Sensor Electronics SEC Millenium Series Instruction And Operation Manual page 264

It should pause when it finds a new device, which should show either "SEC
Relay-8" or "SEC Relay-16". Note the device ID at this time. If this is the proper
device, press "Bring On-Line" when it appears, if not, press "Abort" to terminate
the search. If this process completes and it never pauses indicating a new device,
then either the device is not connected properly, or it is conflicting with another
device online.
i) If it conflicts with another device on the bus (such as an SEC 3100 that you
left attached to the bus during this time), notice that the "# Found" counter is
identical to what it was in step 2. Identifying this device can only be done by
disconnecting all devices from the bus, and deleting all devices from the
database, and changing the device ID. This is beyond the scope of this
document, if you are a "supervisor operator", refer to the Supervisor's Manual
for more advanced diagnostics and setup detail for this condition. At this point
then you must stop in this manual, and continue in the Supervisor's Manual.
c) If it was brought on-line, recall the device ID when it paused to be brought on-line
(in step 4b above). Make sure this ID is NOT at all in the range of the SEC 3100
devices noted in step 2 above (above the highest device ID). If it is conflicting, or
in that range, follow the Supervisor's Manual to change the device ID. Either way,
the Device ID should be changed since only the SEC 3500 can assign its network
ID. This should be done before proceeding to the next Relay Module device, since
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SEC 3500 OI
Startup Basics
Manual
Version 2.1.0090