Stay awhile and listen
Not every temperature transmitter flags a disconnected thermocouple. An F&F MB-TC-1 case study: real Modbus register data, three sensor states, and the limit of what software can actually detect.
How to list available COM ports, send and receive raw bytes over a serial port, and test communication with an industrial device without any extra tools.
How the Flowbus protocol works in Bronkhorst mass flow controllers, message structure, parameter addressing and your first connection.
How Modbus RTU works over RS-485, frame structure with CRC, device addressing and common timing issues.
What RS-485 is, what the bus looks like, termination, grounding, USB converters and common wiring mistakes.
A collection of real problems I've hit while doing serial communication in industrial environments — what happens, why, and how to fix it.
What LOGO! is, how to program it, how to talk to it over Modbus TCP and Ethernet, and when it's the right choice instead of a bigger PLC.
What thermocouple modules are, types of thermocouples, how to read temperatures over Modbus RTU and what the registers in a typical multi-channel module mean.
How Modbus TCP works, frame structure, register types and your first connection to an industrial device.