Hi @bianco-royal - awesome to hear from you 
I'm just working my way through the codebase. I'm not a native javascript developer so it's not second nature to me, so may struggle to improve. It looks like there's a need to initialise and queue based on the server being used, opposed to the slave address of each modbus device.
I am definitely able to test. I have a test rig setup with 2 modbus slaves, but also have a larger remote setup with 10 slaves, all on a single serial port.
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