| Pin | Definition | Description |
|---|---|---|
| 1 | Valve control | Solenoid-valve control pin. Open: normal valve control. Grounded: forced closed. Connected to supply voltage: forced purge. |
| 2 | Flow feedback | Output is available only in analog mode. Select either 0–5V or 4–20mA. Default: 0–5V output, configured before shipment. |
| 3 | Power supply | Positive supply terminal; 9–36VDC for single-supply operation. |
| 4 | Signal ground / 485+ | Analog models: control signal ground. Digital models: 485+. |
| 5 | Not used | Inactive. |
| 6 | Flow setpoint | Active only in analog mode. Select either 0–5V or 4–20mA. Default: 0–5V input, configured before shipment. |
| 7 | Power ground | Power-supply ground. |
| 8 | Control signal ground | Control signal ground. |
| 9 | 485− | Digital models: 485−. |