If this is the first time use the Calmotion with the Fadal. Make sure the default baud setting on the Calmotion is also available on the Fadal. Go to SETP, the baud rate 38400 must be available in the parameter list to use the Calmotion out of the box. If the Fadal max baud rate is 9600, the Calmotion INI file must be reconfigured to use a lower baud rate. See user manual how to make a INI file for the product you have.
Make sure the SETP parameter CMD MENU or COMMAND MENUS is set to OFF or SPACE, do not use the setting of ON. If the parameter does not exist in the SETP, then ignore.
Make sure you enter the CD,# and then when back to ENTER NEXT COMMAND press only the + this will display the HELP menu. This is a great first step: