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1.MetOne Particle Counter Serial Description
The MetOne Particle Counter Serial driver allows the FieldServer to transfer data to and from devices over
This driver is based on a specification called “Standard Protocol FX (enhanced)” ENG110 Revision A dated 1999 by Pacific Scientific Instruments. This protocol provides an interface to Particle Counters manufactured by HACH Ultra Analytics and labeled as METONE products. Pacific Scientific Instruments is a former name of Hach.
The primary purpose of the driver is to obtain the current particle counts, but it does allow for limited control and configuration of some counter parameters. While the driver provides Client and Server emulation, the Server side of the driver is intended to support FieldServer’s Quality Assurance program and is not intended to provide complete emulation of a MetOne Counter. Thus the Server side is not fully documented and is not supported. At a customer’s request the Server side functionality can be documented and enhanced. If you are interested in this functionality, then please contact FieldServer’s sales group.
When configured as a Client the driver can start/stop a unit from sampling, change its mode, set and get sample and hold times, startup or standby a unit and retrieve its current sample value. Whenever the driver stores a sample value, it will also store a timestamp of when the record was obtained.
In the configuration of the FieldServer each device is identified by specifying its device number then the
For each configured node, each time the FieldServer sends a message to the device it will select the device (and the select the
When the current record is read from a device then the driver will store the data extracted from the response in a range of consecutive Data Array elements so that these values can be served to another protocol. Even though the record data contains a time stamp, the driver will make its own time stamp for new data. If there is no current record the driver will not update the data.
If the response is invalid in any way – invalid characters or invalid checksum the driver will ignore the message and not store any data.
Max Nodes Supported
| FieldServer mode | Nodes |
| Comments |
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| There can only be one Client node per FieldServer port. |
| Client | 1 |
| The driver can poll any number of Server nodes provided |
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| that they comply with the vendors numbering requirements |
| Server |
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| Driver as a Server is not documented or supported. Used |
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| only for QA purposes. | |
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