I bought both stations on the Chilean retail. Different years, and may be different distributors.
¿Would be possible to up load a different firmware?
Or may be it's a problem with the spaces on the sentences, on the post it seems you should leave a blank space between letters and numbers, but on my case I got reply only when I wrote them together.
It could be the terminal window I'm using, but I established connection and got reply from the console with the one I'm using.