Add A Keypad To An HID Reader

I have an HID mullion mount reader that a customer wants to add a keypad to. Our techs have tried a few different other manufacturers but none seem to work properly. All of them send out a 26 bit facility code. Now I am almost positive years ago you could add a plain 8 bit keypad in parallel to an HID reader and then set a system up for card and pin or card or pin. I know I have done this with bio-metric units as well. Or at least my fading memory says I have or I may just be on the start of going stupid. Any suggestions for this would be great.

A little background on this topic. The reason for the mullion mount is that next to the door is textured decorative brick. We could use a grinder and carve out a section for a standard card/keypad reader but we would rather not do that. Even if we do go that route I still want to know if my memory of adding a keypad in conjunction with a reader is right or not.

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