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Octagon 5066 with DOS 6.22, 485 Modbus RTU Driver
Old mini computer Octagon 5066 with DOS 6.22 OS system and the board has 485 interface. Need to develop a program to poll another device which is transmitting parameters using 485 Modbus RTU.
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Could you help me sketch a plan of action?

I have an old mini computer Octagon 5066 with DOS 6.22 OS system. The board has 485 interface. There is also another device which transmitting parameters using 485 Modbus RTU. So I need to develop a program to poll this device.

I only have some skills of programming Atmega controller in C and programming on Delphi.

So roughly speaking, is the Octagon 5066 like ordinary controller, and the approach to writing drivers is the same? Should I use the operating system DOS to get access to 485 port? As I understand it only works with the file system? Should I work with the registers of port 485 like in a ordinary controller? There is no information about 485 registers in datasheet on Octagon 5066.

Which language should I use to write driver C, C ++? Do I need an assembler?

I do not understand the structure. As I understand I will have an Autoexec.bat file consisting link to my driver. This driver periodically polls my sensor, and in a certain place of memory is the value I need. And my main program has access to this area of memory. Right?

What easy and modern program can I develop in order to master this project? The more documentation and examples the better. Maybe it will be a DOS emulator on the computer and exchanging on RS232 with the controller?

What do I need to know? Thank you in advance.