Data format in ASCII mode - AQT400

AQT400 Series User Guide

Document code
M211942EN
Revision
E
Language
English
Product
AQT400
Document type
User guide

The CSV data messages are available in the ASCII autosend mode for conveying air quality measurement data.

To use the RS-485 port in ASCII mode:

  • Set parameter rs485_mode to 0
  • Port settings: 7E1 (7 data bits, even parity, one stop bit)

In ASCII mode, the device prints CSV formatted measurements.

<dateTtime>,<temp>,<hum>,<pres>,<meas>,<conf>,<uptime>
Table 1. CSV output format fields
Field Description Example
dateTtime Date and time in ISO8601 format 2015-07-01T12:34:56
temp Air temperature in °C or °F (tempunit parameter, see Vaisala Air Quality Transmitter AQT400 Series Configuration Guide) 23.5
hum Air humidity in %RH 43.2
pres Air pressure in mbar 1011
meas

Gas measurements in ppm

Particle measurements in μg/m³

0.023,0.067,26.2,105.7
conf

Specifies the printing order of the measurements in the meas field.

Always includes T:H:P (temperature, humidity, pressure).

T:H:P:NO2:SO2:PM2.5:PM10
uptime

Device uptime in seconds.

Measurements are considered valid when uptime is more than 86400 seconds (one day).

131422

Examples of CSV messages

2017-10-31T06:55:36,22.3,14.6,1011.2,-0.003,0.039,0.196,-0.001,0.3,0.5,T:H:P:NO2:SO2:CO:O3:PM2.5:PM10,58862
2017-10-31T06:56:37,22.3,15.1,1011.1,-0.002,0.040,0.195,-0.001,0.3,0.5,T:H:P:NO2:SO2:CO:O3:PM2.5:PM10,58923
The actual message does not contain line feeds.