Driver RS-232 or Centralite

[SmartHomePrimer]

Apparently a way to use an RS232 adapter here. Different use case, but maybe you can get what you need?

Looking for 12 volt DC Sensor that reports in to Hubitat

If you're open to Node-red, you can interface this voltmeter to HE. I have the modbus version for DC, accurate and fast reading, provides V & A, so W and also kWh summary in real time any cheap rs485 to rs232 will work [Peacefair node-red]