Need a programmer for a communication converter - RS232 to Modbus

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Here's what I'm up to: got a battery controller that has an RS232 serial port and proprietary protocol (I got the communication specs) and on the other side I have a simple PLC that can talk Modbus (either TCP/Ethernet port or RTU/RS485) The PLC could not be set to talk to the battery controller directly (has very limited programibility) so I would like to build a communication converter that could talk to both. That converter would then be a master to the battery controller and the slave for the PLC It would be able to query one piece of data (that I need from the controller), store it in a Modbus holding register and the PLC would access it either via RS485 or (preferably) Ethernet.

First would be to figure out what hardware would work the best for this application.
If anybody can help, of course, I'd pay for it.
Thanks folks!

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The simplest hardware solution would probably be a Raspberry pi as it can handle both Ethernet and serial. Shouldn't be a difficult conversion.

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You can do it with a UNO/NANO using Hardware Port with Modbus and two pins using SoftwareSerial to communicate with the controller RS232.
MEGA is the best choice because its 4 Serial ports.

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