Measurement device and a measurement interface having a radio communications module

A measurement device, comprising:

• a measurement sensor for generating metrology data;
• and
• a frequency hopping radio communications module for transmitting and receiving a radio signal over a plurality of frequency channels,
• the frequency hopping radio communications module comprising a clock for defining a series of a base time interval, and a memory for storing a hopping pattern describing a sequence of the frequency channels,
• wherein the communications module is operable in at least a first mode, a second mode and a third mode,
• operation in the first mode comprises transmitting and/or receiving data using a series of first frames having a first frame time, the first frame time being equal to or a first integer multiple of the base time interval,
• operation in the second mode comprises transmitting and/or receiving data using a series of second frames having a second frame time, the second frame time being a second integer multiple of the first frame time,
• operation in the third mode comprises transmitting and/or receiving data using a series of third frames having a third frame time, the third frame time being a third integer multiple of the second frame time,
• the second and third integer multiples are other than one, and
• each successive base time interval of the series of the base time interval is associated with a successive frequency channel of the hopping pattern sequence, each frame of the first frames, the second frames, and the third frames using only the frequency channel associated with the base time interval that occurs at a start of that frame.