We have a device with is only communicating through RS-232 and it has its own protocol for communication.
We are looking for a developer who knows Raspberry Pi3 programming and also has experience with HEX commands over RS-232 over a USB to Serial convertor.
After Phase one, you can to work remotely on our system, because the hardware is here in our office.
We will provide you all remote access details when you can make sure of the feasibility.
Eventually, we will communicate through our iPad app, with Raspberry Pi3, and send commands from the iPad to the Register, using the Raspberry as middleware.