
Appendix C _________________________________________________________ Modbus Reference
VAISALA _______________________________________________________________________ 211
Status Registers (Read-Only)
Table 46 Status Registers
1 = Online data available
Bit field that represents the
error codes listed in Table 36
on page 158. Active errors are
set to 1. For example, if bit 14
is set to 1, error code E14 is
Error information can retrieved also with function code 08, sub-function
02.
NOTE
Basic status information of the
PTU300 transmitter is also available with
the Read Exception Status function code 07. For details, see section
Exception Status Outputs
on page 212.
Configuration Registers
Configuration parameter registers are used to configure the measurement.
Writing out-of-range values is silently ignored.
Table 47 Configuration Parameter Registers
Pressure setting default
value
Pressure setting
temporary value
Molecular weight for
ppm
w
calculation
Maximum pressure
difference
If you modify the pressure setting repeatedly, modify the temporary
value at register 0771...0772 (1026) instead of the permanent setting at
register 0769…0770 (1025). Set the temporary value to zero to return to
the default pressure setting.
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