Measurement data registers - GMP251

GMP251 User Guide

Document code
M211799EN
Revision
H
Language
English
Product
GMP251
Document type
User guide
Table 1. Modbus measurement data registers (read-only)
Register number Address Description Data format Unit
1 0000hex Measured CO2 value 32-bit float ppm
3 0002hex Compensation T 32-bit float °C
5 0004hex Measured T 32-bit float °C
257 0100hex Measured CO2 value 16-bit signed integer ppm (up to 32 000 ppm)
258 0101hex Measured CO2 value 16-bit signed integer ppm1 (scaled, up to approx. 320 000 ppm)
1 The ppm output of the second Measured CO2 value register (number 258) is scaled and must be multiplied by 10.