As it says in rfelease 87 Current Cost is not working. I have checked the unit on my Linux server and it works fine.
Ok here - occasionally the serial port changes - did you happen to unplug the usb lead and re-plug elsewhere? Also, try the obvious ‘connect now’…
I tried all of that it is the only USB to serial I have and has always shown up on com4 as it is now. Overnight my system pulled the latest updates from Microsoft and rebooted and it now works again odd. I did reboot it several times and did a connect now to no avail. Still it now works again.