I’m new here and need help

I look around and found NCD and wounded if som can help me.
I have a scale how send the weight at RS232.
I will send this and also 2-3 temperature so I can read it from my computer or mobile phone.
The scale are out door and drives at 12 VDC.
Today I have a solution with Rapsbery PI that a friend have fix. But it don’t works so good. And I will have control at it t my self.
Is it some how can help me what I need?