Master and Slave
Calling one device the master and another one the slave can lead to confusion. Therefore, the timecode relationship and the machine control relationship must be differentiated and clearly defined in this regard.
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Timecode Master
The device generating position information or timecode.
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Timecode Slave
Any device receiving the timecode and synchronizing or locking to it.
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Machine Control Master
The device that issues transport commands to the system.
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Machine Control Slave
The device receiving timecode commands and responding to them.
Nuendo can be the machine control master, sending transport commands to an external device, which in turn sends timecode and audio clock information back to Nuendo. In this case, Nuendo is also the timecode slave.
In most scenarios, the machine control slave is also the timecode master. Once it receives a play command, the device starts generating timecode for all the timecode slaves to synchronize to.