****Problem Solved!****
Thank you so much for your guidance Alex.
The default baud rate of the ERC-M controller is 9600 and I tried changing it to 4800 and increasing it to 19200 to no avail.
BUT, setting it to 38400 has made all the difference. NO ERRORS and more importantly, an extremely happy Ham!
Above all, I thank you because I have learnt something new, and that doesn't happen very often these days as the grey matter slows!
TU 73 Alex de GJ6WRI Steve