Register table - GMP231

GMP231 User Guide
Document code
M211501EN
Revision
E
Language
English
Product
GMP231
Document type
User guide
Table 1. GMP231 register table
Meaning Name ID Size in bytes Type Read/write Persistent Other
Factory information
Device address ADDR 0 1 Byte R Yes Default is 09hex.
Device serial number SNUM 1 12 Str R Yes Example: A1234567
Sensor number SSNUM 2 12 Str R Yes Example: B1234567
Component board number CBNUM 3 12 Str R Yes Example: C1234567
Software version number VERS 4 12 Str R Yes Example: 1.2.3.4567
Factory adjustment date Year ADATEY 5 2 Uint R Yes Example: 2014
Factory adjustment date Month ADATEM 6 1 Byte R Yes Example: 3
Factory adjustment date Day ADATED 7 1 Byte R Yes Example: 29
General parameters and variables
Device status word STATUS 8 4 Str R No See Status word.
CO2 measurement mode CO2_MODE 9 1 Byte R/W Yes

0 = Standby mode. Measurement and probe heating is off

1 = Measurement on

Internal logic can override this setting.
Final CO2 result CO2 10 4 Float R No ppm CO2
Raw CO2 (uncompensated, unfiltered) CO2_RAW 11 4 Float R No ppm CO2
Compensated CO2 (unfiltered) CO2_COMP 12 4 Float R No ppm CO2
CO2 measurement filtering CO2_FILT 13 1 Byte R/W Yes

Range 0 … 1

0 = no filtering

1 = filtering (default)
Sensor heating HEAT 14 1 Byte R/W Yes

Range 0…1

0 = no heating

1 = heating (default)
Compensation settings
Temperature compensation mode TC_MODE 15 1 Byte R/W Yes

0 = Compensation off

1 = Use temperature setpoint value (default)

2 = Use Internal sensor temperature
Compensation temperature T_COMP 16 4 Float R/W No Celsius
Measured temperature (internal sensor) T 17 4 Float R No Celsius
Pressure compensation mode PC_MODE 18 1 Byte R/W Yes

0 = Compensation off

1 = Use pressure setpoint value

2 = Use internal pressure sensor (default)
Compensation pressure P_COMP 19 4 Float R/W No hPa
Measured pressure (internal sensor) P 20 4 Float R No hPa
Humidity compensation mode RHC_MODE 21 1 Byte R/W Yes

0 = Compensation off

1 = Use RH setpoint value (default)
Compensation humidity RH_COMP 22 4 Float R/W No %RH
Oxygen compensation mode O2C_MODE 23 1 Byte R/W Yes

0 = Compensation off

1 = Use oxygen concentration setpoint value (default)
Compensation oxygen O2_COMP 24 4 Float R/W No %O2
Adjustment settings
Reference CO2 point 1 CO2_RP1 25 4 Float R/W Yes ppm CO2
Measured CO2 point 1 CO2_MP1 26 4 Float R Yes ppm CO2
Reference CO2 point 2 CO2_RP2 27 4 Float R/W Yes ppm CO2
Measured CO2 point 2 CO2_MP2 28 4 Float R Yes ppm CO2
Reference temperature point 1 T_RP1 29 4 Float R/W Yes Celsius 0 °C
Measured temperature point 1 T_MP1 30 4 Float R Yes Celsius 0 °C
Reference pressure point 1 PRE_RP1 31 4 Float R/W Yes 1013.25 hPa
Measured pressure point 1 PRE_MP1 32 4 Float R Yes 1013.25 hPa
Analog output settings
Analog output mode A_MODE 33 1 Byte R/W No

0 = Off (0 mA)

1 = Test mode

2 = Normal (default)

3 = Locked to latest value
Analog output test current A_TC 34 4 Float R/W No 0 … 25 mA
Analog output error state current A_EC 35 4 Float R/W Yes 0 … 25 mA
Analog output low end current A_LC 36 1 Byte R/W Yes

0 = 0 mA

1 = 4 mA
Analog output scale low (0/4 mA) A_LOW 37 4 Float R/W Yes ppm CO2
Analog output scale high (20 mA) A_HI 38 4 Float R/W Yes ppm CO2
Other
Persistent compensation values (used if volatile values are not given)
Compensation temperature T_COMP2 39 4 Float R/W Yes 37 °C (default)
Compensation pressure P_COMP2 40 4 Float R/W Yes 1013.25 hPa (default)
Compensation humidity RH_COMP2 41 4 Float R/W Yes 90 %RH (default)
Compensation oxygen O2_COMP2 42 4 Float R/W Yes 19.7 %O2 (default)