timecode systems UltraSync BLUE, User Manual

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Multiple Masters in the Same Network
You should set up your Timecode Systems devices so that there is one master
device per network (RF channel) . This ensures that all of the slave devices
synchronise with the same timecode data (the timecode of the master device).
If you have multiple masters in the same network, each slave will connect to the
first master that detects it. There is no guarantee that all of the slaves will connect
to the same master, and so you could have slaves using the wrong timecode. To
avoid this mistake, set the devices in your network to use the same unique channel.
Example: Bad Network Configuration
Let's say you have a network where all of the devices are set to use RF
Channel 4. There is one :pulse master, and three UltraSync ONE slaves.
The devices in the network are all turned off and you add a new UltraSync
ONE to the network. It is set to run in Master TX mode. When the devices are
turned back on, there are two masters in the network - the :pulse and the
new UltraSync ONE.
The slaves attempt to connect to the first master they find. Two of the slaves
connect to the :pulse master first, and so synchronise with the :pulse. The
other slave connects with the new UltraSync ONE first and so synchronises
with that. As a result, the devices in the network are not synchronised to the
same timecode.
28 UltraSync ONE User Guide