Question:  Can I use the Reply / Answer back key position on a Rotary V-Series panel to host a standard talk / listen key to panels / interfaces / fixed group or party-line?  Also what is the purpose of the "COM" label seen in the rotary panel key programming menu of ECS?
Answer:  The V-Series Rotary is the first of the V-series range that allows the user to remove the reply / answer back key and assign it for general use, thus providing 12 or 24 Listen and 12 or 24 Talk display pairs per panel (1RU or 2RU).  See the examples below: 





V-Series rotary panel with standard reply / answer back key programmed.





V-Series rotary panel programmed with "COM" key in place of the answer back key.  The "COM" key when placed on the rotary panel allows the user to quickly enter assignment panel mode without going into the V-Series menus.