The external hardware is decribed by means of a configuration file in JSON format. Every available hardware must be grouped into device, subdevice and channel. A device could be a data acquisition card, an external FPGA, or a pointing device such as a mouse. The subdevice denotes a certain function such as a group of digital-to-analog outputs or a bank of digital inputs. Finally, a channel is one of such a group of inputs or outputs.
Let's consider a first example

{
  "device0": {
    "library": "libcomedieeros.so",
      "devHandle": "/dev/comedi0",
      "subdevice1": {
        "type": "DigIn",
        "channel0": {
          "signalId": "emergency"
          "inverted": true
        }
      },
      "subdevice5": {
        "type": "AnalogOut",
        "channel0": {
          "signalId": "aOut0",
          "scale": [ { "id" :    "aOut0",
                       "minIn":      0, "maxIn":  65535,
                       "minOut": -10.0, "maxOut":  10.0 },
                   ],
          "range": [ { "id" :   "aOut0",
                       "minIn":      0, "maxIn":  65536,
                       "minOut": -10.0,	"maxOut":  10.0 },
                   ],
          "unit": "A"
        }
      }
    }
  }
}