Hi Len, the second socket in the back of the Corus IR receiver is an input. It is used to daisy-chain two or more receivers, in case you wanted to control Corus from multiple ppoints of convenience, even though the primary receiver were out of the line of sight.
As I mentioned, the IR station does not have any battery.... It is only capable of generating very low energy digital codes that command the Corus control logic. It does not have sufficient energy to generate the 12V analog pulse required to trigger the standby/operate relay on M625. To generate the 12V pulse, the station would need a relatively hefty battery, or should have a small power supply for being powered from AC...
G.