This is the physical slot position of the unit in the shelf. The slots are numbered from 01 to 12 in each shelf. The first shelf in the group is shelf 00. The next shelf in the chain is shelf 01. This pattern continues to the maximum value of 15.
All connected shelves have the same group number.
Choose the slot number of the card you wish to send a command to using the command-line interface. Enter the log-in sequence as shown below. You should now see the Main Menu of the selected plug-in unit.