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Home > Applications > Noise System Integration > RS232 Serial Interface

Interfacing and System Integration - RS232 Serial Interface

These sound level meters offer an RS232 serial output that can link in to a monitoring system or custom software. The output is in a clear text format and so easy to understand and process. The information about the communications protocol is included in the user manual.

Important: You need to order the CEL196138B interface to use the RS232 output from these meters. This interface is in the form of a short cable that connects to the meter and provides the usual 9-pin connection.

RS232 Interface

Don't forget to order the CEL196138B interface with the meter, it is an option that is not usually included. You can find it on the Parts tab on the product page, or click here  

CEL632A Logging
Sound Level Meter

CEL632A Logging  Sound Level Meter

Optional text

  • RS232 Output Option
  • Data Logging
  • Auto Timers

Optional text

More information...

CEL633A Environmental
Sound Level Meter

CEL633A Environmental  Sound Level Meter

Optional text

  • RS232 Output Option
  • Data Logging
  • Environmental Parameters

Optional text

More information...

CEL633C 1/3 Octave
Sound Level Meter

CEL633C 1/3 Octave  Sound Level Meter

Optional text

  • RS232 Output Option
  • Data Logging
  • 1/3 Octave Filters

Optional text

More information...

RS232 Output Format from CEL63x Sound Level Meters

The details of the RS232 output are covered in the CEL63x user manual (available from NoiseMeters Support web site), but here's a sample of the information available and the text/CSV format used. Please note that these transmissions happen automatically, there is no need for the controlling software or system to request them. The measurements are transmitted automatically as they become available. There is no communication from the controlling software to the meter.

Noise Profile - Output every 1 second to 1 hour depending on configuration. This is the information that is usually used to build up a graph of the noise levels over time or for a live display of the current sound level.

<PRF>,2010-06-02,23:19:45,LAeq,60.3,LAIeq,61.9,LAFmax ,69.2,LASmax,68.4,LAImax,70.2,LCpeak,103.2,LAF10,64.5,LAF50,63.2,LAF90,45.7,LAF99.9,32.4

The parameters in italics are only sent by meters with the environmental parameters.

Noise Period Result - Output every 1 minute to 24 hours. These are the periodic summaries of the sound levels and are usually used to build a picture of the background noise environment over a longer period of time.

 <PER>,2010-05-07,15:23:45,LAFmax,102.4,LAFmin,34.3,LAF90,65.4

Only the parameters selected in the instrument's menu are transmitted. In this case limited to LAFmax, LAFmin and L90. The Ln parameters are only available on meters fitted with the environmental parameters option.

Octave and 1/3 Octave Bands - Only available on meters fitted with these options, these are transmitted at the same rate as the Period Results. This sample shows a typical (and truncated!) 1/3 octave band measurement:

 <1/3 OCT LCeq>,2010-05-07,15:23:45,12.5Hz,32.3,16Hz,43.2 .... 20KHz,32.7

 

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