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RDM General Implementation Discussion General Discussion and questions relating to implementing RDM in a product.

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Old March 25th, 2014   #1
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Default SubDevice Required PIDs

What PID if any, is required to be supported by an SubDevice. The spec says that Supported Parameters is only required if the root has supported parameters. I would interpret the spec to mean "Required" for the root and all sub-devices. How can the controller determine which SubDevices are valid since they do not have to be consecutively numbered between 1 and Sub-device_Count? To me the would Required means each device not just the root.
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Old March 25th, 2014   #2
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This thread covers the required parameters for a Sub-Device.

To find the subdevices that exist, really all you can do is send a GET DEVICE_INFO (or other similar PID) to every sub-device starting with 1 and work your way up until you find all of the sub-devices that the responder reports. If the responder returns a NACK with NR_SUB_DEVICE_OUT_OF_RANGE, you can conclude that subdevice does not exist and move on to try the next one.

There's been some discussion of adding a PID that will retrieve a packed list of sub-devices in the future, but it doesn't exist yet.

Last edited by ericthegeek; March 25th, 2014 at 08:33 PM. Reason: (fixing a typo)
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