm.
ModemLowBattery	I2	Modem low battery.

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 from meter number 1.
LastEventRecord	Date	Timestamp of the last event record retrieved from meter number 1.
LastHourlyRecord	Date	Timestamp of the last hourly record retrieved from meter number 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.
RequestDeviceConfig	I2	Read the Device Configuration.
RequestMeterConfig	I2	Read the Meter Configuration.
Reset Alarm	I2	Erase the alarm history retrieval pointer for meter 1 (and re-collect all alarm history during the next retrieval).
Reset Audit	I2	Erase the audit history retrieval pointer for meter 1 (and re-collect all audit history during the next retrieval).
Reset Event	I2	Erase the event history retrieval pointer for meter 1 (and re-collect all event history during the next retrieval).
RetrieveHistory	I2	Retrieve enabled history.
RetrieveHistoryCancel	I2	Cancel the retrieval of enabled history.
TimeSync	I2	Perform time synchronization.