Campbell Scientific HC2S3 Temperature and Relative Humidity Probe - Manual (Page 36)

Appendix C. HC2S3 Digital Communications
Command Format:
{ ID Adr RDD Chksum or } CR
Answer format:
{ ID Adr RDD Chksum or } CR
The data are returned according to the following structure:
Example Type Description
1..3 Byte Probe type (1= digital probe, 2=analog probe,
3=pressure probe)
1234.56 Float Relative humidity or analog value
%RH String Humidity or analog value engineering unit
0..1 Bool Humidity or analog value alarm (out-of-limits)
+ Char Humidity or analog value trend (+,-,= or “ “)
1234.56 Float Temperature value
°C String Temperature engineering unit
0..1 Bool Temperature alarm (out-of-limits)
= Char Temperature trend (+,-,= or “ “)
Dp String Calculated parameter type (nc: no calculation, Dp:
dew point, Fp: frost point)
1234.56 Float Calculated numerical value
°C String Calculated parameter engineering unit
0..1 Bool Calculated parameter alarm (out-of-limits)
+ Char Calculated parameter trend (+,-,= or “ “)
1..255 Byte Device type (HygroClip, Logger, HF, HM, …)
V1.0 String Firmware version
12345678 String Device serial number
Name String Device name
000…255 Byte Alarm Byte: (Bit0=out-of-limits value, Bit5= sensor
quality, Bit6 = humidity simulator, Bit7= temperature
simulator)
Example data returned from the RDD command:
{F00RDD} CR
{F00rdd 001; 4.45;%RH;000;=; 20.07;°C;000;=;nc;---.-;°C;000; ;001;V1.7-
1;0060568338;HC2-S3 ;000;4
C-2