In HART Common Tables, Table 34, several standard Device Variable Codes are defined to allow access to the process measurements and loop current historically returned in Command 3. Since these codes are standardized, they must be supported by all devices.
- 243: Battery life (Float in Days) for WirelessHART device
- 244: Percent Range
- 245: Loop Current
- 246: Primary Variable
- 247: Secondary Variable
- 248: Tertiary Variable
- 249: Quaternary Variable
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