This document is the user manual for the Unidata Model 6509 Water Level Instrument, describing the features and functionality of the product.
This manual describes the 6509X upgrade kit for the 6509B Water Level Instrument, including new electronics and SDI‑12 functionality. It outlines the instrument’s features, specifications, and the optional configuration options such as rotation direction and measurement units.
The document covers detailed installation and wiring diagrams, the six‑way DIP configuration switch settings, and full SDI‑12 command usage, including address changes and measurement commands. Revision history and contact information for Unidata are also provided.
| Power Supply Voltage | 7.5‑18.0 V |
|---|---|
| Typical Power Current | 1.4 mA |
| Low Battery Indication | ~6 V |
| Operating Temperature | -10°C to +60°C |
| Humidity Range | 0‑100% RH non‑condensing |
| SDI‑12 Interface Version | 1.3 |
| Measurement Units | mm, feet |
| Maximum Count Range | 65535 or 299999 |
Send the command aAb! where ‘a’ is the current address and ‘b’ is the new address; the instrument replies with the new address.
The default instrument address at delivery is “O”.
Use the six‑way DIP switch on the PCB; set it to CCW for counter‑clockwise or CW for clockwise rotation.