The GEM-2D is a module that connects to the GEMACM1D, an accessory that adds integrated access control to the burglary alarm functions of the GEM-X255 control panel. The GEM-ACM1D provides controlled access to a door by releasing a locking device (such as a magnetic lock or electric strike) when the proper credential is presented to the card reader. The GEM-2D allows the GEM-ACM1D to independently control a second access relay using a separate card reader.