Example of patent: https://patents.google.com/patent/US6983196B2/en https://patents.google.com/patent/US6983196B2/en So for maintenance and fault indications.

Example of patent: https://patents.google.com/patent/US6983196B2/en https://patents.google.com/patent/US6983196B2/en So for maintenance and fault indications. Probably saves some time from someone digging up manuals for checking error codes from where ever they maybe placed or not. Also could display things like height and weight.