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NO!This means that I can no longer achieve a serial connection, instead I can connect it all in parallell and possibly put EOL at the end of each device.
An EOL on any one of the spurs will tell the panel that all of them of fault-free, so you could remove any of the heads and it wouldn't know about it.
Can you possibly pull 4-core through on one of the cable runes using the existing 2 core, and use an 8 zone panel?