The DB25 field splice is used to connect the control cable to the SDA 100 electronic controller. The field splice consists of terminal headers that are mounted to a PCB board, which is in turn connected to a male DB25 connector. The control cable is connected to the splice using the included wiring diagram. Having the field splice allows for exact lengths of control cable, with lengths available to the nearest foot. In addition, if the cable is being run into a conduit, it eliminates the need to cut off the connector. This adapter allows for solder-less connection for the 25 pin connector on the controller.
Wiring instructions found here.