There are two LEDs on the SDI-12 Interface Cable, one Yellow LED, and one Red LED.
- The Yellow LED flashes whenever the Levelogger replies to a datalogger command on the SDI-12 network. The Yellow LED does not flash when it receives a command, only when it replies to a command.
- The Red LED flashes whenever there is a failure to read from the attached Levelogger. It also flashes if any part of the Built-In Test (BIT) fails. The BIT is executed when the SDI-12 Interface Cable is powered up, or after the user executes the BIT with the Start Verification Command (aV!). See Table 5-1 for a description of the BIT.
- When the SDI-12 Interface Cable is powered up, both the Red and Yellow LEDs flash once together at the same time, to indicate that unit has received power and the firmware is starting up (this process only takes 1-2 seconds).
- If communication with the Levelogger has failed or the Levelogger has been disconnected from the SDI-12 Interface Cable, and commands are being sent to the SDI-12 Interface Cable by the SDI-12 datalogger, the Red LED will flash indicating an error.
To check if the Built-In Test (BIT) has failed, see Section 5.10 for details.
If the Red LED flashes, check the following:
- The Levelogger is properly connected to the Direct Read Cable and that the Direct Read Cable is properly attached to the SDI-12 Interface Cable, at the surface.
- The three wires from the SDI-12 Interface Cable are properly connected to the SDI-12 datalogger/network (see Table 1-1).
- The voltage being supplied to the SDI-12 Interface Cable is correct (should be 12V DC).
- The BIT may have failed. If this is not corrected by doing any of the above, the user should contact Solinst directly.
- If the red LED flashes during a measurement being taken from the Levelogger, retry the measurement first, then check all connections and the voltage.