Vaisala GMP252 - Configuration Registers; Table 53 Modbus Configuration Data Registers (Writable); A.2.2 Configuration Registers

Register
Number
(Decimal)
Address
(Hexadecimal)
Register Description Data Format Unit
258 0101
hex
Measured CO
2
value 16-bit signed integer
ppm
1)
(scaled, up to
approx. 320 000
ppm)
1) The ppm output of the second Measured CO
2
value register (number 258) is scaled and must be multiplied by 10.
A.2.2 Configuration Registers
Default power-up values (registers 513-519) are written into non-volatile
EEPROM memory. The EEPROM memory implementation has a limit of 30000 writes,
and is intended to be used only when saving long-term or permanent
configurations. Use
the volatile memory (registers 521 … 527, values cleared on power-up) for non-
permanent
configurations (for example, if the probe is used in a system that regularly
updates the compensation values).
CAUTION!
Table 53 Modbus Configuration Data Registers (Writable)
Register
Number
(Decimal)
Address
(Hexadecimal)
Register Description Data
Format
Unit / Valid Range
513 0200
hex
Power-up value for
pressure
compensation
32-bit float hPa
700 ... 1500 hPa
Operating <1.5 bar
(Init/default: 1013.25)
515 0202
hex
Power-up value for
temperature
compensation
32-bit float °C
-40 ... +80
(Init/default: 25)
517 0204
hex
Power-up value for
humidity
compensation
32-bit float %RH
0 ... 100 %
(Init/default: 0)
519 0206
hex
Power-up value for
oxygen compensation
32-bit float %O
2
0 ... 100 %
(Init/default: 0)
521 0208
hex
Volatile (value cleared
at probe reset)
pressure
compensation
32-bit float Range 700 ... 1500 hPa
(Init copied from power-up
value)
523 020A
hex
Volatile (value cleared
at probe reset)
temperature
compensation
32-bit float Range -40 … +80 °C
(Init copied from power-up
value)
GMP252 User Guide M211897EN-D
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