Arghhh. IDE was set to NL! I was reassured by the fact that the “l” command was working whilst it was running! Odd that “l” works with NL setting but “+++” during startup doesn’t. Will have a look at the code when I have a minute.
OK I have Config Mode working. Thank you. I have done a Reset of EEPROM.
I was looking at this thread (EmonTX Calibration Safety) regarding AC-AC power concurrent with USB-UART. Initially I disconnected the AC-AC charger to load the new sketch, but have left it connected subsequently.
When I disconnect USB-UART the Emontx reboots. Presumably this is normal behaviour?