Stacks are always managed as one logical device.  that is the idea behind stacking switches.  However, if you look at the RME Detailed Device Report, you will notice that each switch in the stack will appear under the Chassis Information section.  That will allow you to get information like the serial number of each switch.  Other information (e.g. interface details) are merged together into one logical view.  For example, switch 1 will have interfaces numbered from 1/0/1 to 1/0/24 where as switch 2's interfaces will start at 2/0/1.