So not exactly a 2 car group, and not quite a Miprom 21. So an at floor hall call should make DO10 output go high. DO17 the door closed limit input should be Hi, and the also DO3 input, when sitting with the doors closed. Is the operator a MAC 104 board? Is there some kind of door zone relay left from Dover? If there is a common panel on this? If so, there is are inputs called UP and DN to pilot an at floor door open. Good Luck.