The fledge-south-usb4704 plugin is a south plugin that is designed to gather data from an Advantech USB-4704 data acquisition module. The module supports 8 digital inputs and 8 analogue inputs. It is possible to configure the plugin to combine multiple digital input to create a single numeric data point or have each input as a boolean data point. Each analogue input, which is a 14 bit analogue to digital converter, becomes a single numeric data point in the range 0 to 16383, although a scale and offset may be applied to these values.
To create a south service with the USB-4704
Click on South in the left hand menu bar
Select usb4704 from the plugin list
Name your service and click Next
Configure the plugin
Asset Name: The name of the asset that will be created with the values read from the USB-4704
Connections: A JSON document that describes the connections to the USB-4704 and the data points within the asset that they map to. The JSON document is a set of objects, one per data point. The objects contain a number of key/value pairs as follow
The type of connection, this may be either digital or analogue.
The analogue pin used for the connection.
An array of pins for a digital connection, the first element in the array becomes the most significant bit of the numeric value created.
The data point name within the asset.
An optional scale value that may be applied to the value.
Click on Next
Enable your service and click on Done