Appendix A. MODBUS RTU/TCP Communications
16
Aurora H2O User’s Manual
A.1 Modbus System Status Codes
Table 8
below lists the
System Status
codes and descriptions. It is possible for multiple status codes to be present.
The hexadecimal values represent the bit set for a given condition.
Status
Description
0x00000000
Aurora H2O
is operating normally, no faults or other indications.
0x00000008
Aurora H2O
is reading moisture, but cannot detect the presence of methane.
0x00000010
The moisture level is below the system detection limits.
0x00000020
The temperature inside the electronics module exceeds 85°C. The laser is powered off until the
temperature drops below 80°C.
0x00000040
The temperature transducer is operating out of limits, is disconnected, or has failed.
0x00000080
The internal (sample) pressure transducer is operating out of limits, is disconnected, or has
failed.
0x00000100
The external (line) pressure transmitter is operating out of limits, is disconnected, or has failed.
Occurs if source of the line pressure measurement is set to “Live”, and no pressure transmitter
is attached.
0x00000200
Power supply under voltage
0x00000400
System ground fault
0x00000800
The temperature of the laser is not stable. This warning occurs briefly at power on, as the
Aurora H2O
sets the correct operating temperature. The laser is powered off until the
temperature has stabilized.
0x00001000
Aurora H2O
has reached the limit for adjusting the signal gain. Contact the factory for
assistance.
0x00002000
Aurora H2O
has reached the limit for adjusting the laser power. Contact the factory for
assistance.
0x00004000
Aurora H2O
could not detect any signal from the laser. Contact the factory for assistance.
0x00010000
Aurora H2O
could not detect a signal returned from the sample cell, or the signal is below
allowed limits. Check the mirror for contamination.
0x00020000
Aurora H2O
has detected a failure in the laser temperature control. Contact the factory for
assistance.
0x00040000
The pressure in the
Aurora H2O
sample cell is greater than 212 kPa (30.75 psia). Verify regulator
and flow settings; check for blocked vent line or excessive back pressure.
0x00000000
The
Aurora H2O
temperature controller is was set beyond its operating limits. Contact the
factory for assistance.
0x1yyyzzzz
Extended Error Code
Summary of Contents for Aurora H2O
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