This box has two plugs which connect to the MotionStar chassis. This is a 12V battery which is used to power the remote master.
Power is transferred through a battery clip which connects the battery to the remote master.
This component generates the tracking fields. This is a connector which attaches to the ERC XMTR port. Light Emitting Diode. Blinks on power-up, reset, or on some error conditions. This is the large black rack-mountable chassis which contains the processor and special RS232 Serial Comport boards.