Vaisala AQT530, Configuration Manual

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7. Troubleshooting
If the product does not work as it should, check all cables and connectors.
Check the maintenance needs.
If the failure persists, contact Vaisala technical support.
Table 38 Troubleshooting AQT530
Problem Probable cause Remedy
Measurement failure or irrelevant
data values. The settings are incorrect. Contact Vaisala technical support.
There is a hardware failure.
No response to any commands. Wiring is wrong. Check the wiring.
Operational power is not
connected. Check the operating voltage.
Baud rate or other serial property
of the device is different from the
host.
Connect the serial cable and check
the serial port settings of the
device with a terminal program.
No response to Modbus query. RS-485 wiring is wrong. Do the following:
1. Configure human-readable
ASCII CSV report, see
Configuring ASCII CSV data
sending (page 21)
.
2. Verify that ASCII CSV report is
sent every 60 s to RS-485 port.
If data is not coming through,
change the wiring of pins 5 and
6. See
M12 pinout and wiring
(page 55) .
3. Configure original Modbus
mode (Modbus RTU or
Modbus ASCII) back to the
device, see Configuring Modbus
interface (page 20) .
7.1 Writing a problem report
When troubleshooting the product, write a problem report including:
• What failed (what worked / did not work)?
• Where did it fail (location and environment)?
• When did it fail (date, immediately / after a while / periodically / randomly)?
• How many failed (only one defect / other same or similar defects / several failures in
one unit)?
• What was done when the failure was noticed?
• What was connected to the product and to which connectors?
Chapter 7 – Troubleshooting
53