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This is my Wiki for this project and information I share about what I learn from this HM310P power supply.

My decades old linear power supply went dead on me in Mar 2020 a replacement is need. It had three DC power output, but I use mostly only 2 outlet. I think of getting a smart power supply that I can program it for varies of project with either a press of a bottom, or call a program to control the output instead of having to set the dials for the project and occasionally I will made mistake and fried some circuits.

I ended up land on this HanmaTek HM-310P - a 30V 10A power supply, I have to get two to replace my original. It can be controlled through USB, but the software that come with it does not meet my need. But lucky it provide a simple doc that disclose it is using MODBUS/Serial (through FDTI USB) to control it, so creating a program for it become this project. But the document's information is highly limited.

I also later discover, the power supply has a undocumented feature that you can set varies of parameters from its interface.

What I found from its application was the setting files, that expose some additional register addresses, but then there are features that I am not able to figure out how I can set them, such as turn on/off of OVP/OCP, I can only set them, but not to enable them.