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Guys I need help. I'm a HVAC controls contractor and I have a constant issue with MODBUS RTU and my ability to connect to an MODBUS capable device. I want to be able to walk up to a device, (IE Rooftop HVAC unit, Data Center UPS unit) and connect to it with my laptop and see basic things.....It it addressed correctly....is it communicating at all....can I poll a register...Can anyone help with this?