Sorry 65gtoman, you are confusing what you wish to be true with the law. Of course, you may walk around your home with a holstered revolver. It is your domicile and you are within your rights. You may answer the door, wearing the holstered weapon, but if at any time you give even the slightest indication that you intend to withdraw the weapon, and there is no imminent threat to your safety, you are subject to assault charges.
Let's say an obnoxious pot and pan salesman comes to your door. You answer the door, wearing a holstered weapon. You tell the peddler that you don't want to buy anything and that your land and home are posted, "no solicitors." He continues his sales pitch, as though he didn't hear a word of what you said. You tell him to stop and leave. He continues his sales pitch. You reach for your gun. You can be charged with misdemeanor assault with a deadly weapon. You had no imminent threat to your person or possessions. Your recourse was solely to call the police and have the man removed. It sounds unfair, and may well be so, but it's the law.