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FLUO SENS integrated Manual
January 2013
13 Troubleshooting and Problem Solving
This chapter is intended for users and programmers. The
descriptions shall help users to solve problems and correct errors
in normal operation of the .
Error:
No response to MODBUS requests.
Cause:
MODBUS commands are being incorrectly sent.
Correction:
Implement the MODBUS-Protocols according to
standard. See example in section 10.7.
Error:
No response to MODBUS requests.
Cause:
Incorrect master interface settings.
Correction:
Set the master serial interface settings to 57600, 8, 1,
n. See test example in section 10.7.
Error:
No response to MODBUS requests.
Cause:
Incorrect MODBUS Address is being used.
Correction:
Try communication with MODBUS address „0“.
Test example in section 10.7.
Error:
No response to MODBUS requests.
Cause:
Checksum has been incorrectly calculated
Correction:
Calculate Checksum according to LRC (See section
12.1). See test example from section 13.
Error:
No power input.
Cause:
Power supply not connected.
Correction:
Check pin assignment in section 3, test and make any
necessary alterations.
Error:
No power input.
Cause:
External power source has not been switched on.
Correction:
Switch on power source.
Error:
No Communication
Cause:
Reset-wire (see section 3) is grounded.
Correction:
Examine the level of the reset wire and, if necessary,
connect via a resistor to +5V.
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