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Combined Rack (CR)
The Combined Rack (CR) option enables a single DMS-3K master to manage and collect alarms
from up to 15 DMS-3K slaves in one browser window. The terminology 'master' and 'slave' should not
be confused with Modbus or DNP master/slave. In a system with several Logic Card Racks, only one
rack is typically enabled for the CR Option, although this option could be added to any unit.
The following steps should be followed when configuring a system with the CR Option.
1. Before a DMS-3K master is enabled with the CR option, you must first configure each DMS-3K
slave device with unique input numbers. The master DMS-3K will start with input number 1 and
the slave units will be numbered in succession. For example, if the master unit has 128
channels, the inputs will be numbered 1-128 and the first slave unit with 128 channels would
be numbered 129-256, etc.
Note: If the slave unit inputs are not numbered in succession or if the input numbers overlap,
the master DMS-3K will not allow you to enable the CR option.
2. Make sure that all DMS-3K units have the same firmware version. This is shown on the web
browser 'Home Page'.
3. Make sure that the TCP/IP port on the master and slave devices match. Also make sure that
this port address is unique on your network. Avoid using commonly used ones; ie <2000.
4. After all the slave units are configured with their own IP Address, same TCP/IP Port and alarm
numbering scheme described above, enter each of the slave unit's IP address on the unit with
the CR option enabled.
5. You need to remove any active alarms from the master or slave units before enabling this
feature. If you are unable to do this easily, just disable all the inputs (use the global setting on
the bottom of the Alarm Input Configuration Page).
6. Select 'Enabled (master)' and it should connect to all units.
CR Operation – Connection Status
The CR Master communicates to the DMS-3K slaves to retrieve events as they occur via Ethernet
communications. The DMS-3K slave units initiate continuous communications to the CR Master.
The colored annunciator box around the device number indicates:
White – a connection not yet attempted.
Green – a slave is connected
Red – the slave did not connect within the initial 2 minutes
Orange – a DMS-3K that was once connected, has gone off-line and is no longer
communicating to the master DMS-3K. The CR master will continue to reconnect to this unit
every 15 seconds
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