This question relates to the BLOCK_ADDRESS issue raised by Hamish before.
This is my point of view:
BLOCK_ADDRESS only makes sense when there are Sub-Devices present. There is, however, no need to suppress the BLOCK_ADDRESS PID when Sub-Devices have gone (e.g. the "empty" Dimmer Rack referred to earlier). You may assume to receive a valid address in the DMX address range. You may also be able to set (write) a Block Adress without Sub-Devices installed; but slot allocation may only take place as soon as the Sub-Devices (with their respective slot count) are added or enabled.
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