HART superimposes FSK digital communication on a 4-20mA analog loop. Two wires carry both power and bidirectional data requiring a 250-ohm minimum load.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | Loop+ | Current loop positive 12V-42V | PWR |
| 2 | Loop- | Current loop negative | BUS |
HART superimposes FSK digital communication on a 4-20mA analog loop. Two wires carry both power and bidirectional data requiring a 250-ohm minimum load.