NUM="number of characters to get" (-1)
The NUM directive is the number of characters to get, -1 means to get everything up to the next CRLF pair. Using negative number for the NUM directive will get everything up to the ASCII equivalent of the absolute value of NUM. So -32 stops on a space since 32 is the ASCII code for space.
iTELNET, iTELSET, /iTELNET