Siemens SENTRON, Installation Manual

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 SENTRON 3/6 Bus Plug with Optional SEM3™ Package

  The SEM3™ controller plug (Figure 4) provides power to
   and  manages data from the SEM3™ metered bus plug 
  network. This plug is designed to accept input from a
   network containing TWO sets of "daisy chained" metered  
  bus plugs using ports R1 and R2 as shown. It is generally  
  recommended to position the controller plug at the center  
  of the metered plug network. Communication cables    
  connected to ports R1 and R2 are required to transmit    
  power and information between the "daisy chained" meter  
  plugs and the controller plug.

Note:

 The controller plug is factory constructed with

   internal metering; these meters are included in the R1    
  branch. The controller in this bus plug will aggregate inputs  
  from metered plugs and output data via the Ethernet port  
  marked PC on the front of the bus plug. 10/100BASE-T    
  port  with an RJ45 modular connector). The Ethernet port is  
  capable of data rates up to 100Mbps.

TIP: 

It is generally recommended to balance the number  

  of meter modules connected to ports 

R1 and R2 

on the  

  controller bus plugs. 

5

  Communication cables between meter plugs may be    
  connected in a "daisy chain" fashion using either RJ45 port  
  shown in Figure  3. There is no specific "input" or "output"  
  functionality to these ports on the metered plugs. However,  
  setting the rotary dial to the proper setting is required as
   described in Section 7.3. Connection of "daisy chained"   
  meter plugs to the controller plug shown in Figure 4 is    
  described next.

Figure 4: Controller Plug with Input and Output Ports

Figure 3: Metered Plug with Input and Output Ports