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6)
Does the Monitoring System use any non-standard data formats, e.g. inverted data? If so,
the system will not communicate correctly.
7)
Is the GND lead of the sensor shared with the GND of the Monitoring System? If either part
is driven by a completely different power supply, there may be significantly different
voltages between the two and they will not communicate. If they are commoned or either
is floating or isolated they should “float” back together. If in doubt, check with a meter
and unless there are persistently high voltages (more than a few volts) between the two,
connect the two GND lines together with a third wire, ideally with a fuse in line in case
they are driven to different voltages and not just floating apart. CHECK YOUR POWER
CONNECTION SCENARIO FIRST TO ENSURE THIS WILL NOT HARM THE SENSOR OR YOUR
EQUIPMENT.
8)
Try swapping the RS485 A and B lines over. The A line should go to the blue wire (pin 5
on the sensor connector) and the B line should go to green (pin 6) but these lines are
sometimes marked the opposite way round on the Monitoring System. (A should be the
non-inverted data line and B the inverted data line but the whole RS485 communications
system is active-low so inverted and non-inverted sometimes get confused.) This will not
cause any damage so is worth trying if all else fails!
9)
If this still does not work, please feel free to contact Tan Delta for more support;
Telephone:
+44 (0)845 094 8710
Email:
If you are receiving replies but they do not make sense….
1)
Check that you are reading the correct Register as detailed in 2) at the top of page 20.
2)
Check that you are reading in the correct number format. Most value readings are in
signed 16-bit integer decimal format and multiplied by 100, so a reading of +1234 means
+12.34 and a reading of -5678 means -56.78. If you are reading in unsigned format, any
negative values will look wrong. If you are reading in binary, octal or hexadecimal formats
the values will look very strange. Other readings are generally in simple integer format
so should be straightforward.
3)
Check that you are using the correct baud rate and number of bits as detailed in 4) at the
top of page 20. If your Monitoring System gives communications errors, check these to
see if that gives any clue.
4)
If this still does not work, please feel free to contact Tan Delta for more support;
Telephone:
+44 (0)845 094 8710
Email:
Summary of Contents for OQSExISG2
Page 1: ...UG OQSxG2 23 0025 OIL QUALITY SENSOR ASSOCIATED ACCESSORIES USER GUIDE...
Page 2: ......
Page 5: ...Page 3 Page Intentionally Blank...
Page 37: ...Page 35 Figure 19 Connection to other Tan Delta and 3rd Party Products Interfaces...
Page 38: ...Page 36 Figure 20 ExOQSxG2 Ex Sensor Installation Drawing Rev 2 STAMPED...
Page 42: ...Page 40 8 Display Express...
